一种2×2长周期光纤光栅耦合器

2*2 long period fiber Bragg grating coupler

Abstract

本发明公开了一种2×2长周期光纤光栅耦合器,包括一施力装置以及两根紧密接触、并行排列的无保护层的裸光纤,即传输光纤和耦合光纤。施力装置在光纤的轴向传播方向周期性地施加周期(Λ)为百微米量级的径向压力,这样在两根裸光纤轴向传播方向上写入空间变化相同的光栅。当光纤光栅的空间周期使纤芯基模与高阶包层模满足相位匹配条件时,传输光纤和耦合光纤的纤芯基模与包层模相互耦合;除此之外,传输光纤与耦合光纤包层模之间通过消逝场作用相互耦合。基于这些耦合,周期径向压力在两根裸光纤上实现了耦合器的功能。由于长周期光纤光栅仅由外力作用产生,它是一种容易写入与擦除的波长选择方向耦合器,可应用于光通信网络作为一种灵活的分插复用器等器件。
The invention discloses a 2*2 long period fiber Bragg grating coupler which comprises a force applying device, and two pieces of closely contacted and parallel arranged bare optical fibers without protective layers, namely, transmission fiber and coupling fiber. The force applying device periodically applies radial pressure with period Lambada being hundred-micron magnitude on the axial propagation of the optical fibers, thus gratings with equivalent spatial variation are written on the axial propagation of the bare optical fibers. When spatial period of fiber Bragg grating causes fiber core fundamental modes and higher order cladding modes to satisfy the phase position matching condition, the fiber core fundamental modes and the cladding modes of the transmission fiber and the coupling fiber perform intercoupling; besides, cladding modes of the transmission fiber and the coupling fiber perform intercoupling under action of evanescent field. Based on the couplings, periodical radial pressure plays the role of a coupler on the two pieces of bare optical fibers. As the long period fiber Bragg grating is only generated by external force, the long period fiber Bragg grating coupler is a wavelength choice direction coupler easy to write and erase, and can be applied to optical communication network as a flexible add/drop multiplexer and the like.

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Cited By (4)

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    CN-103630975-AMarch 12, 2014北方工业大学Central wavelength and channel interval tunable optical-comb-shaped interferometer
    CN-103630975-BDecember 23, 2015北方工业大学中心波长和信道间隔可调的光梳状干涉仪
    CN-104022331-ASeptember 03, 2014蓝小玲Co-frequency combiner with F-type 3dB bridge
    CN-104022331-BMarch 16, 2016深圳市正弦波测试技术有限公司一种具有F型3dB电桥的同频合路器