JP2000196536A - WDM bidirectional optical transmission system - Google Patents
WDM bidirectional optical transmission systemInfo
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- JP2000196536A JP2000196536A JP10372610A JP37261098A JP2000196536A JP 2000196536 A JP2000196536 A JP 2000196536A JP 10372610 A JP10372610 A JP 10372610A JP 37261098 A JP37261098 A JP 37261098A JP 2000196536 A JP2000196536 A JP 2000196536A
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- optical
- light
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- modulated light
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、局側装置（ＯＳ
Ｕ）と光源をもたないユーザ装置（ＯＮＵ）との間で光
信号を双方向伝送する波長多重双方向光伝送システムに
関する。The present invention relates to an optical line terminal (OS).
The present invention relates to a wavelength-division multiplexed bidirectional optical transmission system that bidirectionally transmits an optical signal between U) and a user equipment (ONU) having no light source.
【０００２】[0002]
【従来の技術】図１２は、従来の双方向光伝送システム
の構成例を示す（特開平６−３５０５６６号公報）。こ
こで、λ1,1 ，λ1,2 ，…，λ1,n は、単一の波長帯λ
1 に属する波長であり、各波長がｎ個のユーザ装置にそ
れぞれ割り当てられる。2. Description of the Related Art FIG. 12 shows an example of the configuration of a conventional bidirectional optical transmission system (Japanese Patent Laid-Open No. 6-350566). Here, λ1,1, λ1,2,..., Λ1, n is a single wavelength band λ
1, and each wavelength is assigned to each of the n user devices.
【０００３】局側装置（ＯＳＵ）５０の送信部５１から
送信される波長λ1,1 ，λ1,2 ，…，λ1,n の光信号
は、光ファイバ伝送路６１を介して波長ルータ６０に伝
送される。波長ルータ６０では波長ルーティングを行う
ことにより、複数のユーザ装置（ＯＮＵ）７０−１〜７
０−ｎに対してそれぞれ対応する波長の光信号を分波し
て伝送する。An optical signal having a wavelength of λ1,1, λ1,2,..., Λ1, n transmitted from a transmitting unit 51 of an optical line terminal (OSU) 50 is transmitted to a wavelength router 60 via an optical fiber transmission line 61. Is done. The wavelength router 60 performs wavelength routing, thereby providing a plurality of user devices (ONUs) 70-1 to 70-7.
Optical signals having wavelengths corresponding to 0-n are demultiplexed and transmitted.
【０００４】例えば、波長ルータ６０の出力ポートｃに
は波長λ1,1 の光信号が分波され、光ファイバ伝送路６
１を介してＯＮＵ７０−１に伝送される。ＯＮＵ７０−
１に入力された光信号は光カプラ７１で２分岐され、そ
の一方が光受信器７２に受信され、他方が光変調器７３
で変調され、上り信号として光ファイバ伝送路６２およ
び波長ルータ６０を介してＯＳＵ５０の受信部５２まで
伝送される。他のＯＮＵとの光信号の送受信についても
同様である。For example, an optical signal having a wavelength λ1,1 is demultiplexed to an output port c of a wavelength router 60,
1 is transmitted to the ONU 70-1. ONU70-
The optical signal input to 1 is split into two by an optical coupler 71, one of which is received by an optical receiver 72 and the other is an optical modulator 73.
And transmitted as an upstream signal to the receiving unit 52 of the OSU 50 via the optical fiber transmission line 62 and the wavelength router 60. The same applies to transmission and reception of optical signals with other ONUs.
【０００５】本システムでは、ＯＳＵと各ＯＮＵとの間
で送受信される下り信号と上り信号は、各ＯＮＵごとに
同一の波長が割り当てられる構成である。そのため、Ｏ
ＳＵは、図１３(a) に示すように下り信号と異なるタイ
ムスロットで無変調光を送信し、各ＯＮＵがその無変調
光を変調して折り返すか、図１３(b) に示すように各Ｏ
ＮＵが下り信号から搬送波成分を抽出し、変調して折り
返す構成がとられる。[0005] In this system, the same wavelength is assigned to each ONU for the downstream signal and the upstream signal transmitted and received between the OSU and each ONU. Therefore, O
The SU transmits unmodulated light in a time slot different from that of the downlink signal as shown in FIG. 13 (a), and each ONU modulates and returns the unmodulated light, or as shown in FIG. O
A configuration is adopted in which the NU extracts a carrier component from the downlink signal, modulates and returns it.
【０００６】[0006]
【発明が解決しようとする課題】従来の双方向光伝送シ
ステムは、各ＯＮＵごとに下り信号と上り信号に同一波
長を割り当てているので、ＯＳＵから各ＯＮＵに上り信
号用の無変調光を送信するために伝送効率が低下した
り、下り信号から信号成分と上り信号用の搬送波成分を
分離抽出するための構成が複雑になる問題点があった。In the conventional bidirectional optical transmission system, since the same wavelength is assigned to the downstream signal and the upstream signal for each ONU, unmodulated light for the upstream signal is transmitted from the OSU to each ONU. Therefore, there is a problem that transmission efficiency is reduced, and a configuration for separating and extracting a signal component and a carrier component for an upstream signal from a downstream signal becomes complicated.
【０００７】本発明は、局側装置（ＯＳＵ）と光源をも
たないユーザ装置（ＯＮＵ）との間において、簡単な構
成で伝送効率を低下させることなく光信号を双方向伝送
する波長多重双方向光伝送システムを提供することを目
的とする。The present invention provides both wavelength multiplexing for bidirectional transmission of optical signals between an optical line terminal (OSU) and a user equipment (ONU) having no light source with a simple configuration without reducing transmission efficiency. An object is to provide an optical transmission system.
【０００８】[0008]
【課題を解決するための手段】本発明の波長多重双方向
光伝送システムは、局側装置（ＯＳＵ）と光源をもたな
い複数のユーザ装置（ＯＮＵ）との間を波長ルータおよ
び光ファイバ伝送路を介して接続し、局側装置は各ユー
ザ装置への下り信号として変調光および無変調光を送信
し、各ユーザ装置は変調光を受信し、無変調光を変調し
て上り信号として送信する双方向光伝送システムにおい
て、下り信号用および上り信号用としてそれぞれ１つま
たは複数の異なる波長帯を割り当て、各ユーザ装置に下
り信号用および上り信号用として各波長帯の中からそれ
ぞれ異なる波長を割り当てる。SUMMARY OF THE INVENTION A wavelength multiplexing bidirectional optical transmission system according to the present invention comprises a wavelength router and an optical fiber transmission system between an optical network unit (OSU) and a plurality of user equipments (ONUs) having no light source. Connected via a channel, the station-side device transmits modulated light and unmodulated light as a downlink signal to each user device, and each user device receives the modulated light, modulates the unmodulated light and transmits it as an uplink signal In a bidirectional optical transmission system, one or a plurality of different wavelength bands are respectively allocated for a downlink signal and an uplink signal, and different wavelengths are respectively assigned to user devices from among the respective wavelength bands for a downlink signal and an uplink signal. assign.
【０００９】局側装置は、下り信号用として割り当てた
１つまたは複数の波長帯の変調光を送信し、上り信号用
として割り当てた１つまたは複数の波長帯の無変調光を
送信する送信部と、上り信号用として割り当てた１つま
たは複数の波長帯の変調光を受信する受信部とを備え
る。[0009] The optical line terminal transmits modulated light of one or more wavelength bands allocated for downlink signals and transmits unmodulated light of one or more wavelength bands allocated for uplink signals. And a receiving unit that receives modulated light in one or a plurality of wavelength bands allocated for uplink signals.
【００１０】ユーザ装置は、受信した変調光を波長帯ご
とに分波する光波長帯フィルタと、光波長帯フィルタで
分波された下り信号用の１つまたは複数の波長の変調光
を受信する１つまたは複数の光受信器と、光波長帯フィ
ルタで分波された上り信号用の１つまたは複数の波長の
無変調光を変調する１つまたは複数の光変調器とを備え
る。[0010] The user apparatus receives an optical wavelength band filter for demultiplexing the received modulated light for each wavelength band, and receives modulated light of one or more wavelengths for a downstream signal, which is demultiplexed by the optical wavelength band filter. The apparatus includes one or more optical receivers and one or more optical modulators that modulate unmodulated light of one or more wavelengths for an upstream signal demultiplexed by an optical wavelength band filter.
【００１１】[0011]
【発明の実施の形態】（第１の実施形態）図１は、本発
明の第１の実施形態を示す。本実施形態は、下り信号用
として１つの波長帯λ1 を割り当て、上り信号用として
１つの波長帯λk （≠λ1)を割り当て、さらに波長帯λ
1 の波長λ1,1 〜λ1,n および波長帯λk の波長λk,1
〜λk,n をそれぞれ各ユーザ装置に割り当てる例を示
す。(First Embodiment) FIG. 1 shows a first embodiment of the present invention. In the present embodiment, one wavelength band λ1 is allocated for a downstream signal, one wavelength band λk (≠ λ1) is allocated for an upstream signal, and
1, wavelength λ1,1 to λ1, n and wavelength λk, 1 of wavelength band λk
An example in which ~ λk, n are respectively assigned to user devices will be described.
【００１２】局側装置（ＯＳＵ）１０と複数のユーザ装
置（ＯＮＵ）３０−１〜３０−ｎが、波長ルータ２０、
上りの光ファイバ伝送路２１、下りの光ファイバ伝送路
２２を介して接続される構成は従来と同様である。本実
施形態のＯＳＵ１０の送信部１１は、波長帯λ1 の変調
光と波長帯λk の無変調光を波長多重して光ファイバ伝
送路２１に送信する。波長ルータ２０は、波長帯λ1 の
変調光と波長帯λk の無変調光をそれぞれ分波し、波長
λ1,1 〜λ1,n の変調光および波長λk,1 〜λk,n の無
変調光をそれぞれ対応するＯＮＵ３０−１〜３０−ｎに
送出する。各ＯＮＵ３０−１〜３０−ｎは、それぞれ波
長λ1,1 〜λ1,n の変調光を受信し、波長λk,1 〜λk,
n の無変調光を変調して上り信号として送信する。波長
λk,1 〜λk,n の変調光は、波長ルータ２０および上り
の光ファイバ伝送路２２を介してＯＳＵ１０の受信部１
４に伝送される。An optical line terminal (OSU) 10 and a plurality of user units (ONUs) 30-1 to 30-n are connected to a wavelength router 20,
The configuration of connection via the upstream optical fiber transmission line 21 and the downstream optical fiber transmission line 22 is the same as the conventional one. The transmission unit 11 of the OSU 10 according to the present embodiment wavelength-multiplexes the modulated light in the wavelength band λ1 and the unmodulated light in the wavelength band λk and transmits the multiplexed light to the optical fiber transmission line 21. The wavelength router 20 separates the modulated light in the wavelength band λ1 and the unmodulated light in the wavelength band λk, respectively, and converts the modulated light in the wavelengths λ1,1 to λ1, n and the unmodulated light in the wavelengths λk, 1 to λk, n. The data is sent to the corresponding ONUs 30-1 to 30-n. Each of the ONUs 30-1 to 30-n receives the modulated light having the wavelength λ1,1 to λ1, n, respectively, and outputs the wavelength λk, 1 to λk,
n is modulated and transmitted as an uplink signal. The modulated light having the wavelengths λk, 1 to λk, n is transmitted to the receiving unit 1 of the OSU 10 through the wavelength router 20 and the upstream optical fiber transmission line 22.
4 is transmitted.
【００１３】図２は、第１の実施形態におけるＯＳＵ１
０の構成例を示す。ＯＳＵ１０の送信部１１は、波長帯
λ1 の変調光を送信する多波長光源１２−１と、波長帯
λkの無変調光を送信する多波長光源１２−ｋと、各波
長帯の変調光および無変調光を波長多重して送信する光
波長帯フィルタ（合波器）１３とにより構成される。Ｏ
ＳＵ１０の受信部１４は、波長帯λk の変調光を受信す
る光受信器１５により構成される。FIG. 2 shows the OSU 1 according to the first embodiment.
0 shows a configuration example. The transmission unit 11 of the OSU 10 includes a multi-wavelength light source 12-1 for transmitting the modulated light in the wavelength band λ1, a multi-wavelength light source 12-k for transmitting the unmodulated light in the wavelength band λk, An optical wavelength band filter (combiner) 13 for wavelength-multiplexing and transmitting the modulated light is configured. O
The receiving unit 14 of the SU 10 includes an optical receiver 15 that receives the modulated light in the wavelength band λk.
【００１４】図３は、第１の実施形態におけるＯＮＵ３
０−ｉ（ｉは１〜ｎ）の構成例を示す。なお、ＯＮＵ３
０−１〜３０−ｎはすべて同一構成である。ＯＮＵ３０
−ｉには、波長ルータ２０によって波長帯λ1 の変調光
および波長帯λk の無変調光のうち、波長λ1,i の変調
光および波長λk,i の無変調光が入力される。光波長帯
フィルタ（分波器）３１は、入力光を波長帯ごとに分波
する機能を有し、波長λ1,i の変調光および波長λk,i
の無変調光は光受信器３２および光変調器３３にそれぞ
れ分波される。光受信器３２は波長λ1,i の変調光を受
信して下り信号を検出し、光変調器３３は波長λk,i の
無変調光を上り信号で変調して送信する。FIG. 3 shows the ONU 3 in the first embodiment.
An example of the configuration of 0-i (i is 1 to n) is shown. In addition, ONU3
0-1 to 30-n all have the same configuration. ONU30
The modulated light of the wavelength λ1, i and the unmodulated light of the wavelength λk, i of the modulated light of the wavelength band λ1 and the unmodulated light of the wavelength band λk are input to −i by the wavelength router 20. The optical wavelength band filter (demultiplexer) 31 has a function of demultiplexing the input light for each wavelength band, and modulates the wavelength λ1, i and the wavelength λk, i.
Is modulated by the optical receiver 32 and the optical modulator 33, respectively. The optical receiver 32 receives the modulated light having the wavelength λ1, i and detects the downstream signal, and the optical modulator 33 modulates the unmodulated light having the wavelength λk, i with the upstream signal and transmits the modulated signal.
【００１５】（第２の実施形態）図４は、本発明の第２
の実施形態を示す。本実施形態は、下り信号用として波
長帯λ1 〜λk-1 を割り当て、上り信号用として波長帯
λk 〜λm を割り当て、さらに各波長帯λj （ｊは１〜
ｍ）の波長λj,1 〜λj,n をそれぞれ各ＯＮＵに割り当
てる例を示す。(Second Embodiment) FIG. 4 shows a second embodiment of the present invention.
An embodiment will be described. In this embodiment, wavelength bands λ1 to λk-1 are assigned for downlink signals, wavelength bands λk to λm are assigned for uplink signals, and each wavelength band λj (j is 1 to 1).
An example in which wavelengths λj, 1 to λj, n of m) are assigned to respective ONUs will be described.
【００１６】ＯＳＵ１０と複数のＯＮＵ３０−１〜３０
−ｎが、波長ルータ２０、上りの光ファイバ伝送路２
１、下りの光ファイバ伝送路２２を介して接続される構
成は第１の実施形態と同様である。本実施形態のＯＳＵ
１０の送信部１１は、波長帯λ1 〜λk-1 の変調光と波
長帯λk 〜λm の無変調光を波長多重して光ファイバ伝
送路２１に送信する。波長ルータ２０は、波長帯λ1 〜
λk-1 の変調光と波長帯λk 〜λm の無変調光をそれぞ
れ分波し、波長λ1,i 〜λk-1,i の変調光および波長λ
k,i 〜λm,i の無変調光をＯＮＵ３０−ｉに送出する
（ｉ＝１〜ｎ）。OSU 10 and a plurality of ONUs 30-1 to 30-30
-N is the wavelength router 20, the upstream optical fiber transmission line 2
1. The configuration of connection via the downstream optical fiber transmission line 22 is the same as that of the first embodiment. OSU of this embodiment
The transmitting unit 11 wavelength-multiplexes the modulated light in the wavelength bands λ1 to λk-1 and the unmodulated light in the wavelength bands λk to λm and transmits the multiplexed light to the optical fiber transmission line 21. The wavelength router 20 has a wavelength band λ1
The modulated light of λk-1 and the unmodulated light of wavelength bands λk to λm are respectively demultiplexed, and the modulated light of wavelengths λ1, i to λk-1, i and the wavelength λ
The unmodulated light of k, i to λm, i is transmitted to the ONU 30-i (i = 1 to n).
【００１７】ＯＮＵ３０−１は、波長λ1,1 〜λk-1,1
の変調光を受信し、波長λk,1 〜λm,1 の無変調光を変
調して上り信号として送信する。ＯＮＵ３０−２は、波
長λ1,2 〜λk-1,2 の変調光を受信し、波長λk,2 〜λ
m,2 の無変調光を変調して上り信号として送信する。以
下同様に、ＯＮＵ３０−ｎは、波長λ1,n 〜λk-1,nの
変調光を受信し、波長λk,n 〜λm,n の無変調光を変調
して上り信号として送信する。各ＯＮＵ３０−ｉから送
信される波長λk,i 〜λm,i の変調光は、波長ルータ２
０および上りの光ファイバ伝送路２２を介してＯＳＵ１
０の受信部１４に伝送される。The ONU 30-1 has wavelengths λ1,1 to λk-1,1.
, And modulates unmodulated light of wavelengths λk, 1 to λm, 1 and transmits it as an upstream signal. The ONU 30-2 receives the modulated lights of the wavelengths λ1,2 to λk-1,2 and outputs the wavelengths λk, 2 to λk-1,2.
m, 2 unmodulated light is modulated and transmitted as an uplink signal. Similarly, the ONU 30-n receives the modulated light having the wavelength λ1, n to λk-1, n, modulates the unmodulated light having the wavelength λk, n to λm, n, and transmits the modulated signal as an upstream signal. The modulated light of wavelengths λk, i to λm, i transmitted from each ONU 30-i is
0 and the OSU 1 via the upstream optical fiber transmission line 22.
0 is transmitted to the receiving unit 14.
【００１８】図５は、第２の実施形態におけるＯＳＵ１
０の構成例を示す。ＯＳＵ１０の送信部１１は、波長帯
λ1 〜λk-1 の変調光を送信する多波長光源１２−１〜
１２−（ｋ−１）と、波長帯λk 〜λm の無変調光を送
信する多波長光源１２−ｋ〜１２−ｍと、各波長帯の変
調光および無変調光を波長多重して送信する光波長帯フ
ィルタ（合波器）１３とにより構成される。ＯＳＵ１０
の受信部１４は、波長帯λk 〜λm の変調光を波長帯ご
とに分波する光波長帯フィルタ（分波器）１６と、波長
帯λk 〜λm の変調光を受信する光受信器１５−ｋ〜１
５−ｍにより構成される。FIG. 5 shows the OSU 1 according to the second embodiment.
0 shows a configuration example. The transmitting unit 11 of the OSU 10 includes multi-wavelength light sources 12-1 to 12-1 that transmit modulated light in the wavelength bands λ1 to λk-1.
12- (k-1), multi-wavelength light sources 12-k to 12-m for transmitting unmodulated light in the wavelength bands λk to λm, and multiplex and transmit modulated light and unmodulated light in each wavelength band. An optical wavelength band filter (combiner) 13 is provided. OSU10
Of the optical wavelength band filter (demultiplexer) 16 for demultiplexing the modulated light of the wavelength band λk to λm for each wavelength band, and the optical receiver 15-for receiving the modulated light of the wavelength band λk to λm. k-1
5-m.
【００１９】図６は、第２の実施形態におけるＯＮＵ３
０−ｉ（ｉは１〜ｎ）の構成例を示す。なお、ＯＮＵ３
０−１〜３０−ｎはすべて同一構成である。ＯＮＵ３０
−ｉには、波長ルータ２０によって波長帯λ1 〜λk-1
の変調光および波長帯λk 〜λm の無変調光のうち、波
長λ1,i 〜λk-1,i の変調光および波長λk,i 〜λm,i
の無変調光が入力される。光波長帯フィルタ（分波器）
３１は、入力光を波長帯ごとに分波する機能を有し、波
長λ1,i 〜λk-1,i の変調光は光受信器３２−１〜３２
−(ｋ−１)に分波され、波長λk,i 〜λm,i の無変調光
は光変調器３３−ｋ〜３３−ｍに分波される。光受信器
３２−１〜３２−(ｋ−１)は波長λ1,i〜λk-1,i の変
調光を受信して下り信号を検出し、光変調器３３−ｋ〜
３３−ｍは波長λk,i 〜λm,i の無変調光を上り信号で
変調して送信する。FIG. 6 shows the ONU 3 in the second embodiment.
An example of the configuration of 0-i (i is 1 to n) is shown. In addition, ONU3
0-1 to 30-n all have the same configuration. ONU30
For -i, the wavelength bands λ1 to λk-1
Of the modulated light and the unmodulated light of the wavelength band λk to λm, the modulated light of the wavelength λ1, i to λk-1, i and the wavelength λk, i to λm, i
Is input. Optical wavelength band filter (demultiplexer)
Reference numeral 31 has a function of demultiplexing the input light for each wavelength band, and the modulated lights of the wavelengths λ1, i to λk-1, i are used as optical receivers 32-1 to 32.
− (K−1), and the unmodulated light having the wavelengths λk, i to λm, i is demultiplexed to the optical modulators 33-k to 33-m. The optical receivers 32-1 to 32- (k-1) receive the modulated lights of the wavelengths λ1, i to λk-1, i, detect the downstream signals, and
33-m modulates unmodulated light of wavelengths λk, i to λm, i with an upstream signal and transmits the modulated light.
【００２０】なお、ＯＳＵ１０の光波長帯フィルタ（合
波器）１３とＯＮＵ３０−ｉの光波長帯フィルタ（分波
器）３１、ＯＳＵ１０の光波長帯フィルタ（分波器）１
６とＯＮＵ３０−ｉの光波長帯フィルタ（合波器）３４
は、それぞれ同一の波長帯の光を合分波する構成であ
る。ここで、下り信号用および上り信号用としてそれぞ
れ割り当てられる各波長帯と、各ＯＮＵ３０−１〜３０
−ｎに割り当てられる各波長の関係を図７に示す。破線
で示す帯域は、光波長帯フィルタ１３，３１，１６，３
４で合分波される各波長帯を示す。ここに示すように、
各ＯＮＵの光波長帯フィルタ３１，３４は、それぞれ同
一の合分波機能を有するものを使用することができる。The optical wavelength band filter (demultiplexer) 13 of the OSU 10, the optical wavelength band filter (demultiplexer) 31 of the ONU 30-i, and the optical wavelength band filter (demultiplexer) 1 of the OSU 10
6 and optical wavelength band filter (combiner) 34 of ONU 30-i
Are configured to multiplex / demultiplex light in the same wavelength band. Here, each wavelength band respectively assigned for the downlink signal and the uplink signal, and each ONU 30-1 to 30
FIG. 7 shows the relationship between the wavelengths assigned to −n. The bands indicated by broken lines are the optical wavelength band filters 13, 31, 16, 3
4 shows each wavelength band to be multiplexed / demultiplexed. As shown here,
As the optical wavelength band filters 31 and 34 of each ONU, those having the same multiplexing / demultiplexing function can be used.
【００２１】ＯＳＵ１０の多波長光源１２−ｊ（ｊは１
〜ｍ）は、各ＯＮＵ３０−１〜３０−ｎに対して波長λ
j,1 〜λj,n の変調光または無変調光を時分割で出力
し、光波長帯フィルタ１３で合波して送信する。ここ
で、それぞれの波長帯が異なっているので、図８に示す
ように、下り信号用の波長帯λ1 〜λk-1 の変調光と、
上り信号用の波長帯λk 〜λm の無変調光を同時に送信
することができる。これにより伝送効率を高め、等価的
に伝送速度を高めることができる。The multi-wavelength light source 12-j of the OSU 10 (j is 1
To m) indicate the wavelength λ for each of the ONUs 30-1 to 30-n.
The modulated light or unmodulated light of j, 1 to λj, n is output in a time division manner, multiplexed by the optical wavelength band filter 13, and transmitted. Here, since the respective wavelength bands are different, as shown in FIG. 8, the modulated light in the wavelength bands λ1 to λk-1 for the downlink signal,
Unmodulated light in the wavelength bands λk to λm for upstream signals can be transmitted simultaneously. Thereby, the transmission efficiency can be increased, and the transmission speed can be equivalently increased.
【００２２】（第３の実施形態）図９は、本発明の第３
の実施形態を示す。第１および第２の実施形態は、上り
の光ファイバ伝送路２１と下りの光ファイバ伝送路２２
を個別に設けた例を示したが、１本の光ファイバ伝送路
を双方向に用いることも可能であり、これを第３の実施
形態として示す。下り信号用および上り信号用に割り当
てる波長帯、および各ユーザ装置に割り当てる波長は第
２の実施形態と同様とする。(Third Embodiment) FIG. 9 shows a third embodiment of the present invention.
An embodiment will be described. In the first and second embodiments, an upstream optical fiber transmission line 21 and a downstream optical fiber transmission line 22
Are provided individually, but it is also possible to use one optical fiber transmission line bidirectionally, and this is shown as a third embodiment. The wavelength bands assigned for the downlink signal and the uplink signal and the wavelength assigned to each user device are the same as in the second embodiment.
【００２３】ＯＳＵ１０とＯＮＵ３０−１〜３０−ｎと
の間を伝送される変調光および無変調光は、光ファイバ
伝送路２３および波長ルータ２０を介して行われるが、
下り信号と上り信号の分離に光サーキュレータ２４が用
いられる。ＯＳＵ１０およびＯＮＵ３０−１〜３０−ｎ
の構成は、図５，６に示す第２の実施形態のものと同様
である。The modulated light and the unmodulated light transmitted between the OSU 10 and the ONUs 30-1 to 30-n are transmitted through the optical fiber transmission line 23 and the wavelength router 20.
The optical circulator 24 is used for separating the downstream signal and the upstream signal. OSU10 and ONU30-1 to 30-n
Is similar to that of the second embodiment shown in FIGS.
【００２４】（第４の実施形態）図１０は、本発明の第
４の実施形態を示す。本実施形態の特徴は、ＯＳＵ１０
の送信部１７が波長帯λ1 〜λk-1 の変調光および波長
帯λk 〜λm の無変調光をそれぞれ波長多重し、光ファ
イバ伝送路２１−１，２１−２に個別に送信するところ
にある。(Fourth Embodiment) FIG. 10 shows a fourth embodiment of the present invention. The feature of this embodiment is that the OSU 10
Is a wavelength multiplexing of the modulated light in the wavelength bands λ1 to λk-1 and the unmodulated light in the wavelength bands λk to λm, and individually transmits the multiplexed light to the optical fiber transmission lines 21-1 and 21-2. .
【００２５】図５に示す第２の実施形態におけるＯＳＵ
１０の送信部１１は、波長帯λ1 〜λk-1 の変調光およ
び波長帯λk 〜λm の無変調光を光波長帯フィルタ（合
波器）１３で一括して合波したが、本実施形態における
送信部１７は、波長帯λ1 〜λk-1 の変調光および波長
帯λk 〜λm の無変調光をそれぞれ合波する光波長帯フ
ィルタを備え、光ファイバ伝送路２１−１，２１−２に
それぞれ送信する。その他の構成は、第２の実施形態と
同様である。なお、波長ルータ２０は、光ファイバ伝送
路２１−１を介して伝送された波長帯λ1 〜λk-1 の変
調光と、光ファイバ伝送路２１−２を介して伝送された
波長帯λk 〜λm の無変調光を入力し、各ＯＮＵ対応に
分波する。例えば、波長λ1,1 〜λk-1,1 の変調光と波
長λk,1〜λm,1 の無変調光を合流してＯＮＵ３０−１
に送信する。OSU in the second embodiment shown in FIG.
The transmission unit 11 of FIG. 10 multiplexes the modulated light of the wavelength bands λ1 to λk-1 and the unmodulated light of the wavelength bands λk to λm collectively by the optical wavelength band filter (combiner) 13. The transmission unit 17 includes optical wavelength band filters for multiplexing modulated light in the wavelength bands λ1 to λk-1 and unmodulated light in the wavelength bands λk to λm, respectively. Send each. Other configurations are the same as those of the second embodiment. It should be noted that the wavelength router 20 transmits the modulated light in the wavelength bands λ1 to λk-1 transmitted through the optical fiber transmission line 21-1 and the wavelength bands λk to λm transmitted through the optical fiber transmission line 21-2. Is input and demultiplexed corresponding to each ONU. For example, the ONU 30-1 combines the modulated light having the wavelengths λ1,1 to λk-1,1 and the unmodulated light having the wavelengths λk, 1 to λm, 1.
Send to
【００２６】（第５の実施形態）図１１は、本発明の第
５の実施形態を示す。本実施形態の特徴は、第３の実施
形態と第４の実施形態を組み合わせたところにある。(Fifth Embodiment) FIG. 11 shows a fifth embodiment of the present invention. The feature of this embodiment lies in the combination of the third embodiment and the fourth embodiment.
【００２７】すなわち、第３の実施形態におけるＯＳＵ
１０の送信部１１を第４の実施形態における送信部１７
に代え、波長帯λ1 〜λk-1 の変調光を光ファイバ伝送
路２１を介して伝送する。また、ＯＳＵ１０と波長ルー
タ２０との間の光ファイバ伝送路２３は、波長帯λk 〜
λm の無変調光（下り信号）および変調光（上り信号）
を双方向伝送する。その他の構成は第３の実施形態と同
様である。That is, the OSU in the third embodiment
The ten transmission units 11 are replaced by the transmission units 17 in the fourth embodiment.
, The modulated light in the wavelength bands λ1 to λk-1 is transmitted via the optical fiber transmission line 21. The optical fiber transmission line 23 between the OSU 10 and the wavelength router 20 has a wavelength band λk
λm unmodulated light (down signal) and modulated light (up signal)
Is transmitted in both directions. Other configurations are the same as those of the third embodiment.
【００２８】[0028]
【発明の効果】以上説明したように、本発明の波長多重
双方向光伝送システムは、下り信号用と上り信号用の波
長帯が異なるように設定することにより、各ユーザ装置
に対してそれぞれ下り信号となる変調光と上り信号用の
無変調光を波長多重によって同時に伝送することがで
き、伝送効率を高めることができる。また、下り信号用
および上り信号用の各波長帯をそれぞれ複数用意するこ
とにより、伝送効率（伝送速度）を低下させることなく
通信容量を増大することができる。As described above, the wavelength division multiplexing bidirectional optical transmission system of the present invention sets the wavelength bands for the downlink signal and the uplink signal to be different from each other, so that the downlink is provided to each user equipment. Modulated light serving as a signal and unmodulated light for an upstream signal can be simultaneously transmitted by wavelength multiplexing, and transmission efficiency can be improved. In addition, by preparing a plurality of wavelength bands for downlink signals and a plurality of wavelength bands for uplink signals, the communication capacity can be increased without lowering the transmission efficiency (transmission speed).
【００２９】また、波長ルータは、各波長帯の変調光お
よび無変調光から各ユーザ装置に割り当てた波長の変調
光および無変調光をそれぞれ分波して各ユーザ装置に伝
送することにより、各ユーザ装置では波長帯ごとに分離
する共通の光波長帯フィルタを用いて変調光と無変調光
を分離することができる。すなわち、各ユーザ装置は高
い精度を要しない光波長帯フィルタを用い、しかもすべ
て共通の構成で実現できるので、ユーザ装置のコストを
大幅に低減することができる。The wavelength router demultiplexes the modulated light and the unmodulated light of the wavelength allocated to each user device from the modulated light and the unmodulated light of each wavelength band, and transmits the demultiplexed light to each user device. The user apparatus can separate modulated light and unmodulated light using a common optical wavelength band filter that separates each wavelength band. That is, since each user device uses an optical wavelength band filter that does not require high accuracy and can be realized with a common configuration, the cost of the user device can be significantly reduced.
【図１】本発明の第１の実施形態を示すブロック図。FIG. 1 is a block diagram showing a first embodiment of the present invention.
【図２】第１の実施形態におけるＯＳＵ１０の構成例を
示すブロック図。FIG. 2 is a block diagram showing a configuration example of an OSU 10 according to the first embodiment.
【図３】第１の実施形態におけるＯＮＵ３０−ｉの構成
例を示すブロック図。FIG. 3 is a block diagram showing a configuration example of an ONU 30-i according to the first embodiment.
【図４】本発明の第２の実施形態を示すブロック図。FIG. 4 is a block diagram showing a second embodiment of the present invention.
【図５】第２の実施形態におけるＯＳＵ１０の構成例を
示すブロック図。FIG. 5 is a block diagram showing a configuration example of an OSU 10 according to the second embodiment.
【図６】第２の実施形態におけるＯＮＵ３０−ｉの構成
例を示すブロック図。FIG. 6 is a block diagram showing a configuration example of an ONU 30-i according to the second embodiment.
【図７】第２の実施形態における各ＯＮＵの波長割り当
て例を示す図。FIG. 7 is a diagram showing an example of wavelength assignment of each ONU in the second embodiment.
【図８】第２の実施形態における各ＯＮＵの波長割り当
て例を示す図。FIG. 8 is a diagram showing an example of wavelength assignment of each ONU in the second embodiment.
【図９】本発明の第３の実施形態を示すブロック図。FIG. 9 is a block diagram showing a third embodiment of the present invention.
【図１０】本発明の第４の実施形態を示すブロック図。FIG. 10 is a block diagram showing a fourth embodiment of the present invention.
【図１１】本発明の第５の実施形態を示すブロック図。FIG. 11 is a block diagram showing a fifth embodiment of the present invention.
【図１２】従来の双方向光伝送システムの構成例を示す
ブロック図。FIG. 12 is a block diagram showing a configuration example of a conventional bidirectional optical transmission system.
【図１３】従来の双方向光伝送システムにおける各ＯＮ
Ｕの波長割り当て例を示す図。FIG. 13 shows each ON in the conventional bidirectional optical transmission system.
The figure which shows the example of wavelength allocation of U.
１０ 局側装置（ＯＳＵ） １１，１７ 送信部 １２ 多波長光源 １３ 光波長帯フィルタ（合波器） １４ 受信部 １５ 光受信器 １６ 光波長帯フィルタ（分波器） ２０ 波長ルータ ２１，２２，２３ 光ファイバ伝送路 ２４ 光サーキュレータ ３０ ユーザ装置（ＯＮＵ） ３１ 光波長帯フィルタ（分波器） ３２ 光受信器 ３３ 光変調器 ３４ 光波長帯フィルタ（合波器） ５０ 局側装置（ＯＳＵ） ５１ 送信部 ５２ 受信部 ６０ 波長ルータ ６１，６２ 光ファイバ伝送路 ７０ ユーザ装置（ＯＮＵ） ７１ 光カプラ ７２ 光受信器 ７３ 光変調器 DESCRIPTION OF SYMBOLS 10 Station side apparatus (OSU) 11, 17 Transmitting part 12 Multi-wavelength light source 13 Optical wavelength band filter (combiner) 14 Receiving part 15 Optical receiver 16 Optical wavelength band filter (demultiplexer) 20 Wavelength router 21, 22, Reference Signs List 23 optical fiber transmission line 24 optical circulator 30 user device (ONU) 31 optical wavelength band filter (demultiplexer) 32 optical receiver 33 optical modulator 34 optical wavelength band filter (multiplexer) 50 station side device (OSU) 51 Transmitter 52 Receiver 60 Wavelength router 61, 62 Optical fiber transmission line 70 User equipment (ONU) 71 Optical coupler 72 Optical receiver 73 Optical modulator
Claims (12)
数のユーザ装置（ＯＮＵ）との間を波長ルータおよび光
ファイバ伝送路を介して接続し、局側装置は各ユーザ装
置への下り信号として変調光および無変調光を送信し、
各ユーザ装置は変調光を受信し、無変調光を変調して上
り信号として送信する双方向光伝送システムにおいて、 下り信号用および上り信号用としてそれぞれ１つまたは
複数の異なる波長帯を割り当て、各ユーザ装置に下り信
号用および上り信号用として各波長帯の中からそれぞれ
異なる波長を割り当てることを特徴とする波長多重双方
向光伝送システム。An optical network unit connects an optical network unit (OSU) and a plurality of user equipments (ONUs) without a light source via a wavelength router and an optical fiber transmission line. Transmit modulated light and unmodulated light as downlink signals,
In a bidirectional optical transmission system that receives modulated light, modulates unmodulated light, and transmits it as an uplink signal, each user device allocates one or more different wavelength bands for downlink signals and uplink signals, respectively. A wavelength multiplexing bidirectional optical transmission system, wherein different wavelengths are assigned to user equipment from among respective wavelength bands for downlink signals and uplink signals.
当てた１つまたは複数の波長帯の変調光を送信し、上り
信号用として割り当てた１つまたは複数の波長帯の無変
調光を送信する送信部と、上り信号用として割り当てた
１つまたは複数の波長帯の変調光を受信する受信部とを
備えたことを特徴とする請求項１に記載の波長多重双方
向光伝送システム。2. The optical line terminal transmits modulated light of one or more wavelength bands allocated for downlink signals and transmits unmodulated light of one or more wavelength bands allocated for uplink signals. The wavelength multiplexing bidirectional optical transmission system according to claim 1, further comprising: a transmission unit that performs the transmission and a reception unit that receives modulated light in one or a plurality of wavelength bands allocated for the upstream signal.
が異なる複数の多波長光源を備え、その１つまたは複数
の多波長光源を下り信号用として変調光の送信に用い、
残りの多波長光源を上り信号用として無変調光の送信に
用いる構成であることを特徴とする請求項２に記載の波
長多重双方向光伝送システム。3. The transmitting unit of the station-side device includes a plurality of multi-wavelength light sources having different wavelength bands from each other, and uses one or a plurality of the multi-wavelength light sources for transmitting modulated light for a downlink signal.
3. The wavelength multiplexed bidirectional optical transmission system according to claim 2, wherein the remaining multi-wavelength light sources are used for transmitting unmodulated light for upstream signals.
び無変調光を合波して１本の光ファイバ伝送路を介して
伝送し、前記波長ルータで各波長帯の変調光および無変
調光から各ユーザ装置に割り当てた波長の変調光および
無変調光をそれぞれ分波して各ユーザ装置に伝送する構
成であることを特徴とする請求項２に記載の波長多重双
方向光伝送システム。4. The modulated light and the unmodulated light transmitted from the optical line terminal are multiplexed and transmitted through one optical fiber transmission line, and the modulated light and the unmodulated light in each wavelength band are transmitted by the wavelength router. 3. The wavelength multiplexing bidirectional optical transmission system according to claim 2, wherein a modulated light and an unmodulated light having a wavelength allocated to each user apparatus are demultiplexed from light and transmitted to each user apparatus.
び無変調光をそれぞれ個別の光ファイバ伝送路を介して
伝送し、前記波長ルータで各波長帯の変調光および無変
調光から各ユーザ装置に割り当てた波長の変調光および
無変調光をそれぞれ分波して各ユーザ装置に伝送する構
成であることを特徴とする請求項２に記載の波長多重双
方向光伝送システム。5. The modulated light and the unmodulated light transmitted from the optical line terminal are transmitted through separate optical fiber transmission lines, and the wavelength router modulates each user from the modulated light and the unmodulated light in each wavelength band. 3. The wavelength-division multiplexed bidirectional optical transmission system according to claim 2, wherein the modulated light and the unmodulated light having the wavelength allocated to the device are respectively demultiplexed and transmitted to each user device.
光を波長帯ごとに分波する光波長帯フィルタと、前記光
波長帯フィルタで分波された各波長帯の変調光から各ユ
ーザ装置に割り当てた波長の変調光を順次受信する光受
信器とを備えたことを特徴とする請求項２に記載の波長
多重双方向光伝送システム。6. A receiving unit of the optical line terminal, comprising: an optical wavelength band filter that divides the received modulated light for each wavelength band; and a modulated light of each wavelength band that is demultiplexed by the optical wavelength band filter. 3. The wavelength multiplexing bidirectional optical transmission system according to claim 2, further comprising: an optical receiver for sequentially receiving modulated light having a wavelength assigned to the user apparatus.
長帯ごとに分波する光波長帯フィルタと、前記光波長帯
フィルタで分波された下り信号用の１つまたは複数の波
長の変調光を受信する１つまたは複数の光受信器と、前
記光波長帯フィルタで分波された上り信号用の１つまた
は複数の波長の無変調光を変調する１つまたは複数の光
変調器とを備えたことを特徴とする請求項１に記載の波
長多重双方向光伝送システム。7. An optical wavelength band filter for demultiplexing received modulated light for each wavelength band, and modulating one or more wavelengths for a downstream signal demultiplexed by the optical wavelength band filter. One or more optical receivers for receiving light, one or more optical modulators for modulating one or more wavelengths of unmodulated light for upstream signals split by the optical wavelength band filter, The wavelength multiplexing bidirectional optical transmission system according to claim 1, further comprising:
される下り信号と、前記波長ルータから前記局側装置に
送信される上り信号とをそれぞれ個別の光ファイバ伝送
路を介して伝送する構成であることを特徴とする請求項
１に記載の波長多重双方向光伝送システム。8. A configuration in which a downstream signal transmitted from the optical line terminal to the wavelength router and an upstream signal transmitted from the wavelength router to the optical line terminal are transmitted through separate optical fiber transmission lines. The wavelength multiplexing bidirectional optical transmission system according to claim 1, wherein
される下り信号と、前記波長ルータから前記局側装置に
送信される上り信号とを共通の光ファイバ伝送路を介し
て双方向に伝送する構成であることを特徴とする請求項
１に記載の波長多重双方向光伝送システム。9. A bidirectional transmission of a downlink signal transmitted from the optical line terminal to the wavelength router and an uplink signal transmitted from the wavelength router to the optical line terminal via a common optical fiber transmission line. 2. The wavelength division multiplexed bidirectional optical transmission system according to claim 1, wherein:
信される下り信号の変調光と無変調光とをそれぞれ個別
の光ファイバ伝送路を介して伝送する構成であることを
特徴とする請求項１に記載の波長多重双方向光伝送シス
テム。10. A configuration in which modulated light and unmodulated light of a downstream signal transmitted from the optical line terminal to the wavelength router are transmitted through separate optical fiber transmission lines. 2. The wavelength multiplexing bidirectional optical transmission system according to 1.
送信される下り信号と、前記ユーザ装置から前記波長ル
ータに送信される上り信号とをそれぞれ個別の光ファイ
バ伝送路を介して伝送する構成であることを特徴とする
請求項１に記載の波長多重双方向光伝送システム。11. A configuration in which a downstream signal transmitted from the wavelength router to the user apparatus and an upstream signal transmitted from the user apparatus to the wavelength router are transmitted through separate optical fiber transmission lines. The wavelength multiplexing bidirectional optical transmission system according to claim 1, wherein:
送信される下り信号と、前記ユーザ装置から前記波長ル
ータに送信される上り信号とを共通の光ファイバ伝送路
を介して双方向に伝送する構成であることを特徴とする
請求項１に記載の波長多重双方向光伝送システム。12. A configuration in which a downstream signal transmitted from the wavelength router to the user apparatus and an upstream signal transmitted from the user apparatus to the wavelength router are bidirectionally transmitted via a common optical fiber transmission line. The wavelength multiplexing bidirectional optical transmission system according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10372610A JP2000196536A (en) | 1998-12-28 | 1998-12-28 | WDM bidirectional optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10372610A JP2000196536A (en) | 1998-12-28 | 1998-12-28 | WDM bidirectional optical transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000196536A true JP2000196536A (en) | 2000-07-14 |
Family
ID=18500740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10372610A Pending JP2000196536A (en) | 1998-12-28 | 1998-12-28 | WDM bidirectional optical transmission system |
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| Country | Link |
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| JP (1) | JP2000196536A (en) |
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