Performance characteristics of a WDM channel monitor based on an all-fiber AOTF with an on-fiber photodetector

Author

Li, Qun ; Au, Amy A. ; Lin, Chien-hung ; Tomov, I.V. ; Lee, H.P.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Irvine, CA, USA

Volume

15

Issue

5

fYear

2003

fDate

5/1/2003 12:00:00 AM

Firstpage

718

Lastpage

720

Abstract

We demonstrated an all-fiber wavelength-division-multiplexing channel monitor based on a narrow-band acoustooptic tunable filter (AOTF) with a built-in on-fiber photodetector. By employing a frequency-shift keying (FSK) modulation scheme, intrinsic wavelength accuracy of 0.02 nm is obtained for single-channel detection and 0.05 nm for multiple-channel detection. The minimum resolvable channel spacing is 1.0 nm. The measured channel power accuracy is <1 dB. The demonstrated channel monitor showed a polarization-dependent wavelength shift of /spl sim/0.15 nm, which is limited by the polarization mode splitting of the AOTF itself. The influence of FSK frequency spacing and the effect of channel crosstalk are also discussed.

Keywords

acousto-optical filters; channel spacing; frequency shift keying; optical communication equipment; optical crosstalk; optical fibre filters; optical fibre polarisation; photodetectors; wavelength division multiplexing; FSK frequency spacing; all-fiber WDM channel monitor; channel crosstalk; channel power accuracy; frequency-shift keying modulation scheme; intrinsic wavelength accuracy; minimum resolvable channel spacing; multiple-channel detection; narrow-band acoustooptic tunable filter; on-fiber photodetector; performance characteristics; polarization mode splitting; polarization-dependent wavelength shift; single-channel detection; wavelength-division-multiplexing channel monitor; Acoustic signal detection; Channel spacing; Filters; Frequency modulation; Frequency shift keying; Monitoring; Narrowband; Photodetectors; Polarization; Wavelength division multiplexing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2003.810248

Filename

1196147