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20 March 2019 Photonic integrated transmitter for space optical communications
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Proceedings Volume 10910, Free-Space Laser Communications XXXI; 1091026 (2019)
Event: SPIE LASE, 2019, San Francisco, California, United States
We present results of an indium phosphide (InP) monolithic photonic integrated circuit (PIC) transmitter suitable for space-optical communications up to 10 Gbps for NRZ-OOK and DPSK modulation and up to 5 Gbps RZ-DPSK modulation. The PIC includes an SG-DBR laser tunable across the entire telecommunications C-Band, a semi-conductor optical amplifier (SOA), a Mach-Zehnder modulator (MZM) for efficient encoding of phase information, and an electroabsorption modulator (EAM) which serves as an RZ pulse carver. The transmitter PIC is integrated in a testbed with a custom board that provides biasing and driving electronics. The commercial-off-the-shelf (COTS) differential driver generates an estimated 4.5-5 Vpp differential modulation voltage for the dual drive MZM. An identical driver was used for the EAM 50% RZ pulse carver but only a single output was used with the other output terminated with a 50Ω load. The SOA and laser gain sections were biased at 90 mA each. Clear eye openings were achieved for all modulation formats.
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Joseph Fridlander, Victoria Rosborough, Fengqiao Sang, Sergio Pinna, Steven Estrella, Leif Johansson, and Jonathan Klamkin "Photonic integrated transmitter for space optical communications", Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091026 (20 March 2019);

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