Filling the frequency gaps of a planar optical spectrum analyzer using a 2.5-GHz-spaced arrayed-waveguide grating in the C and L bands

Author

Takada, Kazumasa ; Satoh, Shin-Ichi

Author_Institution

Dept. of Electron. Eng., Gunma Univ., Kiryu, Japan

Volume

24

Issue

7

fYear

2006

fDate

7/1/2006 12:00:00 AM

Firstpage

2495

Lastpage

2499

Abstract

A vernier configuration in a 2.5-GHz-spaced 128-channel arrayed-waveguide grating (AWG) for use as a secondary demultiplexer in a planar optical spectrum analyzer was incorporated with a tandem configuration. The frequency changes were 3.0 and 2.5 GHz for adjacent input and output ports, respectively. By selecting any of the eight input ports of the AWG, new passbands could be generated in the gaps between adjacent passbands and in the gaps produced when the diffraction order of the AWG was changed. Enough new passbands were generated to achieve frequency sampling at 1-GHz intervals without dead frequency points in the C and L bands of optical fiber amplifiers.

Keywords

arrayed waveguide gratings; demultiplexing equipment; integrated optics; light diffraction; optical communication equipment; optical fibre amplifiers; optical fibre communication; spectral analysers; wavelength division multiplexing; 1 to 2 GHz; 2.5 GHz; 320 GHz; 4 to 8 GHz; C band; L band; arrayed-waveguide grating; dense-wavelength-division multiplexing; diffraction order; frequency gap filling; frequency sampling; optical fiber amplifiers; passband generation; planar optical spectrum analyzer; secondary demultiplexer; vernier configuration; Arrayed waveguide gratings; Filling; Frequency; Optical arrays; Optical crosstalk; Optical diffraction; Optical waveguides; Passband; Slabs; Spectral analysis; Dense-wavelength-division-multiplexing (DWDM); grating; optical planar waveguides; optical spectrum; phase array;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2006.874659

Filename

1650527