An adjustable optical attenuation wavelength division multiplexer and attenuation adjustment method

Abstract

The invention discloses an adjustable optical attenuation type wavelength division multiplexer and an attenuation degree adjusting method. The adjustable optical attenuation type wavelength division multiplexer comprises a cylindrical support body provided with a plurality of grooves. A reflection support body is connected to the support body through a connecting rod. An optical attenuation disc is connected between the support body and the reflection support body through a connecting rod in a passing-through mode. Attenuation sheets with different attenuation degrees are placed in an embedded mode along a circumference. Incident collimators and output collimators are bonded in the grooves of the support body. A reflection optical filter is placed at a port portion of the output collimator. A total reflection prism is bonded on an end surface of the reflection support body. The invention also discloses an attenuation degree adjusting method of the adjustable optical attenuation type wavelength division multiplexer. Through rotatably adjusting of the optical attenuation discs, the attenuation sheets with the different attenuation degrees are made to be aligned with an output port to realize attenuation degree adjusting of the optical power of the output port.

Description

technical field [0001] The invention relates to the field of optical wavelength division multiplexers, in particular to an optical attenuation type wavelength division multiplexer and an attenuation adjustment method thereof. Background technique [0002] The optical signal transmission speed of modern optical fiber communication system is getting faster and faster, and the capacity of the system is also increasing, which depends on the application of erbium-doped fiber amplifier (EDFA) and dense wavelength division multiplexing (DWDM) technology. However, due to the inhomogeneity of the signal optical power emitted by the optical signal transmitter and the unevenness of the gain spectrum of the erbium-doped fiber amplifier, after several optical signals of different wavelengths in the dense wavelength division multiplexing system pass through the erbium-doped fiber The gain is inconsistent, and with the cascade use of multiple erbium-doped fiber amplifiers in the long-dista...

AI Technical Summary

Problems solved by technology

This imbalance is very harmful to the transmission performance of the entire optical fiber communication system, and often causes crosstalk between various signals, making the bit error rate of certain wavelength channels higher than the specified value

If the unbalanced power value is too high, it will cause nonlinear effects in the transmission of optical signals in the optical fiber, and cause the received optical power value of the receiver to exceed the maximum dynamic range of the receiver

If the unbalanced power value is too low, the optical power value received by the receiver will be lower than the sensitivity of the receiver, and the receiver will not receive the optical signal

[0004] Therefore, people use all-channel adjustable optical attenuators that dynamically adjust the signal optical power of each channel to adjust the optical power of multiple channel signals, especially compact coarse wavelength division multiplexers, because of their simple structure and size It is small and cheap, and is widely used in the optical communication industry at present. However, due to the obvious imbalance in the power of each channel, there is an urgent need for a method to balance the power of each channel of the compact coarse wavelength division multiplexer.

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