CN109143595B - Splitter, multimode laser testing component and optical module testing system - Google Patents
Splitter, multimode laser testing component and optical module testing system Download PDFInfo
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- CN109143595B CN109143595B CN201810842353.4A CN201810842353A CN109143595B CN 109143595 B CN109143595 B CN 109143595B CN 201810842353 A CN201810842353 A CN 201810842353A CN 109143595 B CN109143595 B CN 109143595B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/106—Beam splitting or combining systems for splitting or combining a plurality of identical beams or images, e.g. image replication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
Abstract
The invention provides a multi-mode laser testing component, which is characterized by at least comprising: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet; the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuating glass sheet is arranged between the input port and the lens, and the non-attenuating glass sheet is arranged between the output port and the lens, so that the optical path of the output port is completely symmetrical to the optical path of the input port, and the transmission phases of signal light in input and output optical fibers are consistent. The invention provides a multi-mode laser testing component which is low in cost, accurate in testing, convenient and feasible, and is used for meeting the testing requirements of products of the type.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a splitter, a multimode laser testing component and an optical transceiver module testing system.
Background
With the rapid development of communication and internet, video services and search services with large data volume are rapidly increasing, and the market of supercomputers and storage-based data centers is greatly driven. In short-distance interconnection application, VCSEL (Vertical Cavity Emitting Laser) chips are widely applied and popularized with the advantages of high speed, high parallel density, low power consumption and the like.
The transmission module based on the VCSEL chip uses the multimode optical fiber to build a transmission system, so that the coupling assembly process of the optical device is simple, and the coupling efficiency is improved. It is clear that the large core diameter of a multimode optical fiber will carry different light source injection modes, with different modes propagating in the fiber having different paths or phases. The splitter and the attenuator which are applied in the conventional test of the optical module not only change the amplitude of an optical signal, but also change the phase of the optical signal, so that the test result is distorted. On the other hand, more mode injections, especially the injection of a large number of high-order modes, not only increase modal dispersion, but also increase the connection loss and generate noise signals due to bending distortion, which seriously affect normal use. Therefore, the test of multimode fiber laser components and optical modules draws more and more attention in the industry, and the encleard flux test equipment developed by arden corporation and pk corporation in the united kingdom can better test the injection mode of the light source, but the high cost and the complicated operation are not beneficial to popularizing mass production, thereby limiting the specification and the uniformity of the multimode optical transceiver module.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the existing multimode optical transceiver module test equipment and scheme, and provide a splitter, a multimode laser test component and an optical transceiver module test system which are low in cost, accurate in test, convenient and feasible, so as to meet the test requirements of the products.
To solve the above technical problem, embodiments of the present invention provide the following technical solutions:
in one aspect, an optical splitter is provided, which at least includes:
the optical fiber laser comprises an optical input port, two optical output ports, a first lens and a second lens which are arranged between the input port and the output port and have the same specification, a light splitting piece and a glass slide which have the same thickness;
wherein the input port is placed at twice the focal length of the first lens;
the light splitting sheet is arranged between the first lens and the input port;
the first output port is arranged at the position of twice the focal length of the other side, opposite to the input port, of the first lens;
the glass slide is arranged between the first lens and the first output port, so that the optical paths at two ends of the first lens are completely symmetrical;
the second output port is arranged at twice of the focal length of the second lens, so that the optical path of the second output port and the optical path of the input port are completely symmetrical about the second lens in imaging in the light splitting sheet;
the optical path of the first output port and the optical path of the second output port are respectively completely symmetrical to the optical path of the input port, so as to ensure that the phase distribution of the cross section of the signal in the optical path entering the output port is equal to the optical path entering the input port.
Preferably, the light splitting sheet is a glass slide plated with a semi-reflecting and semi-permeable film.
In one aspect, an optical splitter is further provided, where the optical splitter includes at least: one optical input port and two optical output ports;
the optical fiber access end face at the input port and the optical fiber access end face at the first output port are both ground to form an inclination angle of a preset numerical value, and the optical fiber access end at the input port is plated with a light splitting film to ensure that the optical fiber at the input port is in seamless butt joint with the optical fiber at the first output port.
Preferably, the preset value is 30 °, and the splitting ratio of the splitting film is 3 dB.
In one aspect, a multimode laser testing assembly is provided, where the multimode laser testing assembly at least includes: the optical splitter, the mode winding device, the detector and the screening module are arranged in the optical fiber;
wherein the mode winder is arranged at the first output port or the second output port; the first output port and the second output port are respectively provided with a first detector and a second detector, and the screening module screens the distribution of the optical fiber injection modes of the multimode optical module light source by comparing the optical power difference received by the first detector and the second detector.
In one aspect, a multimode laser testing assembly is provided, where the multimode laser testing assembly at least includes: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet;
the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuating glass sheet is arranged between the input port and the lens, and the non-attenuating glass sheet is arranged between the output port and the lens, so that the optical path of the output port is completely symmetrical to the optical path of the input port, and the transmission phases of signal light in input and output optical fibers are consistent.
In one aspect, a multimode laser testing assembly is provided, where the multimode laser testing assembly at least includes: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet;
the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuation glass sheet is arranged between the input port and the lens, a partition progressive reflecting film is plated on the attenuation glass sheet, and the attenuation-free glass sheet is arranged between the output port and the lens and used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multi-mode laser.
In one aspect, a system for testing a multimode optical transceiver module is provided, including: the optical splitter is used for measuring the return loss of the multimode laser module, and the optical splitter is used for measuring the return loss of the multimode laser module;
the test system obtains light splitting without changing signal mode distribution through the optical splitter;
the screening module is used for screening the distribution of the mode of injecting the multimode optical module light source into the optical fiber;
the attenuator is used for reducing the optical power to a target value on the premise of ensuring that the transmission phase of the signal light in the input optical fiber and the output optical fiber is not changed;
the return loss adjustable module is used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multimode laser;
the display module is used for displaying the output end power in the screening module and screening by comparing the difference value between the two paths of output end power.
In one aspect, a system for testing a multimode optical transceiver module is provided, including: the optical splitter is used for measuring the return loss of the multimode laser module, and the optical splitter is used for measuring the return loss of the multimode laser module;
the test system obtains light splitting without changing signal mode distribution through the optical splitter;
the screening module is used for screening the distribution of the mode of injecting the multimode optical module light source into the optical fiber;
the attenuator is used for ensuring that the transmission phases of signal light in input and output optical fibers are consistent;
the return loss adjustable module is used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multimode laser;
the display module is used for displaying the output end power in the screening module and screening by comparing the difference value between the two paths of output end power.
The embodiment of the invention has the following beneficial effects:
in the above scheme, the test system provided by this embodiment improves the signal phase and the mode energy distribution of the transmission optical signal on the transverse cross section without being changed, and provides the optical splitter and the multimode laser module which do not change the signal phase of the light source and the mode energy distribution of the transmission optical signal on the transverse cross section, so as to ensure the authenticity of the test result. The invention overcomes the defects of the existing multimode optical transceiver module test equipment and scheme, and provides a splitter, a multimode laser test component and an optical transceiver module test system which are low in cost, accurate in test, convenient and feasible, so as to meet the test requirements of the products.
Drawings
Fig. 1 is a schematic structural diagram of an optical splitter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another optical splitter according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a multimode laser test assembly according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of another multi-mode laser test assembly according to the fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a multimode optical transceiver module test system according to a fifth embodiment and a sixth embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Most common splitters in the market at present are tapered structures, optical signals are divided into two parts through a tapered section of an optical fiber and then are coupled into branches respectively, the split light from a tapered surface not only divides the signal amplitude into two parts, but also divides the transverse phase distribution into two parts, and the phase distribution of an original module is changed seriously, so that the test of sensitivity and transmission loss is influenced in the actual use process, the test value is about 2dB less than the target value, and the test process is unstable; the attenuator is mostly realized by a collimating lens-optical filter combination-converging lens, but a Gaussian beam signal with a certain waist spot diameter cannot form a parallel beam after passing through the collimating lens, and the phase cannot be restored through the converging lens after being transmitted for a certain distance, so that the signal phase distribution is changed, light sources distributed in different modes are caused, and after being attenuated by a fixed attenuation value, the attenuation difference is huge, and the accuracy of the test is influenced.
Example one
Fig. 1 is a schematic structural diagram of an optical splitter according to an embodiment of the present invention. In order to solve the problem that it is difficult for an optical splitter to implement unchanged phase distribution of a light source signal in the prior art, an embodiment of the present invention provides an optical splitter, which at least includes:
the optical fiber laser comprises an optical input port, two optical output ports, a first lens and a second lens which are arranged between the input port and the output port and have the same specification, a light splitting piece and a glass slide which have the same thickness; wherein the input port is placed at twice the focal length of the first lens; the light splitting sheet is arranged between the first lens and the input port; the first output port is arranged at the position of twice the focal length of the other side, opposite to the input port, of the first lens; the glass slide is arranged between the first lens and the first output port, so that the optical paths at two ends of the first lens are completely symmetrical; the second output port is arranged at twice of the focal length of the second lens, so that the optical path of the second output port and the optical path of the input port are completely symmetrical about the second lens in imaging in the light splitting sheet; the optical path of the first output port and the optical path of the second output port are respectively completely symmetrical to the optical path of the input port, so as to ensure that the phase distribution of the cross section of the signal in the optical path entering the output port is equal to the optical path entering the input port.
Preferably, the input fiber 101 at the optical input port is placed at the 2F focus of the first lens 103, while a 3dB splitter 102 is placed between the input fiber 101 and the first lens 103, preferably by plating a semi-reflective semi-transparent film on a glass slide. For the transmission output branch, the output fiber 105 at the first output port is placed at the rear 2F focus of the first lens 103, and a glass slide 104 is placed in the middle of the two, wherein the glass slide 104 and the 3dB splitting sheet 102 are equal in thickness, so that the optical paths at both ends of the first lens 103 are completely symmetrical. For the reflected output branch, the output fiber 107 at the second output port is placed at the rear 2F focus of the second lens 106, which is symmetrical about the second lens 106 with the image of the input fiber 101 in the 3dB splitter. Two output optical paths are designed to be completely symmetrical with an input optical path, so that the phase distribution of the cross section of a signal entering the output optical path is equal to that of the input optical path, and the transmission form is kept unchanged.
Example two
Fig. 2 is a schematic structural diagram of another optical splitter according to a second embodiment of the present invention. The optical splitter includes at least: one optical input port and two optical output ports; the optical fiber access end face at the input port and the optical fiber access end face at the first output port are both ground to form an inclination angle of a preset numerical value, and the optical fiber access end at the input port is plated with a light splitting film to ensure that the optical fiber at the input port is in seamless butt joint with the optical fiber at the first output port.
Preferably, the input optical fiber 201 of the optical input port is polished to a slope of a predetermined numerical angle, for example, a predetermined numerical angle of 30 °, and is coated with a 3dB spectroscopic thin film; meanwhile, the output optical fiber 202 at the first output port is ground into an inclined plane with the same angle, so that the input optical fiber 201 and the output optical fiber 202 are in gapless physical butt joint; only a 3dB light splitting film is added in the whole optical path, no other elements and transmission media are changed, and only the size of light is changed, so that the phase distribution of signals is not influenced. The output fiber 203 at the second output port couples the reflected optical signal, and can perform power comparison operation processing even if the phase mode of the signal is partially changed but the optical power is not greatly influenced because physical contact cannot be realized, so that the optical splitter structure is low in cost.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a multimode laser test assembly according to a third embodiment of the present invention. The multimode laser test assembly at least comprises: the optical splitter, the mode winding device, the detector and the screening module in the first embodiment; wherein the mode winder is arranged at the first output port or the second output port; the first output port and the second output port are respectively provided with a first detector and a second detector, and the screening module screens the distribution of the optical fiber injection modes of the multimode optical module light source by comparing the optical power difference received by the first detector and the second detector.
Preferably, the multimode laser testing component utilizes the optical splitter described in the first embodiment, and adds a mode winder 301 with a fixed diameter and a fixed number of turns on one output branch of the optical splitter, and winds and fixes the output optical fiber at the output port. The mode winder 301 mainly functions to attenuate the high-order mode with the transmitted mode energy deviated from the center and far from the edge of the core. If the laser is cheap in optical axis or object distance adaptation in the assembling process, the mode energy distribution of the injected optical fiber of the laser cannot meet the standard requirement, and the high-order mode which is easy to attenuate accounts for a larger proportion. After passing through the mode winder 301, the optical power changes greatly, and mode screening can be performed by comparing the received power values corresponding to the detectors 302 and 303 at the two output ports. If the variation amplitude exceeds the set delta P (such as 1dB), the mode distribution exceeds the acceptable range, and thus the mode distribution of the multimode optical module light source injection optical fiber is screened.
Example four
Fig. 4 is a schematic structural diagram of another multimode laser test assembly according to the fourth embodiment of the present invention. The multimode laser test assembly at least comprises: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet; the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuating glass sheet is arranged between the input port and the lens, and the non-attenuating glass sheet is arranged between the output port and the lens, so that the optical path of the output port is completely symmetrical to the optical path of the input port, and the transmission phases of signal light in input and output optical fibers are consistent.
Preferably, the multimode laser test component mainly realizes the function of an attenuator, and the key core point of the multimode laser test component is that an input optical fiber at an input port and an output optical fiber at an output port are bilaterally symmetrical and are placed at front and rear 2F focuses of a lens; preferably, a continuously variable attenuation slide 401 is placed between the input optical fiber and the lens, an attenuation-free slide 402 with the same specification as the attenuation slide 401 is placed between the lens and the output optical fiber, optical path matching is carried out, and transmission is carried out through completely bilaterally symmetrical optical paths, so that the transmission phases of signal light in the input optical fiber and the output optical fiber are consistent.
Preferably, in another aspect, this embodiment further provides a multimode laser testing assembly, where the multimode laser testing assembly at least includes: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet; the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuation glass sheet is arranged between the input port and the lens, a partition progressive reflecting film is plated on the attenuation glass sheet, and the attenuation-free glass sheet is arranged between the output port and the lens and used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multi-mode laser.
Preferably, the difference from the above multi-mode laser testing component for implementing the attenuator function is that the attenuating slide 401 is plated with a continuously changing reflective film, that is, a return loss continuously adjustable function is implemented, which can meet the test of the acceptable return light size of the laser in the module index and give a quantitative value.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a multimode optical transceiver module testing system according to a fifth embodiment of the present invention. The multimode optical transceiver module test system comprises: an optical splitter 501 as described in the first embodiment, a screening module 502 of a multi-mode laser module as described in the third embodiment, an attenuator 503 of a multi-mode laser module as described in the fourth embodiment, a return loss tunable module 504 of a multi-mode laser module as described in the fourth embodiment, and a display module 505;
the test system obtains light splitting without changing signal mode distribution through the optical splitter 501; the screening module 502 is configured to screen distribution of injected optical fiber modes of a light source of a multimode optical module; the attenuator 503 is configured to reduce the optical power to a target value on the premise that the transmission phase of the signal light in the input and output optical fibers is not changed; the return loss adjustable module 504 is used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multimode laser; the display module 505 is configured to display the output power of the screening module 502, and screen by comparing the difference between the two output powers.
In the test process, attenuation and light splitting elements which need to be added in the test can only divide the amplitude (light degree) of the optical signal and cannot change the phase of the signal, namely, the mode energy distribution of the transmission optical signal on the transverse section cannot be influenced, otherwise, the test result is not a true value. Therefore, the test system provided by the embodiment improves on the mode energy distribution of the transmission optical signal on the transverse cross section without changing the signal phase, and ensures the authenticity of the test result.
EXAMPLE six
Fig. 5 is a schematic structural diagram of a multimode optical transceiver module test system according to a sixth embodiment of the present invention. The multimode optical transceiver module test system comprises: an optical splitter 501 as described in the second embodiment, a screening module 502 for a multi-mode laser module as described in the third embodiment, an attenuator 503 for a multi-mode laser module as described in the fourth embodiment, a return loss tunable module 504 for a multi-mode laser module as described in the fourth embodiment, and a display module 505;
the test system obtains light splitting without changing signal mode distribution through the optical splitter 501; the screening module 502 is configured to screen distribution of injected optical fiber modes of a light source of a multimode optical module; the attenuator 503 is configured to ensure that transmission phases of signal light in the input optical fiber and the output optical fiber are consistent; the return loss adjustable module 504 is used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multimode laser; the display module 505 is configured to display the output power of the screening module 502, and screen by comparing the difference between the two output powers.
The optical splitter and the multimode laser device in the fifth embodiment and the sixth embodiment are specifically described in the above embodiments, and therefore, the description thereof is omitted here.
Many of the functional units described in this specification have been labeled as modules, in order to more particularly emphasize their implementation independence.
In the embodiments of the methods of the present invention, the sequence numbers of the steps are not used to limit the sequence of the steps, and for those skilled in the art, the sequence of the steps is not changed without creative efforts.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A multimode laser test assembly, comprising at least: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet;
the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuating glass sheet is arranged between the input port and the lens, and the non-attenuating glass sheet is arranged between the output port and the lens, so that the optical path of the output port is completely symmetrical to the optical path of the input port, and the transmission phases of signal light in input and output optical fibers are consistent.
2. A multimode laser test assembly, comprising at least: the device comprises an optical input port, an optical output port, a lens, a partition progressive attenuation glass sheet and an attenuation-free glass sheet with the same size as the attenuation glass sheet;
the lens is arranged between the optical input port and the optical output port, and the distances between the lens and the optical input port and the optical output port are double focal lengths; the attenuation glass sheet is arranged between the input port and the lens, a partition progressive reflecting film is plated on the attenuation glass sheet, and the attenuation-free glass sheet is arranged between the output port and the lens and used for calculating the proportion and the power of reflected light and testing the anti-reflection performance of the multi-mode laser.
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| CN201810842353.4A CN109143595B (en) | 2016-01-07 | 2016-01-07 | Splitter, multimode laser testing component and optical module testing system |
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| CN109283689B (en) | 2021-06-01 |
| CN105759430A (en) | 2016-07-13 |
| CN109143595A (en) | 2019-01-04 |
| CN109283689A (en) | 2019-01-29 |
| CN105759430B (en) | 2019-02-19 |
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