Radiation-proof erbium-doped photonic crystal fiber light source for high-precision fiber-optic gyroscope

Abstract

The invention provides an anti-radiation erbium-doped photonic crystal fiber light source for a high-precision fiber-optic gyroscope. The fiber light source is of a multi-pumping double-pass backward structure and adopts a self-prepared erbium-doped photonic crystal fiber as a gain medium. A system light path comprises a 980nm laser, a 665nm laser, a first wavelength division multiplexer, an erbium-doped photonic crystal fiber, a second wavelength division multiplexer, a first spectral filter, a second spectral filter and an optical fiber isolator. According to the optical fiber light source disclosed by the invention, effective light fading is realized by simultaneously pumping special wavelength laser, so that the stability of the average wavelength and the output power of the erbium-doped optical fiber light source in a space irradiation environment is ensured; meanwhile, a flat spectrum filter is adopted to filter and shape an output spectrum, so that the light source has a large bandwidth, the light source has a relatively low relative intensity noise characteristic, and the light source is particularly suitable for space application of a high-precision fiber-optic gyroscope.

Description

technical field [0001] The invention relates to a broadband optical fiber light source, in particular to an anti-radiation erbium-doped photonic crystal optical fiber light source for space high-precision optical fiber gyro. Background technique [0002] As a gain and transmission medium of active optical fiber devices, Erbium-doped optical fiber has been widely used in land and submarine long-line or highly distributed communication systems. With the continuous development of space technology, the application potential of active devices based on erbium-doped fiber in space has attracted more and more attention. But the special environment of space full of cosmic rays must be paid attention to. Studies have shown that when special technology is used, pump lasers, ordinary optical fiber devices and device pigtails already have good radiation resistance, while erbium-doped optical fibers are used as gain and transmission media for active optical fiber devices. Different, in ...

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Problems solved by technology

For the method of thermal fading, it needs to be heated to a very high temperature (300°C) to produce an obvious fading ef

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