研究目的
Demonstrating a free space optical link with an integrated indium phosphide transmitter for high data rate and tunable wavelength applications in space communications.
研究成果
The integrated InP PIC transmitter enabled a tunable free space optical link with error-free operation at 3 Gbps over an equivalent 180 m link, extendable to 300 m with FEC, demonstrating potential for compact, high-performance space communication systems.
研究不足
The link was tested with a short physical distance (1.35 m) and simulated attenuation, not actual long-range free space conditions; performance may vary in real-world deployments with atmospheric effects.
1：Experimental Design and Method Selection:
The experiment involved designing and fabricating a monolithic InP photonic integrated circuit (PIC) transmitter with components like a tunable SGDBR laser, SOA, MZM, and output SOA. The free space link setup used NRZ OOK modulation and BER measurements to evaluate performance.
2：Sample Selection and Data Sources:
The transmitter was fabricated on an n-type InP substrate with InGaAsP multiple quantum well structure grown by MOCVD. Data included optical spectra, eye diagrams, and BER curves.
3：List of Experimental Equipment and Materials:
High frequency ceramic submount, lensed single mode fiber, optical collimators, in-fiber variable optical attenuator, bias-Tee, PRBS generator.
4：Experimental Procedures and Operational Workflow:
The PIC was mounted and wire-bonded; optical signals were modulated, transmitted through air using collimators, and received with attenuation simulation via VOA; BER was measured at different data rates.
5：Data Analysis Methods:
Analysis involved measuring extinction ratios, SMSR, Vπ for MZM, and plotting BER vs. attenuation to determine error-free operation limits.
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