# US 2021/0242937 A1 · Testing method for optical communication module, and test device

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- Number: US 2021/0242937 A1
- Document ID: US20210242937A1
- Status: Published application
- Kind: A1
- Application number: 17/170,949
- Filed: 2021-02-09
- Published: 2021-08-05
- Earliest claimed: 2019-01-21
- Assignees: Shanghai Liaoyun Information Technology Co., Ltd.
- Applicants: Shanghai Liaoyun Information Technology Co., Ltd.
- Inventors: Xiuxiu YE
- Web page: https://patentgrep.com/patent/US20210242937A1

## CPC

- H04B 10/0731: {Testing or characterisation of optical devices, e.g. amplifiers}
- H04B 10/07953: {Monitoring or measuring OSNR, BER or Q}
- H04B 10/07: Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04L 1/0042: {Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape (H04L1/0067 takes precedence)}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present disclosure provides a testing method for optical communication module, and a test device. The testing method includes: reading encoded information from the optical communication module to be tested; obtaining a pre-stored optimal test parameter corresponding to the optical communication module, and adjusting test parameter configuration of test device accordingly to the optimal test parameter; obtaining test mode configuration, and performing a test on the optical communication module to obtain first test result; and obtaining a determination result according to the first test result and expected result. This method improves test efficiency and proposes a test device which emulates the estimated common performance characteristics of the main stream networking devices where the optical communication module attaches to in real-life applications, therefore, a qualified module passing the proposed test method has much lower possibility of having the interoperability issue mentioned in the background of the present disclosure.

## Claims

### Claim 1

A testing method for optical communication module, performed on a test device, comprising:
reading encoded information from the optical communication module to be tested;
obtaining a pre-stored optimal test parameter corresponding to the optical communication module to be tested, and setting up the test parameter of the test device according to the obtained optimal test parameter; wherein the test parameter is set to match the optimal test parameter exactly for normal test or purposely deviates from the optimal test parameter when measuring the margin range of interoperability;
obtaining test mode configuration, and performing a test on the optical communication module to obtain first test result according to the test mode configuration and the test parameter configuration, wherein the first test result comprises a bit error rate and frame loss ratio; and
obtaining a determination result according to the first test result and expected result, wherein the expected result information comprises an expected bit error rate and an expected frame loss ratio.

### Claim 2 (depends on 1)

The testing method for optical communication module according to claim 1, further comprising:
programming the encoded information into the optical communication module if the encoded information of the optical communication module does not exist.

### Claim 3 (depends on 1)

The testing method for optical communication module according to claim 1, further comprising:
adjusting the test parameters, determining the optimal test parameter and storing the optimal test parameter into the test device's database if the optimal test parameter corresponding to the optical communication module to be tested does not exist, wherein the optimal test parameter includes a test interface protocol, a transmission voltage amplitude and a finite impulse response filters setting at a transmitter of a test interface, and an equalization parameter at a receiver of the test interface;
setting up, according to the optimal test parameter, test interfaces of test devices to emulate estimated common SerDes characteristics of major networking devices where the optical communication module is expected to attach to in real-life applications.

### Claim 4 (depends on 1)

The testing method for optical communication module according to claim 1, wherein the step of obtaining test mode configuration, and performing a test on the optical communication module to obtain first test result according to the test mode configuration and the test parameter configuration comprises:
obtaining test mode configuration, obtaining packet configuration, and performing a test on the optical communication module to obtain first test result information according to the packet configuration and the test parameter configuration, in the event that the test mode configuration is in an Ethernet traffic test mode.

### Claim 5 (depends on 4)

The testing method for optical communication module according to claim 4, wherein the step of performing a test on the optical communication module to obtain first test result according to the packet configuration and the test parameter configuration, in the event that the test mode configuration is in an Ethernet traffic test mode comprising:
obtaining forward error correction configuration and the packet configuration, and performing a test on the optical communication module to obtain the first test result information according to configurations of the forward error correction, the packet configuration and the test parameter configuration, if the test mode configuration is in the Ethernet traffic test mode.

### Claim 6 (depends on 1)

The testing method for optical communication module according to claim 1, wherein the step of obtaining test mode configuration, and performing a test on the optical communication module to obtain first test result according to the test mode configuration and the test parameter configuration comprises:
obtaining test mode configuration, and obtaining polynomial constant configuration of a pseudo-random binary sequence, and performing a test on the optical communication module to obtain the first test result information according to the polynomial constant configuration and the test parameter configuration, if the test mode configuration is in a pseudo-random binary sequence test mode.

### Claim 7 (depends on 1)

The testing method for optical communication module according to claim 1, wherein the first test result information further comprises a generated digital signal eye diagram, and the expected result information further comprises an expected eye pattern template.

### Claim 8 (depends on 1)

The testing method for optical communication module according to claim 1, further comprising:
storing the test information into a database after the step of obtaining a determination result according to the first test result and the expected result, wherein the test information at least includes the encoded information of the optical communication module, the first test result, and the determination result.

### Claim 9 (depends on 1)

A test device, comprising a memory, a processor, a computer program stored in the memory and executed on the processor, an ASIC or FPGA programmed for traffic generation and analysis, and a plurality of test interfaces attached with host sides of optical communication modules to be tested, wherein the processor is configured to execute the computer program and manage the ASIC or FPGA component so as to implement steps of the testing method according to claim 1.