Generador de microondas con un láser de Brillouin de fibra óptica estabilizado de bajo costo para sistemas de radio sobre fibra

Abstract

We have proposed a new optoelectronic oscillator to generate a stable ultra-narrow microwave carrier signal with low phase noise based on stimulated Brillouin scattering. A cost-effective sub-kilohertz Brillouin fiber ring laser with stabilized self-injection locked pump DFB (Distributed Feedback Laser) laser is offered as a key technique for microwave carrier generation. The full-width of generated microwave signal at —3 dB level is approximately equal to 300 Hz with a peak maximum at ~ 10.946 GHz. The strongest parasitic harmonics shifted from carrier signal peak on ±50 kHz, ±450 kHz, and ±900 kHz are below the main peak on 45 — 50 dB. A phase noise below —90 dBc/Hz for a frequency offset above 10 kHz from the carrier after passing the 20 km length test fiber was achieved.