Compact Hybrid Integrated 100 Gb/s TOSA Using EADFB Laser Array and AWG Multiplexer
We have developed a compact hybrid integrated four lane x25.8 Gb/s transmitter optical sub assembly (TOSA) for a 100 Gb/s transceiver for 40 km transmission. The TOSA has a simple configuration in which a four channel electroabsorption modulator integrated distributed feedback (EADFB) laser array is directly attached to the input waveguide end faces of a silica based arrayed waveguide grating (AWG) multiplexer. We integrated a lateral tapered spot size converter for the EADFB laser to achieve a high optical butt coupling efficiency between the EADFB lasers array and the AWG multiplexer. We confirmed that the TOSA, which is 19.9 mm x 6 mm x 5.8 mm, achieved error free operation for a 40 km transmission with a high average optical output power of over 0.3 dBm at an operating temperature of 55 degC.
IEEE Photonics Technology Letters