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Carrier-To-Noise Ratio In Coherent Systems

9006-017

 

Carrier-To-Noise Ratio In Coherent Systems (Graph) (15872 bytes)

 

This graph shows how the CNR in an optical heterodyne receiver varies with received optical power and local oscillator power.  At local oscillator power levels of about 0 dBm (1 mW), the receiver is substantially quantum noise limited.

 

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