OSNR Monitoring Technique for DPSK/DQPSK Signals Based on Self-Heterodyne Detection

Author

Choi, H.Y. ; Takushima, Y. ; Chung, Y.C.

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon

Volume

20

Issue

13

fYear

2008

fDate

7/1/2008 12:00:00 AM

Firstpage

1124

Lastpage

1126

Abstract

We describe a new method for monitoring the ldquoin-bandrdquo optical signal-to-noise ratio (OSNR) of differential phase-shift-keying (DPSK) and differential quadrature phase-shift-keying (DQPSK) signals. This technique estimates the OSNR by analyzing the radio frequency spectrum obtained by the self-heterodyne detection. The results show that the performance of the proposed technique is not sensitive to the effects of chromatic dispersion and polarization-mode dispersion. In addition, this technique can be used for monitoring the polarization-scrambled signals. For a demonstration, we measure the OSNR of the polarization-scrambled 10-Gb/s DPSK and 20-Gb/s DQPSK signals in a 640-km-long transmission link.

Keywords

differential phase shift keying; heterodyne detection; optical communication; optical noise; optical variables measurement; quadrature phase shift keying; DPSK; DQPSK; OSNR; bit rate 10 Gbit/s; bit rate 20 Gbit/s; chromatic dispersion; differential phase shift keying; differential quadrature phase shift keying; distance 640 km; optical signal-to-noise ratio; polarization mode dispersion; polarization scrambled signals; radio frequency spectrum; self heterodyne detection; transmission link; Chromatic dispersion; Differential quadrature phase shift keying; Frequency estimation; Monitoring; Optical noise; Optical sensors; Phase shift keying; Polarization; Radio frequency; Signal to noise ratio; Differential phase-shift keying (DPSK); differential quadrature phase-shift keying (DQPSK); optical signal-to-noise ratio (OSNR); self-heterodyne detection;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2008.924649

Filename

4538115