Moriyasu Ichino

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.

A compact 2.5Gbps wavelength-tunable DWDM transmitter with direct-modulated DFB

A 2.5Gbps wavelength-tunable light source has been and will be for several years one of the most important component in a metropolitan core DWDM network. The worlds smallest wavelength-tunable transmitter module was successfully developed by using low cost direct-modulated DFB technology and newly designed integrated control circuits. All of the following functions are mass-produced in the 24-pin butterfly package (W18 /spl times/ D35 /spl times/ H8.5mm): a laser diode (LD) chip, a LD driver IC, an optical lens system, a thermo electric cooler (TEC) and a central processing unit (CPU) that controls LD temperature and its bias/modulation currents. The module can pick through its digital control interface and transmit one of four neighboring 100GHz ITU-T channels. The wavelength is tuned at 1GHz step even without a wavelength locker by precisely controlled temperature.