A tunable broadband ase light source

Abstract

The invention provides an tunable harmonic bandwidth ASE light source, which comprises a pump laser, a bandwidth reflector, a first wavelength division multiplexer, a ytterbium doped fiber, a second wavelength division multiplexer, an optical fiber end cap, a bandwidth flattening device, an optical isolator and a temperature controller, wherein a signal end of the first wavelength division multiplexer is connected to an input end of the bandwidth reflector; a share end of the first wavelength division multiplexer is connected to one end of the ytterbium doped fiber and the other end of the ytterbium doped fiber is connected a share end of the second wavelength division multiplexer; s signal end of the second wavelength division multiplexer is connected to an input end of the bandwidth flattening device; an input end of the bandwidth flattening device is connected an input end of the optical isolator; and an output end of the optical isolator is used as an output end port of the ASE light source. By adopting the tunable bandwidth ASE light source, the bandwidth ASE light output with stable output power, flat spectrum and tunable bandwidth is realized; and the tunable bandwidth ASE light output with 3 dB spectrum width larger than 45 nm, output power larger than 100 mW and good spectrum flatness is acquired.

Description

technical field [0001] The invention relates to the technical field of ASE optical fiber light sources, in particular to a tunable broadband ASE (Amplified Spontaneous Emission) light source. Background technique [0002] ASE fiber optic light source mainly includes a section of rare earth ion doped optical fiber (active optical fiber), generally doped with rare earth trivalent ions in its core, such as: erbium ion (Er 3+ ), Ytterbium ion (Yb 3+ ), neodymium ions (Nd 3+ )Wait. Under the pumping laser, it is made by using the working principle of rare earth ion doped fiber to amplify spontaneous emission. For some applications such as optical fiber sensing systems and optical device analysis and measurement, it is required that the ASE light source not only has a wide bandwidth (wide operating band range), but also can be moderately tuned. Although the operating bandwidth of ultrabroadband light-emitting diodes (LEDs) and superluminescent light-emitting diodes (SLDs) curr...

AI Technical Summary

Problems solved by technology

Generally, the gain of rare earth-doped fiber is relatively high. Using a single-stage structure and simply increasing the pump light power to pursue high-power ASE light output will easily lead to self-oscillation and cannot produce ASE light.

Furthermore, poor connection points in the optical path and optical fiber end faces will also produce light reflection or optical feedback, and it is also easy to form self-excited oscillation

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