Large dynamic reflection type variable optical attenuator

Abstract

The invention provides a large dynamic reflection type variable optical attenuator. The large dynamic reflection type variable optical attenuator mainly comprises tail fibers, collimators, a filter, a rectangular reflector, a pad, a stepping motor, a stepping motor screw, a controller and a cabinet casing, wherein the filter is arranged between the collimators and the rectangular reflector and is fixedly arranged on the pad, the stepping motor is connected with the controller to control motion of the filter to realize optical energy linearity attenuation, and the rectangular reflector is fixed at a bottom face of the cabinet casing. Through the scheme, by fixing the rectangular reflector, the filter is driven to realize linearity attenuation of an optical signal, the structure is stable, debugging is easy, an attenuation scope of the optical attenuator can be improved by one times while the number and length of the filter are not changed, and thereby attenuation in a large dynamic scope is realized.

Description

technical field [0001] The invention belongs to the technical field of optical attenuators, in particular to a large dynamic reflective adjustable optical attenuator. Background technique [0002] Variable Optical Attenuator (VOA) is the most basic optical passive device in optical fiber communication, which can realize a certain amount of attenuation of optical power. With the wide application of wavelength division multiplexing (Wavelength Division Multiplexing, WDM) optical fiber transmission system and erbium doped fiber amplifier (Erbium Doped Fiber Amplifier, EDFA) in optical communication, it is necessary to control the optical signal power on the optical signal transmission channel. Gain equalization to eliminate signal self-excitation and improve signal-to-noise ratio makes the VOA an indispensable instrument. [0003] Paper "Working Principle and Automatic Calibration of Programmable Optical Attenuator" (Journal of Hefei University of Technology, Vol. , p. 485, N...

AI Technical Summary

Problems solved by technology

In the optical attenuator based on this principle to achieve optical attenuation, there is insertion loss between the reflected light and the output fiber collimator. Due to the difference in the mode field diameter of different wavelength components, the reflected light of different wavelengths is incident on the output fiber collimator. There are also differences in the insertion loss of the optical device, so there is a wavelength-dependent loss, which affects the accuracy of optical attenuation

Wavelength-dependent loss is a problem that needs to be solved in the prior art, especially when the light attenuation is large, the phenomenon of wavelength-dependent loss is particularly prominent

In addition, in the utility model patent "adjustable optical attenuator" and the invention patent "adjustable optical attenuator that compensates WDL by adjusting the position of the optical waveguide", the inclination of the mirror must be strictly controlled, and it is difficult to control the optical attenuation with high precision volume, structural instability, susceptible to vibration

[0005] To sum up, the optical attenuation range of the existing technology is narrow, there are insertion loss and wavelength-dependent loss, which affect the accuracy of optical attenuation, the structure is unstable, and the debugging is cumbersome

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