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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 5 — Feb. 27, 2012
  • pp: 4921–4926

Correlation-based OTDR for in-service monitoring of 64-split TDM PON

H. K. Shim, K. Y. Cho, Y. Takushima, and Y. C. Chung  »View Author Affiliations

Optics Express, Vol. 20, Issue 5, pp. 4921-4926 (2012)

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We demonstrate that the correlation-based optical time domain reflectometer (OTDR) can be used for the in-service monitoring of the 64-split time-division-multiplexed passive optical network (TDM PON). To achieve this objective, we superimpose a pseudo noise (PN) sequence having a modulation depth of ~40% to the downstream signal and utilize it for the correlation detection. However, the use of such a large PN sequence can seriously deteriorate the performance of the downstream receiver. Thus, we apply 8B/10B encoding to the downstream signal, and then filter out the PN sequence at the downstream receiver by using a high-pass filter. As a result, the power penalty caused by the use of a large PN sequence is reduced to an acceptable level (<3 dB), while the dynamic range of this correlation-based OTDR is increased to ~30 dB. We then evaluate the performance of the proposed OTDR in the fiber link similar to the optical distribution network of the 64-split TDM PON. The results show that this OTDR can detect both the reflective and non-reflective events occurred in the feeder fiber as well as the reflective events in the drop fibers even in the 64-split TDM PON.

© 2012 OSA

OCIS Codes
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(120.4825) Instrumentation, measurement, and metrology : Optical time domain reflectometry

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 3, 2012
Revised Manuscript: February 6, 2012
Manuscript Accepted: February 6, 2012
Published: February 13, 2012

H. K. Shim, K. Y. Cho, Y. Takushima, and Y. C. Chung, "Correlation-based OTDR for in-service monitoring of 64-split TDM PON," Opt. Express 20, 4921-4926 (2012)

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