Optoelectronic oscillator based on germanium modulator

Abstract

The invention provides an optoelectronic oscillator based on a germanium modulator, and relates to the field of radio frequency components. The optoelectronic oscillator comprises an input spot-size converter, the germanium modulator and an output spot-size converter. The input spot-size converter, the germanium modulator and the output spot-size converter are integrated on the same chip which is arranged on an SOI wafer. The optoelectronic oscillator further comprises a light source. The light source is coupled to the germanium modulator through the input spot-size converter. The output spot-size converter is connected with the end B of an optical circulator. The end C of the optical circulator is connected with an optical fiber delay line, an erbium-doped fiber amplifier and the end A of an optical coupler in sequence. The end B of the optical coupler is connected with the end A of the optical circulator. The germanium modulator is connected with an electric band-pass filter which is connected with the end B of an electric circulator, the end C of the electric circulator is sequentially connected with an electric amplifier and the end A of an electric coupler, and the end B of the electric coupler is connected with the end A of the electric circulator. According to the optoelectronic oscillator based on the germanium modulator, active devices are highly integrated, the occupied space is small, the power consumption is low, and the cost of the optoelectronic oscillator is reduced.

Description

technical field [0001] The invention relates to the field of radio frequency devices, in particular to a photoelectric oscillator based on a germanium modulator. Background technique [0002] At present, the commonly used electronic microwave oscillation sources have low spectral purity, while high-purity radio frequency signal sources have important application value in radar, communication and other fields, while optoelectronic oscillators can generate oscillation signals with high spectral purity. The photoelectric oscillator is mainly composed of a light source, an optical modulator, an optical detector, an optical delay line, an optical coupler, a radio frequency bandpass filter, an electrical amplifier, and an electrical coupler. The light source sends the signal to the optical modulator, and the modulated optical signal is detected by the optical detector after being transmitted by the optical delay line. Produces a high-purity RF signal with the same passband as the...

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Problems solved by technology

[0003] However, since the optical modulator and optical detector are active devices, the cost of the device is relatively high; and the optical modulator and optical detector are discrete devices, which occupy a large volume and consume relatively high power consumption, so the cost of the entire photoelectric oscillator is relatively high. high

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