Optical fiber filter with ultra-wide tuning range

Abstract

The invention discloses an optical fiber filter with an ultra-wide tuning range, which comprises an input optical fiber, a two-dimensional mechanical rotating mirror, a collimation and beam expanding system, two gratings and an output optical fiber, and is characterized in that the input optical fiber emits multi-wavelength optical signals to the two-dimensional mechanical rotating mirror, the optical signals are reflected to the collimation and beam expanding system to form parallel light beams, and the parallel light beams are transmitted to the two-dimensional mechanical rotating mirror; parallel light beams are incident on the grating, the grating generates dispersion to scatter different wavelengths to different angles, and light with a specific diffraction angle is input into the output optical fiber by adjusting the two-dimensional mechanical rotating mirror. The two-dimensional mechanical rotating mirror is used for switching the gratings of different wave bands, tuning of the optical wavelength in the ultra-wide enclosure can be achieved, the application scene is greatly expanded, the cost is reduced, the optical path is simple, and fast tuning can be achieved. In addition, the number of channels is expanded by multiplexing the time and the space of the rotating device.

Description

technical field [0001] The invention belongs to the field of optical fiber communication and optical fiber sensing, in particular to an optical fiber filter with an ultra-wide tuning range. Background technique [0002] In long-distance and high-capacity communication, DWDM optical fiber communication occupies a dominant position. With the explosive growth of network services, DWDM transmission channels are extending from traditional 80 or 96 channels to 120 channels, or even L band. Optical channel performance monitor is an essential and important device for system health in DWDM optical communication system. As the core optical engine of the optical channel performance monitor, the tunable optical fiber filter also requires a corresponding extension of the working wavelength range. The wavelength tuning range of mainstream tunable fiber filters on the market is 40~50nm. A single independent device cannot meet the ultra-wide C+L tuning range, so two independent devices ha...

AI Technical Summary

Problems solved by technology

The wavelength tuning range of mainstream tunable fiber filters on the market is 40~50nm. A single independent device cannot meet the ultra-wide C+L tuning range, so two independent devices have to be used to complete the tuning of C or L band or scanning

The disadvantage of this method is that it is expensive and bulky

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