Low power optical network unit

Details Low power optical network unit Low power optical network unit

H - Electricity

04

B

H04B 10/148 (2006.01) H04B 10/00 (2006.01) H04B 10/26 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2148154

An optical network unit for use in a switched passive optical network utilizes the high contrast ratio between the energies of optical ringing signals and optical interrogation signals. The receiver of the optical network unit is operated in a low power mode of operation until communication between the central office and subscriber is desired. In the low power mode, a photodetector runs in a photovoltaic mode to charge a sensing capacitor. An optical ringing signal originating in the central office when communication via the ONU is desired creates a voltage signal which is detected by a comparator circuit. When the comparator triggers, it switches on the receiver and directs the output of the photodiode to the receiver for processing of the communication signals received therefrom. On completion of the call, the ONU is returned to the low power state. When an off-hook signal is detected, the ONU interrupts the interrogation signals, thereby indicating to the central office that subscriber initiated communication via the ONU is desired.

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