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Photonic integrated transmitter for space optical communications
Author(s): Joseph Fridlander; Victoria Rosborough; Fengqiao Sang; Sergio Pinna; Steven Estrella; Leif Johansson; Jonathan Klamkin
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Paper Abstract

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.

Paper Details

Date Published: 20 March 2019
PDF: 7 pages
Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091026 (20 March 2019); doi: 10.1117/12.2526684
Show Author Affiliations
Joseph Fridlander, Univ. of California, Santa Barbara (United States)
Victoria Rosborough, Univ. of California, Santa Barbara (United States)
Fengqiao Sang, Univ. of California, Santa Barabra (United States)
Sergio Pinna, Univ. of California, Santa Barbara (United States)
Steven Estrella, Univ. of California, Santa Barbara (United States)
Freedom Photonics, LLC (United States)
Leif Johansson, Freedom Photonics, LLC (United States)
Jonathan Klamkin, Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 10910:
Free-Space Laser Communications XXXI
Hamid Hemmati; Don M. Boroson, Editor(s)

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