Two-port tunable TFF optical filter

Abstract

The invention discloses a two-port tunable thin film filter (TFF) optical filter. The filter comprises a tunable optical filter unit, a wavelength detection unit and a control unit, wherein the tunable optical filter unit partially feeds input signal light back to the wavelength detection unit; the wavelength detection unit is connected with the tunable optical filter unit, detects the power change condition of the received signal light and outputs the condition to the control unit; and the control unit is connected with the wavelength detection unit, determines the drift condition of the central wavelength of output light through the power change condition of the output light of the wavelength detection unit, and corrects a tuning controller connected with the control unit. The filter has a simple structure and a built-in wavelength feedback structure and can completely eliminate influence caused by unstable light source power; symmetrical optical paths are adopted, so that all wavelengths and incident angles can completely compensate polarization mode dispersion caused by an optical path difference; the tuning performance of a device is improved; and the filter has the function of optical signal monitoring modules such as the Optical Society of America (OSA), an optical wavelength manager (OWM) and the like.

Description

technical field [0001] The invention relates to a tunable TFF optical filter. In particular, it relates to a two-port tunable TFF optical filter that can be widely used in dense wavelength division multiplexing systems, or used in optical wavelength meters as wavelength scanning devices, or applied in the field of optical sensing. Background technique [0002] Tunable optical filter is a very critical device in optical communication network. With the increase of the number of Dense Wavelength Division Multiplexing (DWDM) channels, tunable filter has become a hot spot. At present, there are many technologies used to realize tunable optical filters, mainly multi-cavity TFF type, FP cavity type, acousto-optic tunable type and micro-ring resonator type. Among them, the acousto-optic tunable type uses the anomalous Bragg diffraction generated by the interaction between the surface acoustic wave (SAW) and the light wave, and can realize filtering together with the polarization co...

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Problems solved by technology

[0017] However, since the transmitted light beam will have a certain up-and-down position drift due to the different inclination angles of the filters, the receiving collimator must move up and down (such as Image 6 ), which adds great difficulty to the reception of the transmitted light signal, and requires very high machining accuracy for the corresponding mechanical parts

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