Filterless Broadband Tunable Optoelectronic Oscillator with Double Long Loop Structure

Abstract

The invention relates to a dual-long-loop structured filter-free wideband-tunable photoelectric oscillator. By the dual-long-loop structured filter-free wideband-tunable photoelectric oscillator, the problem that an existing optical / electrical filter cannot be adopted to achieve large-range frequency tuning of the photoelectric oscillator while signal single-mode output is ensured is mainly solved. A laser (1) is connected with a strength modulator (3) through a polarization controller (2), the strength modulator (3) is connected with an optical coupler (5) through a long optical fiber (4), the optical coupler (5) is connected with a photoelectric detector (6) through an optical fiber and respectively two adjustable delay lines (7), the two photoelectric detectors (6) are combined to a path by an electric synthesizer to be connected with an input end of a power amplifier, and an output end of the power amplifier and the strength modulator are separately connected with a power divider. The dual-long-loop structured filter-free wideband-tunable photoelectric oscillator has the potential of rapid frequency tuning, and the tuning method is simple.

Description

technical field [0001] The invention relates to the fields of communication, radar, electronic countermeasures, etc., and in particular relates to a filter-less broadband tunable photoelectric oscillator with a double long ring structure. Background technique [0002] At present, a major problem in optoelectronic oscillators is that while using a long optical fiber feedback loop of the order of one kilometer to reduce the output signal noise, a series of oscillation modes with frequency intervals below 200kHz are produced, which cannot be adopted by the existing The optical / electrical filter filters out other oscillation modes to realize the single-mode signal output of the optoelectronic oscillator. Even in the dual-loop structure using long and short optical fibers, the mode interval is still below 20MHz, and it is impossible to use existing optical and electrical filters to achieve wide-range frequency tuning of the optoelectronic oscillator while ensuring single-mode sig...

AI Technical Summary

Problems solved by technology

[0002] At present, a major problem in optoelectronic oscillators is that while using a long optical fiber feedback loop of the order of one kilometer to reduce the output signal noise, a series of oscillation modes with frequency intervals below 200kHz are produced, which cannot be adopted by the existing The optical / electrical filter filters out other oscillation modes to realize the single-mode signal output of the optoelectronic oscillator

Images