CN216930021U

CN216930021U - Improved 400G PAM4 optical module test system

Info

Publication number: CN216930021U
Application number: CN202220068993.6U
Authority: CN
Inventors: 王波; 于佩
Original assignee: Allray Inc ltd
Current assignee: Allray Inc ltd
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-07-08
Anticipated expiration: 2032-01-12

Abstract

The utility model discloses an improved 400G PAM4 optical module test system, and relates to the technical field of optical module test systems. The utility model includes an optical module emission test system, comprising: the device comprises an error code instrument, a first test board, an optical switch and a DCA, wherein an optical module to be tested is arranged on the first test board, TX and RX interfaces are arranged on the first error code instrument and the first test board, the error code instrument is connected with the first test board, the optical module to be tested is connected with the optical switch, the optical switch is connected with the DCA, and the TX and RX of the first test board are electrically connected with the error code instrument by using a coaxial cable of an SMA interface at one end and a parallel high-speed connector at the other end. The utility model adjusts the wiring mode according to the content of the optical module test by fully utilizing the advantage of convenience in connection between one end of the parallel high-speed connector of the coaxial cable and the error code meter. The convenience of wiring is guaranteed, and the receiving electric eye pattern of the optical module can be tested.

Description

Improved 400G PAM4 optical module test system

Technical Field

The utility model belongs to the technical field of optical module test systems, and particularly relates to an improved 400G PAM4 optical module test system.

Background

With the advent of the big data and cloud computing era, people have higher and higher requirements on data transmission rate, and more data can be transmitted under the same signal bandwidth by using a high-order PAM4 modulation technology. The 400G PAM4 optical module comprises 8 paths of transmission and 8 paths of reception, has a single path rate of 53.125Gbps, can simultaneously work in the 8 paths of transmission and reception, has a highest transmission rate of 425Gbps, and is a mainstream optical module product based on the PAM4 technology in the industry. The conventional 400G PAM4 optical module test system comprises a transmitting end test board and a receiving end test board. The specification of the coaxial cable used for the electrical connection between the error code detector and the two test boards is generally that one end of the coaxial cable is an SMA interface and the other end of the coaxial cable is a parallel high-speed connector or both ends of the coaxial cable are parallel high-speed connectors. When the coaxial cable with the SMA interface at one end and the parallel high-speed connector at the other end is used for electrically connecting the error code tester and the test board, the test board for the transmitting end and the test board for the receiving end respectively need 16 SMA heads through knobs, and the operation is complicated. When the test optical module emits high-temperature and low-temperature performance, a thermocouple for testing the shell temperature of the optical module needs to be placed on the emission plate, and the heat flow instrument covers the emission end test plate; when the optical module is tested to receive high and low temperature performance, a thermocouple for testing the shell temperature of the optical module is required to be placed on the receiving end test board, and the heat flow instrument is covered on the receiving end test board. When the coaxial cable with the parallel high-speed connectors at the two ends is used, the work of connecting the SMA head is omitted, but the receiving electric eye diagram cannot be tested, and the defect that the thermocouple and the heat flow instrument need to be placed back and forth between a transmitting end test board and a receiving end test board during transmitting and receiving test also exists. When the two coaxial cables are used for testing, the thermocouple and the heat flow instrument cover are required to be placed back and forth according to the transmission or the reception of the test content, a tool clamp cannot be designed to fix the thermocouple and the heat flow instrument cover, and the test reliability and the test convenience are affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an improved 400G PAM4 optical module test system, which solves the technical problem that a heat flow meter needs to be covered on different test boards during the existing test of emission and reception.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

an improved 400G PAM4 optical module testing system, comprising an optical module emission testing system, comprising: the device comprises an error code instrument, a first test board, an optical switch and a DCA (digital-to-analog converter), wherein an optical module to be tested is arranged on the first test board, TX and RX interfaces are arranged on the first error code instrument and the first test board, the error code instrument is connected with the first test board, the optical module to be tested is connected with the optical switch, the optical switch is connected with the DCA, and the TX and RX of the first test board are electrically connected with the error code instrument by using a coaxial cable of an SMA interface at one end and a parallel high-speed connector at the other end.

Optionally, a TX port of the error code instrument is connected to a second test board, the second test board is provided with a standard optical module, one end of the standard optical module is connected to an optical attenuator, the error code instrument is connected to the second test board, the second test board is connected to the optical attenuator, the optical attenuator is connected to the first test board, and the optical module to be tested is connected to the error code instrument.

Optionally, the optical module to be tested is fixedly provided with a heat flow meter and a thermocouple, and the optical switch and the DCA, the second test board and the optical attenuator are all connected by optical fibers.

Optionally, the error detector is a 400G PAM4 error detector, the optical switch is an 8-channel optical switch, and the optical attenuator is an 8-channel optical attenuator.

The embodiment of the utility model has the following beneficial effects:

1. according to the embodiment of the utility model, the connection mode is adjusted according to the content of the optical module test by fully utilizing the advantage of convenience in connection between one end of the parallel high-speed connector of the coaxial cable and the error code meter. When the emission performance of the optical module is tested, connecting a parallel high-speed connector corresponding to TX of the test board I with a TX end of the error code meter; when the receiving performance of the optical module is tested, the parallel bullseye connector corresponding to the first test board RX is connected with the error code instrument RX end, the parallel high-speed connector corresponding to the TX end is disconnected with the error code instrument, the coaxial cable with the parallel high-speed connectors at both ends is used for the second test board, and the TX end of the test board is connected with the error code instrument TX end. The convenience of wiring is guaranteed, and the receiving electric eye pattern of the optical module can be tested.

2. For the same optical module, test emission and reception are unified on the first test board, so that a tool for designing and fixing a heat flow meter and a thermocouple is convenient, and the stability of a test system is improved.

Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic structural diagram of an optical module emission test system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an optical module receiving test system according to an embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the utility model have been omitted.

Referring to fig. 1-2, in the present embodiment, an improved 400G PAM4 optical module testing system is provided, which includes: the test board I is provided with a to-be-tested optical module, the error code tester and the test board I are provided with TX and RX interfaces respectively and used for transmitting and receiving signals, the error code tester is connected with the test board I, the to-be-tested optical module is connected with the optical switch, the optical switch is connected with the DCA, the TX and the RX of the test board I are electrically connected with the error code tester by using a coaxial cable with an SMA interface at one end and a parallel high-speed connector at the other end, and the wiring mode is adjusted according to the content of optical module test by fully utilizing the advantage of convenience in connection of one end of the parallel high-speed connector of the coaxial cable and the error code tester.

The application of one aspect of the embodiment is as follows: when the emission performance of the optical module is tested, the parallel high-speed connector corresponding to the TX of the test board I is connected with the TX end of the error code instrument, the optical module to be tested is inserted, the heat flow instrument cover and the thermocouple are fixed, and the emission high-low temperature performance test of the optical module is completed by switching the 8-channel optical switch; when the receiving performance of the optical module is tested, the parallel high-speed connector corresponding to the RX end of the test board is connected with the RX end of the error code meter, and the parallel high-speed connector corresponding to the TX end is not connected with the error code meter. And the second test board uses a coaxial cable with two ends provided with parallel high-speed connectors to connect the TX end of the second test board with the TX end of the error code meter. During testing, the standard optical module is inserted into the second testing board, the optical module to be tested is inserted into the first testing board, the heat flow meter and the thermocouple protection cover are fixed, and the receiving high-temperature and low-temperature performance test of the optical module is completed by adjusting the 8-channel optical attenuator.

The connection mode is adjusted according to the content of the optical module test by fully utilizing the advantage of convenience in connection between one end of the parallel high-speed connector of the coaxial cable and the error code meter. When the emission performance of the optical module is tested, connecting a parallel high-speed connector corresponding to TX of the test board I with a TX end of the error code meter; when the receiving performance of the optical module is tested, the parallel bullseye connector corresponding to the first test board RX is connected with the error code instrument RX end, the parallel high-speed connector corresponding to the TX end is disconnected with the error code instrument, the coaxial cable with the parallel high-speed connectors at both ends is used for the second test board, and the TX end of the test board is connected with the error code instrument TX end. The convenience of wiring is guaranteed, and the receiving electric eye pattern of the optical module can be tested.

Referring to fig. 2, a TX port of the error code tester is connected to a second test board, the second test board is provided with a standard optical module, one end of the standard optical module is connected to a second optical attenuator for preventing optical saturation distortion, the error code tester is connected to the second test board, the second test board is connected to the optical attenuator, the optical attenuator is connected to the first test board, and the optical module to be tested is connected to the error code tester.

Referring to fig. 1-2, the error detector of the present embodiment is a 400G PAM4 error detector, and the optical switch is an 8-channel optical switch, which has high stability and can work continuously; the optical attenuator is an 8-channel optical attenuator, so that light does not generate saturation distortion; the optical module to be tested is fixedly provided with a heat flow meter and a thermocouple and is used for testing the high and low temperature performance of the optical module; the optical switch and the DCA, the test board II and the optical attenuator are all connected by optical fibers, so that the signal transmission is more stable and efficient.

The above embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Claims

1. An improved 400G PAM4 optical module testing system, comprising:

optical module transmission test system includes: the device comprises an error code instrument, a first test board, an optical switch and a DCA (digital-to-analog converter), wherein an optical module to be tested is arranged on the first test board, TX and RX interfaces are arranged on the first error code instrument and the first test board, the error code instrument is connected with the first test board, the optical module to be tested is connected with the optical switch, the optical switch is connected with the DCA, and the TX and RX of the first test board are electrically connected with the error code instrument by using a coaxial cable of an SMA interface at one end and a parallel high-speed connector at the other end.

2. The improved 400G PAM4 optical module testing system as claimed in claim 1, wherein the TX port of the error detector is connected to a second testing board, the second testing board is equipped with a standard optical module, and one end of the standard optical module is connected to an optical attenuator.

3. The improved 400G PAM4 optical module testing system of any one of claims 1-2, wherein the error detector is connected to a second test board, the second test board is connected to an optical attenuator, the optical attenuator is connected to the first test board, and the optical module to be tested is connected to the error detector.

4. The improved 400G PAM4 optical module testing system of claim 1, wherein the error detector is a 400G PAM4 error detector, the optical switch is an 8-channel optical switch, and the optical attenuator is an 8-channel optical attenuator.

5. The improved 400G PAM4 optical module testing system as claimed in claim 1, wherein the optical module under test is fixedly installed with a thermal flow meter and a thermocouple.

6. The improved 400G PAM4 optical module testing system of claim 1, wherein the optical switch and DCA, the second testing board and the optical attenuator are all fiber-optically connected.