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Reflections and Multiple Rayleigh Backscattering in WDM Single-Fiber Loopback Access Networks

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3 Author(s)
Arellano, C. ; VPIphotonics, Berlin ; Langer, K.-D. ; Prat, J.

The optical gain of reflective optical network units (ONUs) may produce a critical amplifying feedback on the single-fiber transmission impairments. In this paper, its influence on the passive optical networks transmission with reflective-ONU is theoretically analyzed and experimentally confirmed. Analytical expressions for the optical crosstalk-to-signal ratio and the Q-parameter in presence of Rayleigh backscattering, reflection interferences and ASE noise are given. As a resulting design guideline, the ONU gain should be adjusted to about 3 dB below the total link loss; in addition, component return loss at the drop section must be higher than 30 dB. Experimental results with two basic types of reflective-ONUs, namely a loop structure formed by a Mach-Zehnder modulator and an optical amplifier, and another one employing a reflective-SOA, are in agreement with the theoretical approach.

Published in:

Lightwave Technology, Journal of  (Volume:27 ,  Issue: 1 )

Date of Publication:

Jan.1, 2009

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