Abstract
A compact multi-wavelength hybrid-integrated directly-modulated distributed-feedback laser (DML) transmitter optical sub-assembly (TOSA) has been achieved in our laboratory. The 8-channel distributed feedback (DFB) lasers are monolithically integrated based on the reconstruction-equivalent-chirp (REC) technology. With the high-density and high-speed packaging technique, the laser array and a multi-mode interference (MMI) multiplexer are assembled in the TOSA. The channel spacing of the TOSA is 200 GHz between adjacent lasers. It meets the 8 × 12.5 Gb/s operation demand and gives rather low channel crosstalk of less than −25 dB. This compact TOSA is of effective cost and shows good stability for mass production, which is expected to improve the performance of devices in access networks, data centers and supercomputing.
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