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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 32 — Nov. 10, 2010
  • pp: 6213–6216

In-band optical signal-to-noise ratio monitoring method based on high-resolution polarization analysis and induced differential group delay

Juan José Martínez, Asier Villafranca, Carlos D. Heras, Maria I. Roche, Jesús M. Subias, Javier Pelayo, Enrique Pellejer, Pilar Blasco, and Juan I. Garcés  »View Author Affiliations


Applied Optics, Vol. 49, Issue 32, pp. 6213-6216 (2010)
http://dx.doi.org/10.1364/AO.49.006213


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Abstract

We report on an in-band optical signal-to-noise ratio monitoring technique for wavelength division multiplexed channels. Our proposal relies on the different degree of polarization between the signal (highly polarized) and the noise (not polarized). Using this principle, we divide the signal under test into two orthogonal polarization components and induce a differential group delay via a controlled birefringence apparatus that produces a wavelength-dependent shift of the polarization state of the signal. After a linear polarizing filter, high-resolution spectral analysis allows measurement of the amplified spontaneous emission noise level. The method is tested by experimental measurements of a 40 Gbit/s differential phase-shift keying channel showing very good performance.

© 2010 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.4510) Fiber optics and optical communications : Optical communications
(300.6320) Spectroscopy : Spectroscopy, high-resolution

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 23, 2010
Revised Manuscript: September 28, 2010
Manuscript Accepted: October 5, 2010
Published: November 3, 2010

Citation
Juan José Martínez, Asier Villafranca, Carlos D. Heras, Maria I. Roche, Jesús M. Subias, Javier Pelayo, Enrique Pellejer, Pilar Blasco, and Juan I. Garcés, "In-band optical signal-to-noise ratio monitoring method based on high-resolution polarization analysis and induced differential group delay," Appl. Opt. 49, 6213-6216 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-32-6213

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