Method and arrangement for signal transmission and compensation of back reflections in optical access pon systems
AssigneeXieon Networks S.a.r.l.
InventorThomas TREYER
Life of this patent
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Abstract
In a network terminal (ONU) of an optical network near end crosstalk (NEC) is compensated by a digital generated cancellation signal. To establish a connection with another terminal (OLT) signals avoiding NEC are transmitted and the compensation is performed while the power of the transmitted signal is increased in steps.
Claims11
A method for signal transmission and compensating near end crosstalk in an optical network transmitting data signals between line terminals emitting and receiving optical signals, comprising the steps of:
- calculating in the digital domain a compensation signal corresponding to a crosstalk signal transformed into the electrical domain;
- attenuating and phase shifting the compensation signal achieving a digital cancellation signal;
- and
- subtracting the cancellation signal from a received, demodulated and analog-digital converted signal or after digital-analog conversion of the cancellation signal directly from the demodulated signal.
An optical network element including a data source, a digital-analog-converter, an optical transmitter in a transmitting part;
- and an optical receiver, an analog-digital-converter, and a digital receiver in a receiving part, comprising:
- a cancellation path including a modulation simulator, a phase shifter, and a digital attenuator connected in series and generating a cancellation signal, which is subtracted from a received signal in a digital or electrical domain.
Dependencies are inferred from the claim text.