WO2017118271A1

WO2017118271A1 - Parallel transmission and reception optical module for dual-link transmission, and preparation method

Info

Publication number: WO2017118271A1
Application number: PCT/CN2016/110355
Authority: WO
Inventors: 胡百泉; 付永安; 刘成刚; 陈伟; 赵丹; 郑盼
Original assignee: 武汉电信器件有限公司
Priority date: 2016-01-07
Filing date: 2016-12-16
Publication date: 2017-07-13
Also published as: CN105759371B; CN105759371A

Abstract

A parallel transmission and reception optical module for dual-link transmission, and a preparation method. The transmission and reception optical module comprises a transmission optical device (103), a reception optical module (104), a PCB circuit board (102), and a data interface. The transmission optical device (103) consists of a first contact pin collimator (201) and a first tube assembly (202). The first contact pin collimator (201) comprises a first optical fiber interface (401), a single-mode contact pin (402), and a first collimation lens (403), all of which are sequentially coupled and fixed to the first contact pin collimator (201). The first tube assembly (202) comprises a wavelength division multiplexing assembly (405), a coupling lens group (406), and a laser chipset (407), all of which are sequentially coupled and fixed to the tube assembly. The reception optical module (104) consists of a second contact pin collimator (204) and a second tube assembly (205). The second contact pin collimator (204) comprises a second optical fiber interface (501), a multi-mode contact pin (502) and a second collimation lens (503), all of which are sequentially coupled and fixed on the second contact pin collimator (204). The second tube assembly (205) comprises a wavelength division demultiplexing assembly (504), an array lens (505) and a detector chipset (506), all of which are sequentially coupled and fixed to the tube assembly. The optical module has capabilities of transmission on a long-distance single-mode optical fiber and a short-distance multi-mode optical fiber, and has the characteristics of low costs, batch production and miniaturization. Also provided is a preparation method for the optical module.

Description

Parallel light-emitting module for dual-link transmission and manufacturing method thereof

Technical field

The present invention belongs to the field of optical communication technologies, and in particular, to a parallel receiving and emitting module for dual-link transmission and a manufacturing method thereof.

Background technique

Today's high-speed optical devices and optical modules for parallel transmission, such as QSFP+IR4, QSFP+LM4, QSFP+LR4, QSFP+28, etc., are for a certain application site, or an application link layer, such as the patent CN201210184192. 7, CN201310751180.2, US20120189314A1, etc., for long-distance single-mode link transmission; such as patent CN201410700394.1, CN201310164198.2, etc., for short-distance multi-mode link transmission. For different application sites or different application link layer requirements, such as long-distance single-mode links and short-distance multi-mode links, the optical devices or optical modules commonly used in the market are not compatible, and their performance cannot meet the requirements of optoelectronics at the same time. Indicators, or incompatibility of links, result in unstable photoelectric indicators and poor reliability.

For the transmitted link, long-distance single-mode links, such as 10Km links, its link characteristics are that the fiber transmission mode is the fundamental mode (there is a small number of polarization modes), the mode is stable, and the power is stable and smaller with increasing distance. For short-distance multi-mode links, such as 300m OM3 multimode links, which are used at 850nm, there are single-fiber and multi-fiber segments. The advantage is that multi-mode fiber and 850nm VCSEL laser mode are matched and coupled. The efficiency is high and the cost is low, but the disadvantage is that the mode is unstable, and the mode dispersion is severe, which is related to the way of laser injection, and the jitter of the optical fiber causes the optical power to jump.

The optical components of the link and its transmitting and receiving terminals are interconnected by connectors, such as flanges, LC standard card slots, MPO heads, etc. These connectors are optical interfaces and links of optical devices through precise mechanical positioning. The jumpers are docked. The optical port of the optical device usually has a SC-type pin, a plug-in LC type pin, a pigtail type pin, and the like. For the plug-in type optical port, the ceramic ferrule is included, and the ceramic ferrule is equipped with an optical fiber. From the length of the fiber, the fiber in the plug-in type optical port usually does not exceed 10 mm. For the link, whether it is a single-mode link or a multi-mode link, its fiber length is at least one hundred meters. From the mode of view, the fiber of the link is long enough to form a relatively stable transverse mode. For the plug-in type optical port, since the optical fiber is short, a stable transverse field cannot be formed at all. Therefore, there are six situations for single-mode link and multi-mode link interconnection. The first is the single-mode link to the multi-mode link; the second is the multi-mode link to the single-mode link. The third case is that the multimode pin is transmitted to the single mode link; the fourth case is that the multimode link is transmitted to the single mode pin; the fifth case is that the single mode pin is transmitted to the multimode link; Six cases are single mode links Transfer to multimode pins. For the first case, the problem is mainly the pattern mismatch, and the pattern mismatch causes at least two effects: introducing insertion loss, mode transition. For the second case, it is mainly to introduce power loss. For the third case, since the single-mode link length is sufficient and the mode field is stable, there is no mode problem, mainly introducing power loss. For the fourth case, the mode within the single mode pin is unstable due to the mode mismatch. In the fifth case, since the fiber length of the multimode link is sufficient, the spot emitted by the fiber substantially maintains the characteristics of the multimode fiber, and no special treatment is required. For the sixth case, the mode field in the multimode pin is unstable due to the mode mismatch. Corresponding to the four cases of the third to the sixth, when the coupling of the optical device is performed, corresponding processing is required. For the first, second and third cases, there are various processing methods, such as patents CN201320650821, CN201320272028, CN03810082, etc., for handling link level interconnections. For the fourth, fifth and sixth cases, the relevant patent descriptions have not been found.

For optical devices that are applied to both multimode links and single mode links, there are many problems in the interchange of links, such as the problem of power difference, that is, the same optical module, using single mode jumpers and adopting multimode. The difference in optical power output during jumper is large, up to 6dB when severe; such as multimode fiber jitter problem; such as high-speed signal distortion caused by multimode fiber mode dispersion, and so on. In order to realize a feasible and reliable optical module and optical device for dual-link transmission, the above problems must be solved.

Summary of the invention

An object of the present invention is to provide a parallel light-receiving module and a manufacturing method for dual-link transmission, so as to solve the problem that no parallel light-receiving module can be compatible with multi-mode fiber and single-mode fiber transmission in the prior art. problem.

The embodiment of the present invention is implemented as follows. On the one hand, an embodiment of the present invention provides a parallel receiving and emitting module for dual-link transmission, where the parallel receiving and emitting module includes a transmitting optical device, a receiving optical device, and a PCB circuit. Board and data interface, specific:

The light emitting device is composed of a first pin collimator and a first tube assembly; the first pin collimator includes a first fiber optic interface, a single mode pin and a first collimating lens, and the three are in turn Coupling and being fixed on the first pin collimator; the first package assembly includes a wavelength division multiplexing component, a coupling lens group and a laser chip set, the three are sequentially coupled and fixed on the package assembly ;

The receiving optical device is composed of a second pin collimator and a second tube assembly; the second pin collimator includes a second fiber optic interface, a multimode pin and a second collimating lens, the three in sequence Coupling and being fixed on the second pin collimator; the second package assembly includes a wave decomposition multiplexing component, an array lens and a detector chip set, the three are sequentially coupled and fixed on the package assembly ;

The emitting optical device and the receiving optical device are connected to the first data I/O port of the PCB circuit board, The data interface is connected to the second data I/O port of the PCB circuit board.

Preferably, the wavelength division multiplexing/demultiplexing component comprises a total reflection sheet, a glass bracket and a band pass filter set, wherein the total reflection sheet covers a working surface of the glass holder, and the surface is left on the working surface. / Light exit port, the band pass filter set covers the other working surface of the glass stand for transmitting light of a specified wavelength band.

Preferably, the first package assembly further includes an optical path turning element fixed between the first collimating lens and the wavelength division multiplexing component, and a turning angle thereof according to the wavelength division multiplexing component The angle between the receiving light plane and the laser light path is determined.

Preferably, the second package assembly further includes an aperture between the second collimating lens and the wave decomposition multiplexing component, a center point thereof and a central axis of the second collimating lens The light entrances of the wave demultiplexing components are on the same line.

Preferably, the first collimating lens and the second collimating lens specifically include: c-lens, G-lens, D-lens or an aspherical lens.

In another aspect, the embodiment of the present invention further provides a method for fabricating a parallel light-emitting module for dual-link transmission, which is assembled according to the parallel light-receiving module described in the first aspect and its preferred solution, wherein The process of assembling the first collimating lens and the coupling lens group further includes:

Customizing the first collimating lens such that the difference between the multimode coupled optical power and the single mode coupled optical power of each channel at the output port of the laser component is within a preset coupling tolerance range;

Test and statistics the average value of the maximum coupled optical power of the laser coupled to the single mode collimator in each channel, denoted as Ps1, Ps2, ..., Psn, where n is the number of lasers; test and statistically obtain each channel and multimode The average value of the maximum coupled optical power of the collimator coupling, denoted as Pm1, Pm2, ..., Pmn;

Assembling the laser and the coupling lens group, specifically: connecting the single mode jumper and the multimode jumper at the first fiber interface, and axially adjusting the first channel coupling lens, so that the first channel laser chip is output through the single mode jumper. The optical power P satisfies: A*Ps1<P<A*Pm1; the optical power P outputted by the first channel laser chip through the multimode jumper satisfies: A*Ps1<P<A*Pm1; wherein A is a proportional coefficient, 0<A<1; the adjustment of the n channel coupling lenses is completed in sequence; the coupling assembly of the emitting optical device is completed.

Preferably, the selection of the pupil in the receiving optical device is specifically:

The second pin collimator combined with the second collimator and the multi-mode pin has an output spot diameter D1 at a position of 30±5 mm, and the effective aperture of each filter in the wave demultiplexing module is D2, and D1 is located at [ Within the range of 0.5*D2-0.7*D2];

Confirming that the second pin collimator is connected to the multimode jumper, and the output spot diameter of the second pin collimator at the position of 30±5 mm is D3, wherein D3 is greater than D1;

Confirming that the second pin collimator is connected to the single mode jumper, and at this time, the second pin collimator has an output spot diameter D4 at a position of 30±5 mm, wherein D4 is greater than D1;

According to the D1, D3, and D4, the diaphragm of the appropriate material is selected, and the effective aperture diameter D5 of the design aperture is satisfied: D1 < D5 < D4 and D1 < D5 < D3.

Preferably, according to the position of each component completed by the coupling, and according to the position, each component point is marked in the subsequently produced emitting optical device and the receiving optical device for mass production and assembly.

In another aspect, an embodiment of the present invention further provides a method for using a parallel light-receiving module, the method applying the parallel light-receiving module according to the first aspect and the preferred embodiment thereof, including a first parallel light-emitting module and The second parallel receiving light module, specifically:

The first receiving optical device of the first parallel light receiving module is connected to the second light emitting device of the second parallel light receiving module through a single mode fiber;

The second receiving optical device of the second parallel light receiving module is connected to the first light emitting device of the first parallel light receiving module through a single mode fiber.

The first receiving optical device of the first parallel light receiving module is connected to the second light emitting device of the second parallel light receiving module through the multimode optical fiber;

The second receiving optical device of the second parallel light receiving module is connected to the first emitting optical device of the first parallel light receiving module through the multimode optical fiber.

Advantageous effects of a parallel light-receiving module and a manufacturing method for dual-link transmission provided by embodiments of the present invention include: the present invention proposes a parallel light-receiving module that can be used for dual links and an interconnection manner thereof, for dual-link Conventional single-mode long-distance transmission, without conversion, can be directly connected to single-mode fiber for short-distance multimode links. The built-in optical device adopts a conventional wavelength division multiplexing structure, the transmitting optical device adopts a single-mode pin collimator, and the receiving optical device adopts a multi-mode pin collimator; the same optical module can be realized with a single mode at a long distance. The ability to transmit optical fibers and short-distance multimode optical fibers is characterized by low cost, batch size, and miniaturization.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. Some embodiments, for those of ordinary skill in the art, do not pay for creativity Further drawings can also be obtained from these drawings.

1 is a schematic structural diagram of a parallel receiving and receiving module for dual link transmission according to an embodiment of the present invention;

2 is a schematic structural diagram of a light emitting device used in a parallel light receiving module according to an embodiment of the present invention;

3 is a schematic structural diagram of a receiving optical device used in a parallel light receiving module according to an embodiment of the present invention;

4 is a schematic structural diagram of a wavelength division multiplexing/demultiplexing component used in a parallel light receiving module according to an embodiment of the present invention;

FIG. 5 is a flowchart of completing lens coupling in a parallel light-receiving module for dual-link transmission according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of a connection structure for dual link transmission according to an embodiment of the present invention; FIG.

7 is a schematic diagram of an optical path of a light emitting device in a parallel light receiving module according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of an optical path of a receiving optical device in a parallel light receiving module according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.

Embodiment 1

FIG. 1 is a parallel light-receiving module for dual-link transmission according to the present invention. The parallel light-emitting module includes a light-emitting device 103, a receiving optical device 104, a PCB circuit board 102, and a data interface. (not shown in the figure), specific:

As shown in FIG. 2, the light emitting device is constituted by a first pin collimator 201 and a first package assembly 202; the first pin collimator 201 includes a first fiber optic interface 401, a single mode pin 402 and a first collimating lens 403, which are sequentially coupled and fixed to the first pin collimator 201; the first package assembly 202 includes a wavelength division multiplexing component 405, a coupling lens group 406, and a laser chipset 407, which in turn is coupled and fixed to the package assembly 202;

As shown in FIG. 3, the receiving optical device is constituted by a second pin collimator 204 and a second package assembly 205; the second pin collimator 204 includes a second fiber optic interface 501, a multimode pin 502 and a second collimating lens 503, which are sequentially coupled and fixed to the second pin collimator 204; the second tube The shell assembly 205 includes a wave decomposition multiplexing component 504, an array lens 505, and a detector chipset 506, which are sequentially coupled and fixed to the package assembly;

The transmitting optical device 103 and the receiving optical device 104 are connected to a first data I/O port (not shown) of the PCB circuit board 102, and the data interface is connected to the second data I of the PCB circuit board 102. /O port (not shown).

The embodiments of the present invention propose a parallel receiving and receiving module that can be used for dual links. For conventional single-mode long-distance transmission in dual links, no conversion is needed, and single-mode fiber interconnection can be directly used, for short-distance multi-mode links. . The built-in optical device adopts a conventional wavelength division multiplexing structure, the transmitting optical device adopts a single-mode pin collimator, and the receiving optical device adopts a multi-mode pin collimator; the same optical module can be realized with a single mode at a long distance. The ability to transmit optical fibers and short-distance multimode optical fibers is characterized by low cost, batch size, and miniaturization.

In conjunction with the embodiment of the present invention, the wavelength division multiplexing/demultiplexing component has an implementation manner, as shown in FIG. 4, specifically, a total reflection sheet 601, a glass bracket 602, and a band pass filter group 603, wherein The total reflection sheet 601 covers the working surface 604 of the glass holder 602, and has an inlet/exit port 605 on the working surface. The band pass filter group 603 covers the other working surface 606 of the glass holder for transmitting the specified wavelength band. Light. In Fig. 4, a schematic diagram of a structure including four sub-filters is given, and a filter optical path effect is schematically shown.

In conjunction with the embodiments of the present invention, there is a preferred implementation, wherein the first package assembly 202 further includes an optical path turning element 404, the optical path turning element 404 being fixed to the first collimating lens 403 and wave Between the sub-multiplexing components 405, the turning angle is determined according to the angle between the optical plane (i.e., the surface of the band pass filter group 603) received by the wavelength division multiplexing component 405 and the optical path of the laser 407.

In conjunction with the embodiments of the present invention, there is a preferred implementation, wherein the second package assembly 205 further includes an aperture 509, and the aperture 509 is located at the second collimating lens 503 and the wave decomposition multiplexing component 504. The center point of the aperture 509 is on the same line as the central axis of the second collimating lens and the light entrance of the demultiplexing multiplexer.

In various embodiments of the present invention, the first collimating lens and the second collimating lens specifically include: c-lens, G-lens, D-lens or an aspherical lens.

Embodiment 2

The embodiment of the present invention further provides a method for manufacturing a parallel light-emitting module for dual-link transmission, which is assembled according to the parallel light-receiving module according to the first embodiment, wherein, as shown in FIG. The process of a collimating lens 403 and a coupling lens group 406 further includes:

In step 201, the first collimating lens 403 is customized such that the difference between the multimode coupled optical power and the single mode coupled optical power of the respective channels at the output port of the laser assembly 407 is within a preset coupling tolerance range. The tolerance range can refer to the industrial parameter specifications of each device, and will not be repeated here.

In step 202, the average value of the maximum coupled optical power coupled between the laser of each channel and the single mode collimator 402 is tested and counted, and is denoted as Ps1, Ps2, ..., Psn, where n is the number of lasers; test and statistics The average value of the maximum coupled optical power coupled to each channel and the multimode collimator is obtained, denoted as Pm1, Pm2, ..., Pmn.

In step 203, the laser and the coupling lens group are assembled. Specifically, a single mode jumper and a multimode jumper are respectively connected at the first fiber interface 401, and the first channel coupling lens is axially adjusted, so that the first channel laser chip passes. The optical power P of the single-mode jumper output satisfies: A*Ps1<P<A*Pm1; the optical power P output by the first-channel laser chip through the multi-mode jumper satisfies: A*Ps1<P<A*Pm1; , A is the proportional coefficient, 0 < A < 1;

In actual operation, especially when testing optical power for multimode jumpers, in order to avoid interference of higher-order modes. Preferably, the multimode jumper is connected at the optical port of the light emitting device and the multimode jumper is wound 3-10 turns, the fiber diameter is 15-30 mm (to weaken the interference of the high order mode), and then coupled to Taking the first channel as an example, the first channel collimating coupling lens is axially adjusted, so that the optical power P output by the first channel laser chip through the multimode jumper satisfies: A*Ps1<P<A*Pm1, and A is a proportional coefficient. 0<A<1, depending on different power requirements.

In step 204, the adjustment of the n channel coupling lenses is completed in sequence; the coupling assembly of the emitting optical device is completed.

In the embodiment of the present invention, for the pin collimator 201, the end face of the single mode pin 402 is located near the focus of the collimator lens 403, so the pin collimator 201 can output parallel light, and can also receive parallel light with high efficiency. . For the coupling lens group 406, the laser chip 407 is located near the focus of the coupling lens group 406, and thus the light wave emitted from the laser chip 407 passes through the coupling lens 406 to form parallel light. The dual lens coupling method of the collimating lens 403 and the coupling lens group 406 selects a suitable lens combination to achieve high coupling efficiency. At the same time, for the pin collimator 201, the collimating lens adopts a lens with a small numerical aperture, and the parallel light formed by the laser chip 407 after passing through the lens group 406 can be received by the collimating lens 403. Less than or equal to the numerical aperture angle of the pin 402 to achieve large coupling efficiency. Since the numerical aperture angle of the multimode fiber is larger than the numerical aperture angle of the single mode fiber, the lens applied to the single mode pin collimator is also suitable for multimode fiber transmission. Thereby, the compatibility of the emitting optical device for the single mode fiber patch cord and the multimode fiber patch cord is achieved.

On the receiving optical device side, in order to solve the multimode fiber jitter problem, effectively reduce the dispersion problem caused by the high-order mode of the multimode fiber, and reduce the spot spread problem caused by the high-order mode in the single-mode pin when the multimode link is transmitted to the single-mode pin. The embodiment of the present invention provides a scalable solution, wherein the selection of the aperture in the receiving optical device is specifically:

The expansion scheme utilizes a short multimode pin at the same time, and the parallel light output by the pin collimator at the optical port of the device can effectively reduce the spot change caused by the instability of the module when the single mode link is transmitted to the multimode pin. .

The focus of the embodiments of the present invention is to provide a method for setting each component in the parallel light receiving module, including: a first collimating lens 403, a coupling lens group 406, a laser 407, a second collimating lens group 503, and an array lens. 505 and detector chip 506 and so on. However, as a mass production and installation, the embodiment of the present invention further provides an alternative, that is, according to the position of each component completed by the coupling, and the subsequent generation of the light emitting device and the receiving optical device according to the position. The points of each component are marked for mass production and assembly.

Embodiment 3

The embodiment of the present invention provides a method for using a parallel light-receiving module. The method includes the parallel light-receiving module according to the first embodiment, and includes a first parallel light-emitting module and a second parallel light-emitting module.

Embodiment 4

Embodiments of the present invention provide a method for using a parallel light receiving module, and the method is applied and implemented. The parallel light receiving module of the first embodiment includes a first parallel light receiving module and a second parallel light receiving module, specifically:

Embodiment 5

The embodiment of the present invention is further described by taking a device composed of a four-channel laser component and a four-channel detector component for CWDM, wherein the working wavelength adopts four common wavelengths of CWDM: λ ₁ , λ ₂ , λ _{3 ,} and λ. ₄ , such as 1271nm, 1291nm, 1311nm and 1331nm. The optical module can be in the form of QSFP+IR4, QSFP+LM4, QSFP+LR4, QSFP28, PSM4, CFP2, CFP4, etc. For the convenience of the description, the QSFP+LR4 package form is taken as an example for description.

As shown in FIG. 1-3, the optical module includes a housing 101, a PCB board 102, an emitting optical device 103, and a receiving optical device 104. The light emitting device 103 includes a pin collimator 201, a package assembly 202, and a flexible tape 409. The receiving optical device 104 includes a pin collimator 204, a package assembly 205, and a flexible tape 508. The light emitting device 103 and the receiving optical device 104 are connected to the PCB 102 via a flexible tape 203 and a flexible tape 508, respectively. The light-emitting device 103 and the light-receiving device 104 may be hermetically sealed or may be non-hero-sealed.

The optical port of the light emitting device 103 adopts a pluggable pin collimator 201, and the pin collimator 201 and the tube and shell assembly 202 are fixed by laser welding, and the connection manner of the tube and shell assembly 202 and the flexible tape 203 is different according to the tube case. The package is different. For the hermetic package, the flexible tape 203 is located outside the package assembly 202 and is cured by soldering. For the non-hermetic package, one end of the flexible tape 203 is embedded in the inside of the package assembly 202, and is soldered or has a good sealing effect. Heat curing adhesive is fixed.

Similar to the light-emitting device 103, the optical port of the receiving optical device 104 is a pluggable pin collimator 204, the pin collimator 204 is fixed to the package assembly 205 by laser welding, and the package assembly 205 and the flexible tape 508 The connection manner varies according to different packages of the package. For the hermetic package, the flexible tape 508 is located outside the package assembly 205 and is cured by soldering. For the non-hermetic package, one end of the flexible tape 508 is embedded in the inside of the package assembly 205, and is soldered. Or a thermosetting adhesive with a good sealing effect.

Different connection modes of the optical module and the optical module, the corresponding components of the optical device are different, and the link components are different. In order to realize the function of transmitting a single-mode link and a multi-mode link, there are various options for connecting the optical module to the optical module. An application example is described below.

For convenience of explanation, for the description of the drawings, there are orientation words, such as above, below, before, after, after, The right vocabulary is based on the drawing of the patent document, and the line of sight is perpendicular to the plane of view of the paper, with reference to the reader's body orientation.

The embodiments are not intended to limit the scope of the present invention, and the structural, method, or functional changes made by those skilled in the art in accordance with the embodiments are included in the scope of the patent.

Example 1): The link between the optical module and the optical module is only the transmission fiber, and there is no switching component.

As shown in FIG. 6, the two optical modules that communicate with each other are connected: whether for a long-distance single-mode link or a short-distance multimode fiber link, the optical modules are directly connected through the transmission fiber. The main components of the optical path include: receiving

optical devices

301, 304, transmitting

optical devices

302, 303, and transmitting

optical fibers

305, 306, wherein the transmitting optical device 303 is in communication with the receiving optical device 301, and the transmitting optical device 302 is in communication with the receiving optical device 304. According to different applications, the

transmission fibers

305 and 306 may be long-distance single-mode fibers or switched to short-distance multimode fibers. Since the optical modules can be compatible with both multimode fibers and single-mode fibers, in practical applications, Only the transmission fiber can be switched according to different applications. For example, a metropolitan area network can use long-distance single-mode fiber links, and a data center uses short-distance multimode fiber links. Both applications can use the same optical module.

For the optical device, the characteristics of the single-mode link and the multi-mode link are adopted, and the light-emitting device in the optical module adopts a single-mode pin at the optical port, and the structure of the double-lens parallel optical path is adopted inside the light-emitting device to realize the optical device. High coupling efficiency, to reduce the difference in optical power caused by the interchange of single-mode fiber and multi-mode fiber, and to adopt the necessary coupling measures (the method is described in the second embodiment, not repeated here), reducing single mode The power change when the pin is transmitted to the multimode optical fiber; for the receiving optical device in the optical module, the optical port adopts a multimode pin, and at the same time, the structure of the double optical lens parallel light path is received inside the optical device, and the optical aperture is set in the device. It can effectively solve the multimode fiber jitter problem, effectively reduce the dispersion problem caused by the high-order mode of the multimode fiber, and effectively reduce the spot spread problem caused by the high-order mode in the single-mode pin when the multimode link is transmitted to the single-mode pin. Using a short multimode pin, the parallel light output from the pin collimator at the optical port of the device can effectively reduce the instability of the module when the single mode link is transmitted to the multimode pin. Changes from the spot. Therefore, the optical device and the optical module can be simultaneously applied to a single mode link and a multimode link.

Corresponding transmitting

optical devices

302, 303, whose internal structure is distributed as shown in FIG. 4, in order, are LC optical port 401, single mode pin 402, collimating lens 403, optical path turning element 404, wavelength division multiplexing component 405. Coupling lens group 406, laser chip set 407, package 408, and flexible tape 409. The LC optical port 401, the single mode pin 402, and the collimating lens 403 are assembled into a single mode pin collimator 201; the optical path turning element 404, the wavelength division multiplexing component 405, the coupling lens group 406, the laser chip set 407, and the package The 408 is assembled into a package assembly 202. The collimating lens 403 includes but is not limited to: c-lens, G-lens, D-lens, and Aspherical lens. The wavelength division multiplexing component 405 may be a combination of a plurality of filters, a combination of polarization combining elements, or a combination of a polarization combining element and a filter. The single-mode pin collimator 201 can have a built-in isolator. The reason why the single-mode pin is used can ensure the high coupling efficiency of the laser on the one hand, and facilitate the transmission of the optical signal on the long-distance single-mode link on the other hand.

With the pin collimator 201, the end face of the single mode pin 402 is located near the focus of the collimator lens 403, so the pin collimator 201 can output parallel light, and can also receive parallel light with high efficiency. For the coupling lens group 406, the laser chip 407 is located near the focus of the coupling lens group 406, and thus the light wave emitted from the laser chip 407 passes through the coupling lens 406 to form parallel light. The dual lens coupling method of the collimating lens 403 and the coupling lens group 406 selects a suitable lens combination to achieve high coupling efficiency. At the same time, for the pin collimator 201, the collimating lens adopts a lens with a small numerical aperture, and the parallel light formed by the laser chip 407 after passing through the lens group 406 can be received by the collimating lens 403. Less than or equal to the numerical aperture angle of the pin 402 to achieve large coupling efficiency. Since the numerical aperture angle of the multimode fiber is larger than the numerical aperture angle of the single mode fiber, the lens applied to the single mode pin collimator is also suitable for multimode fiber transmission.

Inside the device, for the package assembly 202, the laser chipset 407 is placed adjacent to the flexible tape 409 for electrical interconnection. The left side of the laser chipset 407 is mounted with a coupling lens group 406, and the laser chip 407 is located near the focus of the coupling lens group 406. The wavelength division multiplexing component 405 is mounted on the left side of the coupling lens 406 to realize wavelength division multiplexing of four parallel optical waves into one parallel light. Due to the limitation of the module structure, the position of the pin collimator 201 relative to the package is misaligned, and is offset by the optical path turning element 404. Therefore, the optical path turning element 404 is located on the left side of the wavelength division multiplexing component 405, and the envelope 408 is open. On the right side of the window, the pin collimator 201 is in contact with the light passing window of the envelope 408 and is fixed by laser welding.

Corresponding receiving

optical devices

301, 304, whose internal structure is distributed as shown in FIG. 5, are in order, LC optical port 501, multimode pin 502, collimating lens 503, wave decomposition multiplexing component 504, array lens 505 The detector chipset 506, the envelope 507, and the flexible tape 508. The LC optical port 501, the multimode pin 502, and the collimating lens 503 are assembled into a multimode pin collimator 204. Collimating lens 503 includes, but is not limited to, c-lens, G-lens, D-lens, and aspherical lenses. Wave decomposition multiplexing component 504, array lens 505, detector chipset 506, and package 507 form a package assembly 205. The wavelength division multiplexing component 504 may be a combination of a plurality of filters, a combination of polarization combining elements, or a combination of a polarization combining element and a filter.

For the pin collimator 204, the end face of the multimode pin 502 is located near the focus of the collimating lens 503, so the pin collimator 204 can output parallel light. For array lens 505, detector chip 506 is located The vicinity of the focus of the array lens 505. The dual lens coupling method of the collimating lens 503 and the array lens 505 selects a suitable lens combination to achieve high coupling efficiency. At the same time, for the pin collimator 204, the collimating lens adopts a lens with a large numerical aperture, so that the spot of the numerical aperture of the multimode fiber can pass through the collimating lens 503 with high coupling efficiency, and the multimode parallel light formed thereafter. . Since the numerical aperture angle of a multimode fiber is larger than the numerical aperture angle of a single mode fiber, the lens applied to the multimode pin collimator is also suitable for transmission of a single mode fiber.

The device further includes an aperture 509, which may be disposed at the port of the pin collimator 204, or may be disposed at the light passing window of the package assembly 205, or may be disposed at the light passing port of the wave decomposition multiplexing component 504. Whereas, it may be disposed at the image focal plane of the collimating lens 503, or the aperture of the filter element or the polarization beam splitting component or other components of the wavelength division multiplexing component may be limited to achieve the effect of the pupil, or It is disposed near the surface of the array lens 505. The role of the aperture is to limit the spot mode caused by the higher order mode field transmitted in the multimode link. The multi-mode pin collimator 204 is used at the optical port to ensure the high coupling efficiency of the detector. In combination with the optical yoke, the multi-mode fiber jitter can be reduced, and the spot spread caused by the high-order mode in the multi-mode link can be reduced. problem. For the size selection of the aperture, refer to the method described in the second embodiment, and details are not described herein.

The optical path propagation mode of the corresponding light-emitting

devices

302, 303 is as shown in FIG. The laser chipset 407 is located near the object focus of the coupling lens group 406, and the four wavelength optical signals emitted by the coupling lens group 406 are coupled to form quasi-parallel light, and then combined into a beam of light by the wavelength division multiplexing component 405. Thereafter, it is received by the collimator lens 403 in the pin collimator 201 after being deflected by the optical path turning element 404, and then concentrated and transmitted inside the pin 402.

The optical path propagation mode of the corresponding receiving

optical devices

301, 304 is as shown in FIG. The light path is slightly different depending on the position of the aperture 509, and the light is disposed at the light passing window of the envelope 507 as an example. The light wave transmitted by the link forms parallel light through the pin collimator 204, and then enters the inside of the envelope 507, and then reaches the aperture, which acts as a limiting effect on the side mode of the spot, allowing only slightly larger than the size of the fundamental mode field. The beam passes, after which the beam reaches the wave decomposition multiplexing element 504, which is split into four different wavelengths of light waves for independent propagation, then reaches the array lens 505, which is then concentrated to the detector chip set 506, thereby forming a current output.

The invention proposes a parallel light-receiving module which can be used for dual-links and an interconnection manner thereof. For conventional single-mode long-distance transmission in a dual link, no conversion is needed, and single-mode optical fiber interconnection can be directly used, for a short distance Mode link. The built-in optical device adopts a conventional wavelength division multiplexing structure, the transmitting optical device adopts a single-mode pin collimator, and the receiving optical device adopts a multi-mode pin collimator; the same optical module can be realized. The ability to transmit long-distance single-mode fiber and short-distance multimode fiber has the characteristics of low cost, batch size, and miniaturization.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A parallel light-emitting module for dual-link transmission, characterized in that the parallel light-receiving module comprises a light-emitting device, a light-receiving device, a PCB circuit board and a data interface, and specifically:

The light emitting device is composed of a first pin collimator and a first tube assembly; the first pin collimator includes a first fiber optic interface, a single mode pin and a first collimating lens, and the three are in turn Coupling and being fixed on the first pin collimator; the first package assembly includes a wavelength division multiplexing component, a coupling lens group and a laser chip set, the three are sequentially coupled and fixed on the package assembly ;

The receiving optical device is composed of a second pin collimator and a second tube assembly; the second pin collimator includes a second fiber optic interface, a multimode pin and a second collimating lens, the three in sequence Coupling and being fixed on the second pin collimator; the second package assembly includes a wave decomposition multiplexing component, an array lens and a detector chip set, the three are sequentially coupled and fixed on the package assembly ;

The light emitting device and the receiving optical device are connected to a first data I/O port of the PCB circuit board, and the data interface is connected to a second data I/O port of the PCB circuit board.
The parallel light-receiving module according to claim 1, wherein the wavelength division multiplexing/demultiplexing component comprises a total reflection sheet, a glass holder and a band pass filter set, wherein the total reflection sheet covers the glass holder A working surface, and an entrance/exit port is left on the working surface, and a band pass filter group covers another working surface of the glass frame for transmitting light of a specified wavelength band.
The parallel light-emitting module according to claim 1 or 2, wherein the first package assembly further comprises an optical path turning element, the optical path turning element being fixed to the first collimating lens and wavelength division multiplexing Between the components, the turning angle is determined according to the angle between the receiving light plane of the wavelength division multiplexing component and the laser light path.
The parallel light-emitting module according to claim 1 or 2, wherein the second package assembly further comprises an aperture, the aperture being located between the second collimating lens and the wave decomposition multiplexing component, The center point is on the same line as the central axis of the second collimating lens and the light entrance of the demultiplexing multiplexer.
The parallel light-emitting module according to any one of claims 1 to 4, wherein the first collimating lens and the second collimating lens specifically comprise: c-lens, G-lens, D-lens or non- Ball lens.
A method for fabricating a parallel light-emitting module for dual-link transmission, characterized in that the parallel light-receiving module according to any one of claims 1-5 is assembled, wherein the first collimating lens and the coupling are assembled The lens group process also includes:

Customizing the first collimating lens such that the difference between the multimode coupled optical power and the single mode coupled optical power of each channel at the output port of the laser component is within a preset coupling tolerance range;

Test and statistics the average value of the maximum coupled optical power of the laser coupled to the single mode collimator in each channel, denoted as Ps1, Ps2, ..., Psn, where n is the number of lasers; test and statistically obtain each channel and multimode The average value of the maximum coupled optical power of the collimator coupling, denoted as Pm1, Pm2, ..., Pmn;

Assembling the laser and the coupling lens group, specifically: connecting the single mode jumper and the multimode jumper at the first fiber interface, and axially adjusting the first channel coupling lens, so that the first channel laser chip is output through the single mode jumper. The optical power P satisfies: A*Ps1<P<A*Pm1; the optical power P outputted by the first channel laser chip through the multimode jumper satisfies: A*Ps1<P<A*Pm1; wherein A is a proportional coefficient, 0<A<1; the adjustment of the n channel coupling lenses is completed in sequence; the coupling assembly of the emitting optical device is completed.
The method for fabricating a parallel light-emitting module according to claim 6, wherein the selection of the pupil in the receiving optical device is specifically:

The second pin collimator combined with the second collimator and the multi-mode pin has an output spot diameter D1 at a position of 30±5 mm, and the effective aperture of each filter in the wave demultiplexing module is D2, and D1 is located at [ Within the range of 0.5*D2-0.7*D2];

Confirming that the second pin collimator is connected to the multimode jumper, and the output spot diameter of the second pin collimator at the position of 30±5 mm is D3, wherein D3 is greater than D1;

Confirming that the second pin collimator is connected to the single mode jumper, and at this time, the second pin collimator has an output spot diameter D4 at a position of 30±5 mm, wherein D4 is greater than D1;

According to the D1, D3, and D4, the diaphragm of the appropriate material is selected, and the effective aperture diameter D5 of the design aperture is satisfied: D1 < D5 < D4 and D1 < D5 < D3.
The method for fabricating a parallel light-emitting module according to claim 6 or 7, wherein each of the emitted optical device and the receiving optical device is subsequently marked according to the position of each component that is coupled and according to the position Component points for mass production and assembly.
A method for using a parallel light-emitting module, wherein the method uses the parallel light-receiving module according to any one of claims 1-5, comprising a first parallel light-emitting module and a second parallel light-emitting module, :

The first receiving optical device of the first parallel light receiving module is connected to the second light emitting device of the second parallel light receiving module through a single mode fiber;

The second receiving optical device of the second parallel light receiving module is connected to the first light emitting device of the first parallel light receiving module through a single mode fiber.
A method for using a parallel light-emitting module, wherein the method uses the parallel light-receiving module according to any one of claims 1-5, comprising a first parallel light-emitting module and a second parallel transceiver Optical module, specific:

The first receiving optical device of the first parallel light receiving module is connected to the second light emitting device of the second parallel light receiving module through the multimode optical fiber;

The second receiving optical device of the second parallel light receiving module is connected to the first emitting optical device of the first parallel light receiving module through the multimode optical fiber.