We report on a monolithic indium phosphide photonic integrated transmitter capable of generating high-speed return-tozero differential phase shift keying (RZ-DPSK) data streams for space optical communications as high as 5 Gbps. The integrated transmitter includes a sampled grating distributed Bragg reflector laser continuously tunable over 30 nm in the C-band, a semiconductor optical amplifier for amplification, a Mach-Zehnder modulator for encoding phase-shift-keying data, and electro-absorption modulator for return-to-zero pulse carving. The transmitter is situated in a custom electronics test bed for biasing various PIC sections and driving the modulators. Furthermore, this transmitter can also be utilized for 10 Gbps DPSK or NRZ-OOK.

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Joseph Fridlander, Victoria Rosborough, Fengqiao Sang, Sergio Pinna, Steven Estrella, Leif Johansson, and Jonathan Klamkin, "High-speed RZ-DPSK photonic integrated transmitter for space optical communications," Proc. SPIE 11133, Laser Communication and Propagation through the Atmosphere and Oceans VIII, 1113309 (Presented at SPIE Optical Engineering + Applications: August 13, 2019; Published: 6 September 2019); https://doi.org/10.1117/12.2528213.