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Power Supply Noise Rejection and Fiber Optic Transceivers

There are no industry standards that cover power supply noise rejection (PSNR) for fiber optic transceivers. This paper will describe one approach for testing the PSNR of fiber optic transceivers. While this PSNR test methodology and related test limits will refer to small form factor (SFF) transceivers, it can be adapted to any fiber optic transceiver platform. Since there are no established PSNR tests for fiber optic transceivers, discussions on power supply noise issues are typically followed by contentious debates. For this reason, there is a review of several areas directly related to the subject of power supply noise rejection. First there is a clarification of the components of noise and how circuits are benchmarked for noise performance. The next three areas for review are essential to support and justify the PSNR tests and test limits. The areas are system power supplies, system level noise suppression, and sources of noise. An overview of typical fiber optic transceiver design as it relates to power supply noise is presented. Finally, a PSNR test methodology and test limits are presented.

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