Laser wavelength adjustment-based opto-electronic oscillator with tunable frequency and broadband

Abstract

The invention discloses a laser wavelength adjustment-based opto-electronic oscillator with a tunable frequency and a tunable broadband. The opto-electronic oscillator is characterized in that: a wavelength tunable laser, a polarization controller, a double-arm Mach-Zehnder modulator, a narrowband phase-shifted fiber grating and a high speed photoelectric detector are connected in order by fibers; and radio frequency input ports of the high speed photoelectric detector, a microwave high pass filter, a microwave amplifier, a microwave phase shifter, a microwave coupler, a microwave 3dB quadrature coupler and the double-arm Mach-Zehnder modulator are connected in order by microwave coaxial lines. Besides, a closed opto-electronic oscillation loop is formed by the double-arm Mach-Zehnder modulator, the narrowband phase-shifted fiber grating, the high speed photoelectric detector, the microwave high pass filter, the microwave amplifier, the microwave phase shifter, the microwave coupler, and the microwave 3dB quadrature coupler; and a high quality microwave signal with a tunable frequency and a tunable broadband is generated at another output port of the microwave coupler by adjustinga wavelength of the wavelength tunable laser. According to the invention, the opto-electronic oscillator has advantages of compact structure, fast frequency adjusting speed, and wide tunable frequency domain and the like.

Description

technical field [0001] The invention relates to a high-quality microwave signal generating device with adjustable frequency broadband, in particular to a frequency broadband adjustable photoelectric oscillator based on laser wavelength adjustment. Background technique [0002] Traditional high-quality microwave signal sources generally use acoustic energy storage elements (such as quartz crystals) or microwave energy storage elements (such as dielectric cavities) to form resonant cavities. However, these energy storage elements only have a few high-Q resonance points in the low frequency band, and high-frequency microwave signals need to be generated by frequency doubling, but frequency doubling will bring about a significant decline in signal phase noise performance. In 1996, X.Steve Yao and Lute Maleki proposed the optoelectronic oscillator for the first time. The optoelectronic oscillator uses a high-Q photoelectric resonant cavity to store microwave energy, which can gen...

AI Technical Summary

Problems solved by technology

Frequency tunability is an important characteristic of microwave signal sources, but because it is difficult to produce high-Q broadband tunable microwave filters, the frequency adjustment range of traditional optoelectronic oscillators is limited to tens of MHz

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