A Tunable Photoelectric Oscillator

Abstract

The invention provides a tunable photoelectric oscillator. The tunable photoelectric oscillator is characterized in that a laser device (1), a polarization modulator (4), an Er-doped optical fiber amplifier (5), a first polarization controller (7), a first polarizer (8), an isolator (9), an optical fiber link (10) and a second opening of a circulator (11) are sequentially connected, a third opening of the circulator (11), a first photoelectric detector (12), a broadband microwave amplifier (13), a power divider (2) and the polarization modulator (4) are sequentially connected, the laser device (1), a dual-parallel modulator (15), a third polarization controller (14) and a first opening of the circulator (11) are sequentially connected, the dual-parallel modulator (15) is connected with a microwave source (3), and the output end of the Er-doped optical fiber amplifier (5) is connected with a frequency doubling optical signal output branch (6). Microwave signals generated by the tunable photoelectric oscillator can achieve the high adjustment accuracy and the wide adjustment range.

Description

technical field [0001] The invention relates to the technical field of photoelectric oscillators, in particular to a tunable photoelectric oscillator. Background technique [0002] Optoelectronic oscillators have great potential application value in the fields of light sensing, radar, wireless communication and so on. In the prior art, the structure of the Brillouin optoelectronic oscillator is as follows figure 1 As shown, the continuous light emitted from laser 1 passes through an electro-optical modulator and enters a fiber link as signal light. Laser 2 passes through a circulator and is injected back into the fiber link as Brillouin pump light. The wavelengths of laser 1 and laser 2 can be different, as long as the phases are locked. At the beginning, due to the noise in the loop, after passing through the electro-optical modulator, there will be many sidebands due to noise on the left and right of the signal light, but when passing through the optical fiber link, due ...

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Problems solved by technology

[0003] It can be seen from the above description that if the oscillation frequency is changed by changing the frequency difference between the pump light and the signal light, for the tunable lasers currently in practical use, the minimum adjustment step size is 1pm, which is equivalent to a frequency of 125MHz, although a high frequency can be obtained The adjustment range, but the adjustment accuracy is too low

If the signal light and the pump light are the same light source, the loop oscillation frequency can be changed by changing the Brillouin frequency shift. Although high adjustment accuracy can be achieved, the tunable range is too narrow. For a tunable light source in the C-band, The adjustment range of the oscillation frequency is only 360MHz. Therefore, it is difficult for the photoelectric oscillator in the prior art to simultaneously achieve high adjustment accuracy and a large tuning range

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