Channel Enlargement of PON System Using Nonreciprocal Multiplexing Filter Based on CWDM

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Executive Summary

The authors propose a nonreciprocal filter based on Coarse Wavelength Division Multiplexing (CWDM) that reduces the upstream channel insertion loss in a Passive Optical Network (PON). They also propose a method to increase the number of channels/Optical Network Units (ONUs) in PON systems using the proposed filter to reduce the service cost per subscriber. Experimental results show that the PON system with the proposed 4-channel filter can reduce the power budget of the upstream and increase the number of ONUs by 3 to 4 times that of a conventional time-division multiplexing PON.

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