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Low power InP-based monolithic DFB-laser IQ modulator with SiGe differential driver for 32-GBd QPSK modulation

: Lange, S.; Wolf, N.; Gruner, M.; Yan, L.; Kaiser, R.; Velthaus, K.-O.; Choi, J.H.; Schell, M.


Journal of Lightwave Technology 34 (2016), Nr.8, S.1678-1682
ISSN: 0733-8724
Fraunhofer HHI ()

An optical transmitter incorporating a monolithically integrated laser and a traveling wave electrode in-phase and quadrature modulator is presented. A co-designed SiGe differential driver was co-packaged for highest quality push-pull modulation. With only 0.1-dB coupling loss between the laser and the modulator, and a low modulator switching voltage the transmitter power consumption was 1.1 W, which fits the CFP4 (analog coherent optics) ACO module overall budget of 6 W. Without DSP for precompensation, FEC or equalization, 32 GBd QPSK with 3 V-pp driving voltage and an error vector magnitude of <10% are presented. Operation with an optical signal-to-noise ratio larger than 14 dB is achieved before breaking the hard decision forward error correction threshold (3.8 x 10(-3)).