Complex long-period-grating-assisted-coupler and its application in optical signal buffer

doi:10.1007/s12200-011-0146-9

Front Optoelec Chin

2011, Vol. 4

Issue (3) : 315-319 https://doi.org/10.1007/s12200-011-0146-9

RESEARCH ARTICLE

Complex long-period-grating-assisted-coupler and its application in optical signal buffer

Xiaowei DONG(

), Weiwei JIANG, Xiaojuan SHENG

Laboratory of All Optical Network and Advanced Telecommunication Network, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China

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Abstract

By introducing gain/loss perturbation into periodic refractive index modulation, the unified coupled-mode equations and their close-form analytical solutions of complex long-period-grating-assisted-coupler (LPGAC) are deduced. Characteristics of power coupling are investigated and results show that unidirectional nonreciprocal signal transferring can be achieved by matching gain/loss with the refractive index modulation. Utilizing the feature of complex LPGAC, a novel optical signal buffer is proposed and its structure is examined in detail.

Keywords optical device long-period-grating-assisted-coupler optical signal buffer complex-modulated-grating

Corresponding Author(s): DONG Xiaowei,Email:way7803@163.com

Issue Date: 05 September 2011

Cite this article:

Xiaowei DONG,Weiwei JIANG,Xiaojuan SHENG. Complex long-period-grating-assisted-coupler and its application in optical signal buffer[J]. Front Optoelec Chin, 2011, 4(3): 315-319.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-011-0146-9
https://academic.hep.com.cn/foe/EN/Y2011/V4/I3/315

Fig.1 Complex long-period-grating-assisted-coupler

Fig.2 Influence of gain/loss perturbation on power coupling characteristic (solid line: , dotted line: ). (a) , ; (b) , ; (c) ; (d) ; (e) ; (f) ; (g) ; (h)

Fig.3 Schematic diagram of optical signal buffer based on complex LPGAC and self-closed loop

Fig.4 (a) Pulse signals in input port of waveguide 1; (b) pulse signals buffered in self-closed loop; (c) pulse signals picked up at output port of waveguide 1

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