An Optical Add-Drop Multiplexer with a Grating-Loaded Directional Coupler in Silica Waveguides

Takashi SAITO
Tsuyoshi SHIMODA
Tadahiko HANADA
Yutaka URINO
Mitsuhiro KITAMURA

IEICE TRANSACTIONS on Electronics   Vol.E82-C    No.8    pp.1514-1517
Publication Date: 1999/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: Optical Passive Devices and Modules
Bragg grating,  silica waveguide,  optical add/drop multiplexer (OADM),  wavelength division multiplexing (WDM),  

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An optical add-drop multiplexer with a grating-loaded directional coupler in silica waveguides is demonstrated. The device for this configuration has a large fabrication tolerance and is small in size. A new scheme, in which the coupling length of the directional coupler is twice the complete coupling length, enables low cross-talk for both add and drop operations. This device is polarization-independent due to its relatively low-temperature process.