Satoshi Yoshikawa

Small form factor pluggable optical transceiver module with extremely low power consumption for dense wavelength division multiplexing applications

An optical transceiver module for the dense wavelength-division-multiplexing (DWDM) applications is successfully realized with so-called small form factor pluggable (SFP) platform that is well known as the smallest platform for 2.5.Gbps optical transceiver. The power consumption of DWDM-SFP modules we developed is reduced drastically, and that is 1.0 W maximum at the operating case temperature (Tc) range of -5 to 70 degC (for typical DWDM-SFP samples). This remarkable low power consumption is achieved by next three techniques which are a compact coaxial transmitter optical sub assembly (TOSA) package with a micro thermoelectric cooler (micro-TEC), a transceiver IC chip with many functions integrated therein and an unique structure which the TOSA is isolated from other heat sources.

SDH/SONET Multi-rate SFP Module with Gain Selectable Transimpedance Amplifier and Extinction Ratio Control Circuit

We report a SDH/SONET multi-rate SFP module with a gain selectable transimpedance amplifier (TIA) and a dual-loop APC based on top and bottom level hold. With compliance to SDH (STM-1/4/16) and SONET (OC-3/12/48) specifications even without an additional cost requirement, multi-bit rate operation with higher received sensitivity, fully dual-loop APC operation up to 3 Gbit/s and dynamically rate selecting operation are firstly demonstrated.