KR101767401B1 - Sorting Method the LD and Single-mode Optical Cable And Array Typed Optical Communication Module Manufacturing Method using the Present Method - Google Patents

Abstract

The present invention relates to a method of aligning an LD and a single mode optical cable and a method of manufacturing an array type optical communication module using the method. More particularly, the present invention relates to a method of manufacturing an array type optical communication module by diffusing a distal end of a single mode optical cable at a high temperature, Mode optical cable in which a single mode optical cable and a multimode optical cable are connected by a heat treatment or a discharge method so that a waveguide inside the optical cable is tapered to manufacture a single mode optical cable 10, A V-groove fabrication step of fabricating a V-groove having a V-shaped groove in which a single-mode optical cable fabricated in the V-groove is fixed, a coupling step of laterally joining the end of the single-mode optical cable to a V- A signal light emitting region of the LD and a single mode optical cable The alignment of the LD and the single-mode optical fiber cable consisting of a sorting step method of aligning the waveguides and to the optical communication module manufacturing method of an array type using the present method.

Description

[0001] The present invention relates to a method of aligning an LD and a single mode optical cable, and an array type optical communication module manufacturing method using the method.

The present invention relates to a method of aligning an LD and a single mode optical cable and a method of fabricating an array type optical communication module using the method. More particularly, the present invention relates to a method of forming a tapered waveguide Mode optical cable in which a single mode optical cable and a multimode optical cable are connected by a heat treatment or a discharge method so that a waveguide inside the optical cable is tapered to manufacture a single mode optical cable 10, A V-groove fabrication step of fabricating a V-groove having a V-shaped groove in which a single-mode optical cable fabricated in the V-groove is fixed, a coupling step of laterally joining the end of the single-mode optical cable to a V- A signal light emitting region of the LD and a single mode optical cable The alignment of the LD and the single-mode optical fiber cable consisting of a sorting step method of aligning the waveguides and to the optical communication module manufacturing method of an array type using the present method.

While the speed of electric signals is limited to 2.5G, optical signals are characterized by high speed (during 100G development in Long Reach) and large capacity data transmission.

 The structure is divided into a module for transmitting data and a module for receiving data such as an electric signal. The transmission is performed by an LD (Laser Diode) (hereinafter referred to as "LD") and a reception is performed by a PD (Photodiode I am responsible.

 When aligning LDs and PDs, the active regions (signal emitting regions) of these chips are so small that alignment is not easy. In addition, direct alignment due to light scattering and LD divergence causes problems of high light loss or low light receiving sensitivity (A problem of PD light sensitivity when matching to LD, and a problem of light loss of LD when it is matched to PD). In order to solve this problem, reflection mirror and lens are used. However, this alignment also requires high technology, There is a productivity problem at the present level of technology.

  In the optical communication, the multimode optical cable is used for short distance because the loss is large enough to cause the optical signal to disappear when transmitting 1 km, while the lossless single mode optical cable can transmit over 100 km.

This patent relates to a technique for aligning LDs on a single mode optical cable (or PLC waveguide) which is easy to make a long reach.

 The diameter of the core (waveguide) of the single mode optical cable is 8 to 10 탆, the size of the core of AWG (wavelength multiplexing), which is the PLC, is about 3 to 6 탆, the active region is about 1 탆, It is practically impossible to arrange directly to an array type fabrication structure because it is very difficult to align with the LDs that occur.

 The multimode optical cable suitable for short distance transmission uses Short Reach parts, so it is relatively easy to align, so 100G products are available.

However, long-reach parts requiring the use of a single mode are under development, and referring to FIGS. 1A to 1C, there is a problem in that a highly precise lens alignment technique is required as a design considered as existing or under development .

The present invention provides a method of easily aligning signal light emission regions of a waveguide and an LD of a single-mode optical cable, which has been devised to overcome the problems of the conventional technique of aligning LDs in a single-mode optical cable that is easy to perform long- There is a purpose.

It is another object of the present invention to provide a method of manufacturing an optical communication module in the form of an array using the above method.

It is another object of the present invention to provide a method capable of reducing the manufacturing cost of a single mode optical cable for long distance transmission, miniaturization, and mass production.

In order to achieve the above object, the method of aligning an LD and a single mode optical cable according to the present invention diffuses the end of the single mode optical cable at a high temperature so as to taper the waveguide inside the optical cable or to heat the single mode optical cable and the multi- A step S10 of fabricating a single mode optical cable 10 in which a waveguide inside the optical cable is tapered to manufacture a single mode optical cable 10; A V-groove fabricating step (S20) of fabricating a V-groove (20) in which a V-shaped V-groove (25) in which a single mode optical cable (10) manufactured in the single-mode optical cable manufacturing step is fixed; A coupling step S30 of transversely coupling the distal end of the single mode optical cable 10 to the V-groove 25 of the V-groove 20; And an aligning step S40 for aligning the waveguide of the single mode optical cable 10 coupled to the signal emitting area 35 of the LD 30 and the V-groove 20 mounted on the substrate 50 do.

A lens processing step S11 of processing the end portion of the waveguide in a tapered shape in the single mode optical cable 10 fabricated in the single mode optical cable fabrication step S10 to a lens shape using a heat treatment, discharge or laser processing method; May be additionally included.

In the single mode optical cable fabricated in the single mode optical cable fabrication step S10, a waveguide is cut at an end portion in a tapered shape at an angle to cut a return loss caused by optical signal transmission, Step S12; < / RTI >

-

사이의 값을 가지고, V 홈의 깊이는

-

사이의 값을 가지는 것을 특징으로 한다.When the V-shaped V-groove in the V-groove has a value between 89 degrees and 91 degrees between its both sides and the radius of the optical cable is D, the width of the V-

-

And the depth of the V-groove is

-

And a value between the first and second values.

Channel array type optical communication module by using any one of the alignment methods described above.

As described above, the alignment method of the LD and the single mode optical cable according to the present invention and the method of fabricating the array type optical communication module using the method can simplify and simplify the alignment of the single mode optical cable and the LD, Cost and time can be drastically reduced.

Also, since the method of fabricating the array type optical communication module using the alignment method is simplified, time and cost reduction, small size, and mass production can be achieved.

Devices that can use the alignment method include optical communication-related optical transceivers, active optical cables (AOC), tunable laser sources, TOSA (Transmitter Subassemblies), and QSFP (Quad Small Form-factor Pluggable) It is possible to reduce manufacturing time and cost, miniaturize and mass production of these products.

1A is a schematic representation of one of the existing techniques for aligning a single mode optical cable and an LD.
1B is a schematic representation of another conventional technique for aligning a single mode optical cable and an LD.
1C is a schematic representation of another conventional technique for aligning a single mode optical cable and an LD.
2A is a diagram illustrating a method of aligning an LD and a single mode optical cable according to the present invention in a time series step.
FIG. 2B is a diagram showing another exemplary method of aligning an LD and a single mode optical cable according to the present invention in a time-series manner.
FIG. 2C is a diagram illustrating another exemplary method of aligning an LD and a single mode optical cable according to the present invention in a time series step. FIG.
FIG. 3 is a diagram showing a single mode optical cable in which a core is tapered in another alignment method of an LD and a single mode optical cable according to the present invention.
FIG. 4 is a view showing an optical fiber lens fabricated at the end of the single mode optical cable of FIG. 3. FIG.
FIG. 5 is a view showing an alignment of an LD and a single mode optical cable by an alignment method of an LD and a single mode optical cable according to the present invention.
FIG. 6A is a diagram illustrating that an LD and a single mode optical cable are aligned on two channels by an alignment method of an LD and a single mode optical cable according to the present invention. FIG.
FIG. 6B is a diagram showing that an LD and a single mode optical cable are aligned in a plurality of channels by an alignment method of an LD and a single mode optical cable according to the present invention.
FIG. 7A is a schematic view of a single-mode optical cable in which LDs and single-mode optical cables arranged according to the present invention are cut at an end portion of the single-mode optical cable at an angle view.
FIG. 7B is a side view of a single-mode optical cable with an LD arranged according to an embodiment of the present invention. FIG.

The present invention will be described in detail with reference to a method of aligning an LD and a single mode optical cable and a method of manufacturing an array type optical communication module using this method. Described as necessary in the embodiments and drawings. Also, the terms defined in this specification and claims should not be construed as limiting the scope of the present invention, but may be changed depending on the intention or the relationship of the operator, and should be construed as meaning and concept consistent with the technical idea of the present invention.

In one aspect of the present invention,

The waveguide inside the optical cable is tapered by diffusing the distal end of the single mode optical cable at a high temperature, or by connecting the single mode optical cable and the multimode optical cable by heat treatment or discharge, A single mode optical cable manufacturing step S10 for manufacturing the single mode optical cable 10; A V-groove fabricating step (S20) of fabricating a V-groove (20) in which a V-shaped V-groove (25) in which a single mode optical cable (10) manufactured in the single-mode optical cable manufacturing step is fixed; A coupling step S30 of transversely coupling the distal end of the single mode optical cable 10 to the V-groove 25 of the V-groove 20; And an aligning step S40 for aligning the waveguide of the single mode optical cable 10 coupled to the signal emitting region 35 of the LD 30 and the V-groove 20 mounted on the substrate 50 And an alignment method of the LD and the single mode optical cable.

According to another aspect of the present invention, there is provided a method of manufacturing an optical communication module of a multi-channel array type using the alignment method.

An alignment method of an LD and a single mode optical cable according to the present invention and a method of fabricating an array type optical communication module using the method are as follows.

FIG. 2A is a diagram illustrating a method of aligning an LD and a single mode optical cable according to the present invention in a time series step. FIGS. 2B and 2C show another method of aligning an LD and a single mode optical cable according to the present invention, respectively FIG. 3 is a diagram showing a single mode optical cable in which a core is tapered in another aligning method of an LD and a single mode optical cable according to the present invention, and FIG. 4 is a cross- FIG. 5 is a view showing that an LD and a single mode optical cable are aligned by an alignment method of an LD and a single mode optical cable according to the present invention, and FIG. The diagram showing that the LD and the single mode optical cable are aligned on the two channels by the alignment method of the LD and the single mode optical cable according to the invention FIG. 6B is a diagram showing that an LD and a single mode optical cable are aligned in a plurality of channels according to an alignment method of an LD and a single mode optical cable according to the present invention. FIG. 7A is a view showing an LD and a single mode optical cable FIG. 7B is a view schematically showing a side view of a single mode optical cable cut at an angle, and FIG. 7B is a side view of a single mode optical cable in which an end portion of the single mode optical cable is cut with an angle, It is the drawing specifically expressed at the time point.

Hereinafter, a method of aligning an LD and a single mode optical cable according to the present invention and a method of fabricating an array type optical communication module using the method will be described in detail with reference to the drawings.

Referring to FIG. 2A, the alignment method of the LD and the single mode optical cable according to the present invention diffuses the distal end of the single mode optical cable at a high temperature to taper the waveguide inside the optical cable or to heat or heat the single mode optical cable and the multimode optical cable. A single mode optical cable fabrication step S10 for fabricating a single mode optical cable 10 by connecting the waveguide inside the optical cable in a tapered manner by a discharge method; A V-groove fabricating step (S20) of fabricating a V-groove (20) in which a V-shaped V-groove (25) in which a single mode optical cable (10) manufactured in the single-mode optical cable manufacturing step is fixed; A coupling step S30 of transversely coupling the distal end of the single mode optical cable 10 to the V-groove 25 of the V-groove 20; And an aligning step S40 for aligning the waveguide of the single mode optical cable 10 coupled to the signal emitting area 35 of the LD 30 and the V-groove 20 mounted on the substrate 50 do.

Referring to FIG. 3, the shape of the single mode optical cable manufactured in the single mode optical cable manufacturing step (S10) can be known. That is, it can be seen that the inner waveguide at one end of the single-mode optical cable for a long-reach transmission (Long Reach) is a tapered shape that widens toward the end. As a result, the optical signal is received from the very narrow signal emitting region (LD) of the laser diode (LD) without optical signal loss.

A lower base structure in which the fabricated single mode optical cable is fixed or mounted is required, which will be described in detail below.

Referring to FIG. 5, in the V-groove fabricating step (S20) of fabricating the V-groove 20 in which the V-shaped V-groove 25 is formed in which the single mode optical cable 10 manufactured in the single- It is possible to know the shape of the V-groove 20 in which the V-shaped V-groove 25 is formed.

-

사이의 값을 가짐이 바람직하며, V 홈의 깊이는

-

사이의 값을 가지도록 함이 바람직하다.In addition, with respect to the size of the V groove 25 to which the fabricated single mode optical cable is fixed or to be mounted, the V groove 25 of the V-shaped groove in the V groove has an angle between 89 degrees and 91 degrees And when the radius of the optical cable is D, the width of the V groove is

-

, And the depth of the V-groove is preferably

-

And a value between the two values.

The above numerical limitations are physical. In order to transmit a signal emitted from the signal emitting region of the LD to a few micrometers of the single mode optical cable, a very thin waveguide transmits the signal without loss, the range of the angle, width and depth of the groove of the V- It is decided.

It is needless to say that the height of the V-groove to be manufactured should be determined in consideration of the height of a substrate on which an LD and LD driver to be mounted will be mounted, and the height of the signal emitting region of the LD.

In addition, if the fabricated single mode optical cable is stably fixed, the groove to be formed may have other grooves than the V-groove.

5, the coupling step S30 of coupling the distal end of the single mode optical cable 10 transversely to the V-groove 25 of the V-groove 20 and the coupling of the LD 30 mounted on the substrate 50, And the alignment step S40 of aligning the waveguide of the single mode optical cable 10 coupled to the V-groove 20 and the signal emission region 35 of the V-groove 20 is known.

The key point of the present invention is that the signal emitting region of the waveguide and the LD of the single mode optical cable 10 can be made easier than the conventional invention or technology. The V-groove 20 corresponding to the radius or diameter of the single mode optical cable, Grooves 20 are formed and a single mode optical cable is installed in the groove of the V-groove 20.

Referring to FIG. 2B, in the single mode optical cable 10 fabricated in the single mode optical cable fabrication step S10, a lens process is performed in which the end portion in the tapered direction of the waveguide is processed into a lens shape by heat treatment, Step S11). ≪ / RTI >

Referring to FIG. 4, the shape of the lens at the distal end of the single mode optical fiber produced from the lens processing step S11 can be known.

The lens shape of the end of the optical fiber thus manufactured minimizes the optical signal transmission loss by converging the signal emitted from the LD (signal emission region) in the form of divergent light.

Referring to FIG. 2C, in the single mode optical cable fabricated in the single mode optical cable fabrication step S10, the waveguide is cut at an angle of the end portion in the tapered direction, thereby reducing the return loss (S12) of cutting the end portion of the optical cable so that the end portion of the optical cable is cut off.

Referring to FIG. 7A, a cross-sectional view of the optical cable manufactured from the optical cable end cutting step S12, an alignment relationship between the LD and the waveguide, and the relationship between the LD and the LD driver mounted or mounted on the substrate can be known.

The return loss occurring in the optical signal transmission can be minimized by the sectional structure cut from the optical cable end cutting step S12.

In addition to the arrangement of the signal light emitting areas of the inner waveguide and the LD of the single mode optical cable shown in FIG. 5 according to the present invention, in the single mode optical cable manufactured in the single mode optical cable producing step S10, The cross-section of the end-to-end direction is an angled representation of the cut.

Referring to FIG. 6B, the multi-channel array type optical communication module is manufactured by using the method of aligning the signal light emitting region of the inner waveguide of the single mode optical cable and the LD.

As described above, the alignment method of the LD and the single mode optical cable according to the present invention and the method of fabricating the array type optical communication module using the method can simplify and simplify the alignment of the single mode optical cable and the LD, Cost and time can be drastically reduced.

Also, since the method of fabricating an array type optical communication module using the above alignment method is also simplified naturally, it is possible to reduce the manufacturing time and cost, miniaturize, and mass production.

Devices that can use the alignment method include optical communication-related optical transceivers, active optical cables (AOC), tunable laser sources, TOSA (Transmitter Subassemblies), and QSFP (Quad Small Form-factor Pluggable) It is possible to reduce manufacturing time and cost, miniaturize and mass production of these products.

S10: Single mode optical cable production step S11: Lens processing step
S12: Step of cutting end of optical cable
S20: V-groove making step S30: Joining step
S40: Sort step
10: Single mode optical cable 11: Waveguide
15: Fiber optic lens 20: V-groove
25: V groove 30: LD
35: signal emitting region 40: LD driver
50: substrate

Claims (5)

delete A single mode optical cable manufacturing step of fabricating a single mode optical cable by connecting a single mode optical cable and a multimode optical cable by a heat treatment or a discharge method so that a waveguide inside the optical cable is tapered;
A lens processing step of processing a distal end portion of the waveguide in a tapered shape in a single mode optical cable manufactured in the single mode optical cable manufacturing process into a lens shape using a heat treatment, a discharge or a laser processing method;
A V-groove having a V-shaped groove in which a single-mode optical cable fabricated in the single-mode optical cable fabrication step and a lens processing step is fixed is prepared. The V-groove has a value between 89 degrees and 91 degrees And the radius of the optical cable is D, the width of the V groove is

-

And the depth of the V-groove is

-

A V-groove fabrication step of fabricating a V-groove so as to have a value between the V-
Coupling the ends of the single-mode optical cable transversely to the V-grooves of the V-grooves; And
And aligning the signal light emitting region of the LD mounted on the substrate and the waveguide of the single mode optical cable coupled to the V-groove. A single mode optical cable manufacturing step of fabricating a single mode optical cable by tapering the waveguide inside the optical cable by connecting a single mode optical cable and a multimode optical cable by heat treatment or discharge;
A step of cutting a distal end portion of the waveguide in a tapered shape at an angle in a single mode optical cable fabricated in the single mode optical cable manufacturing step to eliminate a return loss caused when an optical signal is transmitted;
A V-groove having a V-shaped groove in which a single-mode optical cable fabricated in the single-mode optical cable fabrication step and a lens processing step is fixed is prepared. The V-groove has a value between 89 degrees and 91 degrees And the radius of the optical cable is D, the width of the V groove is

-

And the depth of the V-groove is

-

A V-groove fabrication step of fabricating a V-groove so as to have a value between the V-
Coupling the ends of the single-mode optical cable transversely to the V-grooves of the V-grooves; And
And aligning the signal light emitting region of the LD mounted on the substrate and the waveguide of the single mode optical cable coupled to the V-groove. delete A method of manufacturing a multi-channel array-type module, comprising: fabricating an optical communication module in the form of a multi-channel array using an alignment method according to claim 2 or claim 3;

Images