Packaging Technology And Testing Of High-speed Optical Receiving Component

100Gbps Ethernet is rapidly developing and laying out all over the country to meet the large demand of data traffic.One of the most critical devices is the high-speed optical transceiver module,and the most important components in the optical transceiver module are the transmitter optical sub-assembly y(TOSA)and the receiver optical sub-assembly y(ROSA).At the same time,people’s requirements for transmission distance and connection loss are constantly improving,so higher power TOSA or higher sensitivity ROSA are needed.However,due to a series of uncontrollable nonlinear effects caused by too high input optical power,the most important component used in the optical transceiver module over 10 km long distance is ROSA with high sensitivity.According to the multi-source protocol requirements of 100 Gbps optical transceiver module for 40 km transmission in IEEE802.3ba,this paper reviews and summarizes the packaging history of optical transceiver module and the published design of 100 Gbps ROSA,and designs and manufactures a ROSA that can receive 40 km Ethernet signals at 4×25Gbps rate.On the basis of traditional ROSA,the ROSA integrates Semiconductor Optical Amplifier(SOA)chip,which compensates the received signal first,thus improving the minimum receiving power of ROSA,that is,the sensitivity.A comprehensive evaluation test was carried out on the manufactured samples,including DC test,electrooculogram test and bit error rate test.The test results show that the ROSA designed in this paper meets the requirements of100GBASE-ER4.In this paper,various problems that will occur when SOA is packaged in ROSA are analyzed,and the input optical path of SOA is designed to solve these problems,in which optical isolator and adjustable attenuator are integrated.Avoid the spontaneous noise light of SOA from entering the optical communication system before ROSA through optical isolators;An adjustable attenuator is made by Micro-Electro-Mechanical System(MEMS)rotating mirror to control the input power of SOA,so as to prevent the subsequent components from being damaged by too high output power of SOA.In this paper,based on the current packaging technology of optical transceiver devices and the analysis results of the designed optical path by ZEMAX software,a set of packaging process and points for attention for ROSA prototype are proposed,which can realize the small batch production of the prototype.Aiming at the problem that the lens alignment tolerance is very small,an optical coupling platform is built by ourselves,which can achieve the linear accuracy of up to 0.5μm and the angle accuracy of 33’’,and has a real-time monitoring system.