Long-period-grating in a trench assisted planar optical waveguide

被引：6

作者：

Ashok, Nandam ^{[1
]}

Rastogi, Vipul ^{[1
]}

Kumar, Ajeet ^{[2
]}

机构：

[1] Univ Roorkee, Dept Phys, Roorkee 247667, Uttar Pradesh, India

[2] Delhi Technol Univ, Dept Appl Phys, Delhi 110042, India

来源：

APPLIED OPTICS | 2013年 / 52卷 / 09期

关键词：

FIBER GRATINGS; WAVELENGTH; FILTER;

D O I：

10.1364/AO.52.001954

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present long-period-grating in a planar optical waveguide that contains a low-index trench in the cladding region. The effect of the trench on transmission spectrum of the grating has been studied. The waveguide structure has been analyzed by the transfer matrix method and the output spectrum of the grating has been calculated by the coupled mode theory. Our numerical results show that position, strength, and width of the trench significantly affect the transmission spectrum of the grating. In particular, we show the appearance of triple resonance between a set of coupled modes and obtain an ultrawide band rejection in the output spectrum. We numerically demonstrate applications of the proposed structure in wideband rejection filters, refractive index sensors, and gain equalization of erbium-doped waveguide amplifiers. (C) 2013 Optical Society of America

引用

页码：1954 / 1962

页数：9

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