Abstract
An Indium-phosphide-based monolithically integrated photonic chip comprising of an amplified feedback laser (AFL) and a photodetector was designed and fabricated for on-chip photonic and microwave generation. Various waveforms including single tone, multi-tone, and chaotic signal generation were demonstrated by simply adjusting the injection currents applied to the controlling electrodes. The evolution dynamics of the photonic chip was characterized. Photonic microwave with frequency separation tunable from 26.3 GHz to 34 GHz, chaotic signal with standard bandwidth of 12 GHz were obtained. An optoelectronic oscillator (OEO) based on the integrated photonic chip was demonstrated without using any external electrical filter and photodetector. Tunable microwave outputs ranging from 25.5 to 26.4 GHz with single sideband (SSB) phase noise less than −90 dBc/Hz at a 10-kHz offset from the carrier frequency were realized.
Highlights
Photonic microwave technologies have important applications in the field of radio over fiber system, radar, lidar, unmanned driving, etc
With the development of photonic integration technology, photonic integrated chips are showing their potential in photonic microwave generation and processing [1,2], with the possibility to greatly reduce the system complexity, footprint, performance, and the cost
We present a simple Indium-phosphide(InP)-based monolithically integrated photonic microwave generator comprising of an amplified feedback laser (AFL) and a photodetector for on-chip photonic and microwave generation
Summary
Photonic microwave technologies have important applications in the field of radio over fiber system, radar, lidar, unmanned driving, etc. The development of photonic microwave technologies has received much attention. With the development of photonic integration technology, photonic integrated chips are showing their potential in photonic microwave generation and processing [1,2], with the possibility to greatly reduce the system complexity, footprint, performance, and the cost. Among various types of photonic integrated microwave generators, dual-mode semiconductor lasers are typical ones. Due to the lack of the necessary phase correlation between the laser modes, the heterodyning signal usually has a linewidth on the order of several or tens of MHz, which limits their potential applications in many fields.
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