QSFP28光模块应用的标准分析与测试技术研究

Research on the Standard Analysis and Testing Technology for Application of QSFP28 Optical Module

万兆以太网已经运用于企业网和城域网络,各大通信公司正将视线转移到100 G以太网。随着大数据以及云计算处理的发展,使得数据中心交换机升级成为了必要。100 G以太网技术的核心在于光模块,4×25 Gb/s QSFP28并行收发模块提供了高速互连传输的解决方案,拥有更大的传输容量、更高的端口密度以及更低的功耗和成本。从系统角度,结合100 G以太网物理层标准,深入理解QSFP28光模块在100 G以太网中的应用;从信号层面,通过对实物的调试以及测试结果分析,充分保证其在实际应用中的可靠性。重点分析了光模块的管理接口I^2C总线以及业务接口的参数指标,针对实际调试过程中所遇到的测试问题,提出了相应的接收端扰动测试方案。在存在一定抖动的情况下,信号的误码率依然符合规范要求。一系列的试验结果证实了该光模块各项指标满足规范要求。

The ten-gigabit Ethernet has been applied to enterprise networks and metropolitan networks while the major communication companies have shifted vision to the new Ethernet network over 100 G. With the development of big data and cloud computing,it becomes necessary to upgrade the data center switches. The core technology of 100 G is the optical module,as the solution of high speed interconnected transmission; the 4 × 25 Gb/s QSFP28 parallel optical transceiver module provides larger transmission capacity,higher port density,and lower power consumption and lower cost. From the system perspective,and combining the physical layer standards of 100 G Ethernet,the application of QSFP28 optic modules in 100 G Ethernet is in-depth understood; from the signal level,its reliability in practical applications is fully guaranteed through repeating debugging and analysis of test results. The management interface of the module I^2C bus and the business interface parameters have been analyzed emphatically. Aiming at the problems encountering in practical testing process,the appropriate perturbation test methods of receiving ports are proposed. In presence of certain jittering,the bit error rate of the signal can still be controlled within the specification. Results of a series of tests verify that various indexes of the optical module meet the specification requirements.