CN101620357B - Optical signal demodulator and demodulation method - Google Patents
Optical signal demodulator and demodulation method Download PDFInfo
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- CN101620357B CN101620357B CN2008100681727A CN200810068172A CN101620357B CN 101620357 B CN101620357 B CN 101620357B CN 2008100681727 A CN2008100681727 A CN 2008100681727A CN 200810068172 A CN200810068172 A CN 200810068172A CN 101620357 B CN101620357 B CN 101620357B
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Abstract
The invention provides an optical signal demodulator and a demodulation method. In the demodulation method, a beam of phase-modulated optical signal is input to the demodulator and is demodulated into two beams of intense modulated optical signals having a preset phase difference by an interferometer structure in the demodulator. A refractive index adjustable optical component in the demodulator can also realize a function of demodulating any wavelength signal or a plurality of wavelength signals in an optical communication bandwidth.
Description
Technical field
The present invention relates to a kind of light position phase decoder device, relate in particular to a kind of detuner and control method that is used for demodulation optical communication signal.
Background technology
In the coherent light transmission, the effect of light position phase detuner is: convert the light position phase signals in the light transmission into light intensity signal.Its principle is as shown in Figure 1: the signal beams of input (a), signal beams (b) are phase modulated signal, convert strength signal light beam (a '), strength signal light beam (b ') into, export with strength signal light beam (c) at last.
The light position phase detuner of prior art utilizes the Michelson principle of interference usually, converts the phase information in existence and the light beam into strength information, and is as shown in Figure 2: the light intensity and the relation between the phasic difference of the two-beam of outgoing are following after interfering:
N=1 in free space, Δ L=L2-L1.
Through calculating, to each ITU wavelength, set Δ L, can draw following table through above-mentioned formula, accomplish phase demodulating:
| The |
0 | |
| Output intensity | ||
| 0 | 1 |
In order to reach the demodulation of high s/n ratio, the delay inequality between two arms of said interferometer must satisfy two conditions.At first, time-delay must equal the integral multiple of the bit time of signal of communication; Secondly, the light phase delay inequality must be the integral multiple of П for optical carrier, so that interfere light wave homophase or anti-phase exactly.Because in solid-state (solid-state) uses; Light is through the refractive index and temperature correlation of its material of in interferometer, propagating; Therefore the temperature fluctuation of interferometer possibly cause the off resonance of interferometer; Therefore, utilizing thermoelectric (al) cooler cooling interferometer to reach temperature stabilization is a kind of scheme that solves this temperature fluctuation.
Because above-mentioned thermoelectric (al) cooler cooling interferometer can produce temperature difference, causes frequency drift serious, especially for to the arbitrary wavelength signals in the optical communication bandwidth or the demodulation function of a plurality of wavelength signals.
Summary of the invention
The objective of the invention is to propose that a kind of wavelength of optical signal is adjustable, the light signal detuner of temperature stabilization.
Another object of the present invention is to provide that a kind of wavelength of optical signal is adjustable, the demodulation method of temperature stabilization.
To achieve these goals; The present invention provides a kind of light signal detuner; Comprise the light signal input port; First and second light signal output end mouth and interferometer structure is characterized in that: said interferometer structure comprises that the constant power optical splitter has a spectro-film, input optical signal is divided into first and second light signal of two bundle constant powers; The upper surface of said optical splitter has first separation scraper, and first light signal that spectro-film is separated returns optical splitter; One second separation scraper is affixed on the right side of this optical splitter; Said second separation scraper has the divider arms of two equidistance length, and said divider arms has lower expansion coefficient, and the right side of said divider arms has second reflectance coating; Said separation scraper comprises that also a refractive index adjustable optical assembly places the light path of second light signal; Through changing temperature or its refractive index of voltage-regulation, thereby regulate the light path of second light signal, second light signal that said spectro-film separates is through the divider arms of said optical element; And refractive index adjustable optical assembly, return optical splitter by second reflectance coating; First and second light signal interferes in desired location, and two beam interferometer light are respectively from first and second light signal output end mouth output.
Wherein, preferable embodiment is: the upper surface that said first separation scraper can be optical splitter is coated with one first reflectance coating.
Wherein, preferable embodiment is: said refractive index adjustable optical assembly comprises that a thermistor feeds back the temperature of this optical module, and a resistive film is regulated temperature to this optical module.
Wherein, preferable embodiment is: said refractive index adjustable optical assembly can be the silicon material or liquid crystal is formed.
Wherein, preferable embodiment is: said input port, light signal output end mouth comprise an optical collimator respectively, and light signal is collimated.
Wherein, preferable embodiment is: said interferometer can be Mach-Zehnder, Taylor and Michelson interferometer.
Wherein, preferable embodiment is: the left and right and lower end of said optical splitter is provided with high transmittance film.
Wherein, preferable embodiment is: the expansion coefficient of said at least one divider arms can be between the 0.01ppm/K-0.04ppm/K.
The present invention also comprises a kind of demodulation method of light signal detuner; The steps include: that a. sets up said light signal detuner, it comprises the light signal input port, first and second light signal output end mouth and interferometer structure; Wherein, light signal input port input position phase modulated light signal; B. regulate refractive index adjustable optical assembly and connect the temperature of resistive film, thereby the refractive index of regulating refractive index adjustable optical assembly makes the demodulation wavelength and the input optical signal of this detuner Wavelength matched; The temperature variation of the refractive index adjustable optical assembly that c. causes through the temperature change of thermistor feedback environment; D. lock the temperature of refractive index adjustable optical assembly, thus locking demodulation wavelength, the intensity modulated light signal after first and second light signal output end mouth output demodulation.
Wherein, preferred version is: among the step a, set up interferometer, said interferometer structure comprises that the constant power optical splitter has a spectro-film, input optical signal is divided into first and second light signal of two bundle constant powers; The upper surface of said optical splitter has first separation scraper, and first light signal that spectro-film is separated returns optical splitter; One second separation scraper is affixed on the right side of this optical splitter; Said second separation scraper has the divider arms of two equidistance length, and said divider arms has lower expansion coefficient, and the right side of said divider arms has second reflectance coating; Said separation scraper comprises that also a refractive index adjustable optical assembly places the light path of second light signal; Through changing temperature or its refractive index of voltage-regulation, thereby regulate the light path of second light signal, second light signal that said spectro-film separates is through the divider arms of said optical element; And refractive index adjustable optical assembly, return optical splitter by second reflectance coating; First and second light signal interferes in desired location, and two beam interferometer light are respectively from first and second light signal output end mouth output.
Wherein, preferred version is: the upper surface that said first separation scraper can be optical splitter is coated with one first reflectance coating.
Wherein, preferred version is: said refractive index adjustable optical assembly comprises that a thermistor feeds back the temperature of this optical module, and a resistive film is regulated temperature to this optical module.
Wherein, preferred version is: said refractive index adjustable optical assembly can be the silicon material or liquid crystal is formed.
Wherein, preferred version is: said interferometer can be Mach-Zehnder, Taylor and Michelson interferometer.
Wherein, preferred version is: the left and right and lower end of said optical splitter is provided with high transmittance film.
Wherein, preferred version is: the expansion coefficient of said at least one divider arms can be between the 0.01ppm/K-0.04ppm/K.
Advantage of the present invention is: owing to can make the demodulation wavelength and the input optical signal of this detuner Wavelength matched, and optical path difference is fine-tuning along with the temperature variation refraction index changing through refractive index adjustable optical assembly; Moreover, because said first and second space has expansion coefficient and is: between the 0.01ppm/K-0.04ppm/K, make its temperature stability better.
Description of drawings
Engaging accompanying drawing below further specifies embodiments of the invention:
Fig. 1 is the schematic diagram of existing light signal detuner.
Fig. 2 is the structure principle chart of existing light signal detuner.
Fig. 3 is the structural representation of first embodiment of light signal detuner of the present invention.
Fig. 4 is the structural representation of second embodiment of light signal detuner of the present invention.
Fig. 5 is the index path of light signal detuner of the present invention.
Fig. 6 is the structural representation of refractive index adjustable optical assembly 334.
Fig. 7 is the block diagram of the conciliation method of light signal detuner of the present invention.
Fig. 8 representes the interference image of light conciliation signal of the present invention under different temperature condition.
Embodiment
Below in conjunction with accompanying drawing quick high accuracy of the present invention is described further number conversion.
Fig. 3 is the structural representation of first embodiment of detuner of the present invention.Input port 1 receiving inputted signal of this detuner, said input port 1 comprise the accurate value device 11 of first light, are connected to the power optical splitter (power splitter) 31 of Mach-Zehnder interferometer 3.It has a spectro-film 311; The right side optics of said optical splitter 31 connects separation scraper 33; Said separation scraper 33 has corresponding first divider arms 331, second divider arms 332; Its length is L; Wherein said first and second divider arms 331,332 has low-expansion coefficient, and its expansion coefficient can be: between the 0.01ppm/K-0.04ppm/K, the upper surface of optical splitter 31 comprises first reflectance coating 312; The right side of said first and second divider arms 331,332 has second reflectance coating 313 and is plated in the substrate 20; Said first and second divider arms 331, comprise between 332 that a refractive index adjustable optical assembly 334 places light path, have certain refractive index, and the refractive index of this optical material changes along with variation of temperature.Make the demodulation wavelength and the input optical signal of this detuner Wavelength matched, and the intensity-modulated signal after first and second light signal output end mouth 2,4 output modulation.
Wherein, said first reflectance coating 312 also can be a separation scraper and separation scraper 33 is similar, and its two-way optical path difference satisfies its interference condition and gets final product.
Wherein, preferred embodiment does, said optical splitter 31 is provided with first reflectance coating 312 except the upper surface, and remaining left and right and lower surface is provided with high transmittance film 314,315 and 316.
Fig. 4 is the structural representation of second embodiment of light signal detuner of the present invention; As shown in Figure 4; Input port 1 receiving inputted signal of this detuner, said input port 1 comprise the accurate value device 11 of first light, are connected to the power optical splitter (power splitter) 31 of interferometer 3.It has a spectro-film 311; The right side optics of said optical splitter 31 connects separation scraper 33; Separation scraper 40 can comprise the groove 41 of a U type structure, the groove 41 lateral light gummed of said U type structure and the right side of optical splitter 31, and said groove 41 comprises first and second divider arms 411,412; Said first and second divider arms 411,412 has low-expansion coefficient; Its expansion coefficient can be: between the 0.01ppm/K-0.04ppm/K, the upper surface of optical splitter 31 comprises first reflectance coating 312, and the bottom land 413 of said groove 41 is coated with second reflectance coating 313; A ccontaining refractive index adjustable optical assembly 334 places light path in the said groove 41; And the refractive index of this optical material changes along with variation of temperature, makes the demodulation wavelength and the input optical signal of this detuner Wavelength matched, and the intensity-modulated signal after first and second light signal output end mouth 2,4 output modulation.
Fig. 5 is the light path principle figure of light signal detuner of the present invention; As shown in Figure 5: incident beam L injects via the first accurate value device 11 accurate values from light signal input port 1; Be divided into light beam L1, the L2 of two bundle constant powers by the spectro-film 311 of optical splitter 31, after wherein the first light beams L1 with the expection light path by first reflectance coating, 312 reflected back optical splitters; Such second light beams L2 crosses spectro-film 311 with expected light Reuter, behind the refractive index adjustable optical assembly 334 between first and second divider arms, by second reflectance coating, 313 reflected back optical splitters 31; The first light beam L1, the second light beam L2 of above-mentioned reflected back optical splitter interfere in desired location; Through collimating apparatus 11 outgoing, the second interference light L2 ' is from 21 outgoing of the first light signal output end mouth, 2 process collimating apparatuss from the second light signal output end mouth 4 for the back first interference light L1 '.
Fig. 6 is the structural representation of refractive index adjustable optical assembly 334 of the present invention; Said refractive index adjustable optical assembly 334 comprises logical light part 335 and Fei Tong light part 336; Non-logical light part 336 is coated with resistive film 3341; The resistance range of this resistive film 3341 is between 5 ohm to 15 ohm, but not the other end of logical light part 336 comprises a thermistor 3342, can feed back this assembly temperature in real time.Wherein, preferred embodiment does, said refractive index adjustable optical assembly 34 can be the silicon material or liquid crystal is formed, thus its refractive index of satisfied temperature or voltage-regulation.
Fig. 7 is the control method of detuner of the present invention, and is as shown in Figure 6, the steps include: that a. sets up above-mentioned light signal demodulator; It comprises light signal input port 1; First and second light signal output end mouth 2,4 and interferometer structure 3, wherein, light signal input port 1 input position phase modulated light signal; B. regulate refractive index adjustable optical assembly 334 and connect the temperature of resistive film 3341, thereby the refractive index of regulating refractive index adjustable optical assembly 334 makes the demodulation wavelength and the input optical signal of this detuner Wavelength matched; The temperature variation of the refractive index adjustable optical assembly 334 that c. causes through thermistor 3342 feedback environment temperature changes; D. lock the temperature of refractive index adjustable optical assembly 334, thus locking demodulation wavelength, the intensity modulated light signal after first and second light signal output end mouth 2,4 output demodulation.
Wherein, Among the step a; Set up above-mentioned Mach-Zehnder interferometer, wherein, comprise that constant power optical splitter 31 has a spectro-film 311; One separation scraper 33 is affixed on the right side of this optical splitter 31; This separation scraper 33 has the divider arms 331,332 and 411,412 that two equidistance length are L, and said divider arms 331,332 and 411,412 has lower expansion coefficient (CTE), and its expansion coefficient specifically can be and is preferable embodiment between the 0.01ppm/K-0.04ppm/K; Said first and second divider arms 331,332 and 411,412 right side have first reflectance coating 312; Said separation scraper 33 comprises that also a refractive index adjustable optical assembly 334 places light path, and said refractive index adjustable optical assembly 334 comprises that at non-logical light face the temperature of 3341 pairs of these optical modules of a thermistor feeds back, and 3342 pairs of these optical modules of a resistive film are regulated temperature; Another light path of said optical splitter 31 has second reflectance coating 313, will return at the light beam that spectro-film 12 separates.
Wherein, said first reflectance coating 312 also can be a separation scraper and separation scraper 33 is similar, and its two-way optical path difference satisfies its interference condition and gets final product.
Wherein, preferred embodiment does, said optical splitter 31 is provided with first reflectance coating 312 except the upper surface, and remaining left and right and lower surface is provided with high transmittance film 314,315 and 316.
As shown in Figure 8, the thermal refractive index coefficient value of said refractive index adjustable optical assembly 334 (Δ n/ Δ T) scope is: 50-150*10E6 (1/C).Said refractive index adjustable optical assembly 334 scalable optical path differences, the scope of variable quantity is between the 1.5um-4.5um.Owing to control the light phase delay of separation scraper 33 through temperature.Solid-line curve among Fig. 8 has been pointed out the output light signal curve with temperature change; Wherein, Comprise 45 ℃, 50 ℃, 55 ℃, 60 ℃, the 65 ℃ restituted signals of output down, owing to make the refractive index of refractive index adjustable optical assembly 334 depend on temperature, so this optical path difference is fine-tuning; Thereby the valley point to interference waveform is regulated; The valley wavelength points corresponds to operation wavelength the most at last, then through temperature locking optical module refractive index, can exactly control phase relation interference signal ground two parts between on one side.
Advantage of the present invention is: owing to can make the demodulation wavelength and the input optical signal of this detuner Wavelength matched, and optical path difference is fine-tuning along with the temperature variation refraction index changing through refractive index adjustable optical assembly 33; Moreover, because said first and second divider arms 331,332 has expansion coefficient and is: between the 0.01ppm/K-0.04ppm/K, make its temperature stability good.
The above person is merely most preferred embodiment of the present invention, is not to be used to limit scope of the present invention, and all equivalences of doing according to claim of the present invention change or modify, and are all the present invention and contain.
Claims (16)
1. light signal detuner; Comprise the light signal input port; First and second light signal output end mouth and interferometer structure is characterized in that: said interferometer structure comprises that the constant power optical splitter has a spectro-film, input optical signal is divided into first and second light signal of two bundle constant powers; The upper surface of said optical splitter has first separation scraper, and first light signal that spectro-film is separated returns optical splitter; One second separation scraper is affixed on the right side of this optical splitter; Said second separation scraper has the divider arms of two equidistance length, and said divider arms has lower expansion coefficient, and the right side of said divider arms has second reflectance coating; Said separation scraper comprises that also a refractive index adjustable optical assembly places the light path of second light signal; Through changing temperature or its refractive index of voltage-regulation, thereby regulate the light path of second light signal, second light signal that said spectro-film separates is through the divider arms of said optical element; And refractive index adjustable optical assembly, return optical splitter by second reflectance coating; First and second light signal interferes at the spectro-film place, and two beam interferometer light are respectively from first and second light signal output end mouth output.
2. light signal regulator as claimed in claim 1 is characterized in that: the upper surface that said first separation scraper can be optical splitter is coated with one first reflectance coating.
3. light signal regulator as claimed in claim 1 is characterized in that: said refractive index adjustable optical assembly comprises that a thermistor feeds back the temperature of this optical module, and a resistive film is regulated temperature to this optical module.
4. light signal regulator as claimed in claim 1 is characterized in that: said refractive index adjustable optical assembly can be the silicon material or liquid crystal is formed.
5. light signal regulator as claimed in claim 1 is characterized in that: said input port, light signal output end mouth comprise an optical collimator respectively, and light signal is collimated.
6. light signal regulator as claimed in claim 1 is characterized in that: said interferometer can be Mach-Zehnder, Taylor and Michelson interferometer.
7. light signal regulator as claimed in claim 1 is characterized in that: the left and right and lower end of said optical splitter is provided with high transmittance film.
8. light signal regulator as claimed in claim 1 is characterized in that: the expansion coefficient of said at least one divider arms can be between the 0.01ppm/K-0.04ppm/K.
9. the demodulation method of a light signal detuner the steps include: that a. sets up said light signal detuner, and it comprises the light signal input port, first and second light signal output end mouth and interferometer structure, wherein, a light signal input port input position phase modulated light signal; B. regulate refractive index adjustable optical assembly and connect the temperature of resistive film, thereby the refractive index of regulating refractive index adjustable optical assembly makes the demodulation wavelength and the input optical signal of this detuner Wavelength matched; The temperature variation of the refractive index adjustable optical assembly that c. causes through the temperature change of thermistor feedback environment; D. lock the temperature of refractive index adjustable optical assembly, thus locking demodulation wavelength, the intensity modulated light signal after first and second light signal output end mouth output demodulation.
10. the demodulation method of light signal regulator as claimed in claim 9; It is characterized in that: among the step a; Set up interferometer, said interferometer structure comprises that the constant power optical splitter has a spectro-film, input optical signal is divided into first and second light signal of two bundle constant powers; The upper surface of said optical splitter has first separation scraper, and first light signal that spectro-film is separated returns optical splitter; One second separation scraper is affixed on the right side of this optical splitter; Said second separation scraper has the divider arms of two equidistance length, and said divider arms has lower expansion coefficient, and the right side of said divider arms has second reflectance coating; Said separation scraper comprises that also a refractive index adjustable optical assembly places the light path of second light signal; Through changing temperature or its refractive index of voltage-regulation, thereby regulate the light path of second light signal, second light signal that said spectro-film separates is through the divider arms of said optical element; And refractive index adjustable optical assembly, return optical splitter by second reflectance coating; First and second light signal interferes at the spectro-film place, and two beam interferometer light are respectively from first and second light signal output end mouth output.
11. the demodulation method of light signal regulator as claimed in claim 9 is characterized in that: the upper surface that said first separation scraper can be optical splitter is coated with one first reflectance coating.
12. the demodulation method of light signal regulator as claimed in claim 9 is characterized in that: said refractive index adjustable optical assembly comprises that a thermistor feeds back the temperature of this optical module, and a resistive film is regulated temperature to this optical module.
13. the demodulation method of light signal regulator as claimed in claim 9 is characterized in that: said refractive index adjustable optical assembly can be the silicon material or liquid crystal is formed.
14. the demodulation method of light signal regulator as claimed in claim 9 is characterized in that: said interferometer can be Mach-Zehnder, Taylor and Michelson interferometer.
15. the demodulation method of light signal regulator as claimed in claim 9 is characterized in that: the left and right and lower end of said optical splitter is provided with high transmittance film.
16. the demodulation method of light signal regulator as claimed in claim 9 is characterized in that: the expansion coefficient of said at least one divider arms can be between the 0.01ppm/K-0.04ppm/K.
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| CN103823324A (en) * | 2014-02-20 | 2014-05-28 | 浙江师范大学 | Optical filter of Michelson flattop interferometer |
| US20250164233A1 (en) * | 2022-02-23 | 2025-05-22 | Beijing Bywave Sensing Technology Co., Ltd. | Demodulation system for optical fiber fabry-perot sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916748A (en) * | 2006-08-31 | 2007-02-21 | 上海理工大学 | System of frequency modulation of semiconductor laser through injecting current without mechanical flying spot scanning interference |
| EP1770714A1 (en) * | 2005-09-30 | 2007-04-04 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Optical device for measuring modulated signal light |
| CN201017069Y (en) * | 2007-04-09 | 2008-02-06 | 钱祥忠 | Optical fiber grating wavelength demodulating equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1770714A1 (en) * | 2005-09-30 | 2007-04-04 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Optical device for measuring modulated signal light |
| CN1916748A (en) * | 2006-08-31 | 2007-02-21 | 上海理工大学 | System of frequency modulation of semiconductor laser through injecting current without mechanical flying spot scanning interference |
| CN201017069Y (en) * | 2007-04-09 | 2008-02-06 | 钱祥忠 | Optical fiber grating wavelength demodulating equipment |
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