Research And Implementation Of A CSFP Optical Transceiver

With the rapid development of applications over the internet, the demand of bandwidth is increasing. With the improvement of the manufacturing process of integrated circuits, the package of IC is becoming smaller and the power consumption is becoming lower at the same time. At present, the requirement of optical transceivers with smaller package is also emerging. Motivated by this requirement, some optical transceiver vendors and telecom equipment manufactures found a CSFP Group. They proposed a new Compact SFP optical transceiver standard which is named CSFP MSA specification. It defines a new SFP compatible optical transceiver which accommodates two SFP function units in one SFP optical transceiver's package. This CSFP optical transceiver has broad market prospects.In this thesis, a CSFP optical transceiver is developed. The product features are defined and the requirements of parameters such as power consumption, transmission rate and distance are analyzed. According to the requirements, we investigated possible solutions and presented our hardware design and software design. Intensive tests are also conducted to verify the performance of the presented transceiver. To control the two channels embedded in the CSFP transceiver flexibly, a software interface is designed to power on or off each channel independently. When a single channel is switched on or off, the dissipation power changes a lot. The changing of the power consumption impacts the temperature monitoring of the other working laser greatly. In order to mitigate this negative influence, the heat source and thermal resistance model of the transceiver are investigated and the response of monitor temperature to the step changing of the dissipation power is analyzed and calculated. Then, a software processing algorithm is proposed and implemented to solve the problem of precise laser temperature monitoring.The laser temperature monitoring is tested so as to verify the applicability of the thermal resistance model and the effectiveness of the proposed software processing algorithm. Test results show that, the thermal resistance model fits the test data very well and the proposed software processing algorithm can be used to improve the laser temperature monitoring accuracy effectively. Though fixed point operations are adopted by the algorithm, the accumulated error is less than 6% which is good enough. The precise temperature compensation provided by the proposed algorithm that lays the foundation of the flexible single channel control of the CSFP optical transceiver.