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

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 o...

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Bibliographic Details
Published in:Optics express 2012-02, Vol.20 (5), p.4921-4926
Main Authors: Shim, H K, Cho, K Y, Takushima, Y, Chung, Y C
Format: Article
Language:English
Subjects:
Algorithms
Computer Communication Networks - instrumentation
Equipment Design
Equipment Failure Analysis - instrumentation
Fiber Optic Technology - instrumentation
Photometry - instrumentation
Telecommunications - instrumentation
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Summary: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 (
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.20.004921