OSNR monitoring technique for DPSK/DQPSK signals based on self-heterodyne detection

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We describe a new method for monitoring the "in-band" 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.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2008-07
Language
English
Article Type
Article
Keywords

POLARIZATION-NULLING METHOD; NOISE

Citation

IEEE PHOTONICS TECHNOLOGY LETTERS, v.20, pp.1124 - 1126

ISSN
1041-1135
DOI
10.1109/LPT.2008.924649
URI
http://hdl.handle.net/10203/86832
Appears in Collection
EE-Journal Papers(저널논문)
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