An indium phosphide (InP)-based photonic integrated circuit (PIC) transmitter for free space optical communications was demonstrated. The transmitter consists of a sampled grating distributed Bragg reflector (SGDBR) laser, a high-speed semiconductor optical amplifier (SOA), a Mach-Zehnder modulator, and a high-power output booster SOA. The SGDBR laser tunes from 1521 to 1565 nm with >45 dB side mode suppression ratio. The InP PIC was also incorporated into a free space optical link to demonstrate the potential for low cost, size, weight, and power. Error-free operation was achieved at 3 Gb/s for an equivalent link length of 180 m (up to 300 m with forward error correction).

中文翻译：

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用于自由空间光链路的磷化铟光子集成电路

展示了一种用于自由空间光通信的基于磷化铟（InP）的光子集成电路（PIC）发射器。该发射机由采样光栅分布式布拉格反射（SGDBR）激光器、高速半导体光放大器（SOA）、马赫-曾德调制器和高功率输出增强器SOA组成。SGDBR 激光器的调谐范围为 1521 至 1565 nm，边模抑制比 >45 dB。InP PIC 还被纳入自由空间光链路中，以展示低成本、尺寸、重量和功率的潜力。在 180 m 的等效链路长度（采用前向纠错时可达 300 m）下，实现了 3 Gb/s 的无差错操作。