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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 5 — Feb. 28, 2011
  • pp: 3937–3944

Real-time ultrawide-band group delay profile monitoring through low-noise incoherent temporal interferometry

Yongwoo Park, Antonio Malacarne, and José Azaña  »View Author Affiliations

Optics Express, Vol. 19, Issue 5, pp. 3937-3944 (2011)

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A simple, highly accurate measurement technique for real-time monitoring of the group delay (GD) profiles of photonic dispersive devices over ultra-broad spectral bandwidths (e.g. an entire communication wavelength band) is demonstrated. The technique is based on time-domain self-interference of an incoherent light pulse after linear propagation through the device under test, providing a measurement wavelength range as wide as the source spectral bandwidth. Significant enhancement in the signal-to-noise ratio of the self-interference signal has been observed by use of a relatively low-noise incoherent light source as compared with the theoretical estimate for a white-noise light source. This fact combined with the use of balanced photo-detection has allowed us to significantly reduce the number of profiles that need to be averaged to reach a targeted GD measurement accuracy, thus achieving reconstruction of the device GD profile in real time. We report highly-accurate monitoring of (i) the group-delay ripple (GDR) profile of a 10-m long chirped fiber Bragg grating over the full C band (~42 nm), and (ii) the group velocity dispersion (GVD) and dispersion slope (DS) profiles of a ~2-km long dispersion compensating fiber module over an ~72-nm wavelength range, both captured at a 15 frames/s video rate update, with demonstrated standard deviations in the captured GD profiles as low as ~1.6 ps.

© 2011 OSA

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2340) Fiber optics and optical communications : Fiber optics components
(230.1480) Optical devices : Bragg reflectors
(230.2035) Optical devices : Dispersion compensation devices
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: December 13, 2010
Revised Manuscript: January 27, 2011
Manuscript Accepted: February 2, 2011
Published: February 14, 2011

Yongwoo Park, Antonio Malacarne, and José Azaña, "Real-time ultrawide-band group delay profile monitoring through low-noise incoherent temporal interferometry," Opt. Express 19, 3937-3944 (2011)

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