Wavelength Tunable Optical Filters

Abstract

An optical filter with tunable wavelengths comprises a polarization controller, three optical fiber couplers, two optical fiber rings, a heating plate and a DC voltage source. A light output terminal of the polarization controller is connected to a light input terminal of the first optical fiber coupler. A first light input-output terminal of the first optical fiber coupler and a first light input-output terminal of the second optical fiber coupler are connected through the first optical fiber ring. A second light input-output terminal of the first optical fiber coupler and a second light input-output terminal of the second optical fiber coupler are connected through the first optical fiber ring. A third light input-output terminal of the second optical fiber coupler and a first light input-output terminal of the third optical fiber coupler are connected through the second optical fiber ring. A fourth light input-output terminal of the second optical fiber coupler and a second light input-output terminal of the third optical fiber coupler are connected through the second optical fiber ring. A light output terminal of the third optical fiber coupler is a light signal output terminal. The heating plate adheres onto the second optical fiber ring and is in electric signal connection with the DC voltage source. According to the invention, the tuning mode is simple, and the tuning range is raised by tens of times.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to an optical filter with tunable wavelength. Background technique [0002] The optical filter is an instrument used to select the wavelength of the optical signal. It can select the required wavelength from many wavelengths of the optical signal, while the light of other wavelengths cannot pass through the optical filter. The optical filter can be used for wavelength selection, Noise filtering, gain equalization, optical multiplexing and optical demultiplexing of optical amplifiers. In practical applications, different working environments require different wavelengths of light, so optical filters with tunable working wavelengths can meet the needs of many occasions, but the current tunable optical filters have a small tuning range and complicated tuning methods. In the case of large-scale and frequent light wavelength changes, existing optical filters are difficult to meet their ne...

AI Technical Summary

Problems solved by technology

[0003] Based on the above deficiencies, the present invention provides a wavelength tunable optical filter, which solves the problems that the existing tunable optical filter has a small tuning range and complicated tuning methods, and it is difficult to satisfy a wide range and frequently change the optical wavelength.

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