US 2013/0279903 A1 · Noise Discriminator for Enhanced Noise Detection In A Passive Optical Network Burst Mode Receiver

Abstract

A noise discriminator circuit and a noise discrimination method in a burst mode receiver is configured to determine the validity of an incoming burst signal by analyzing the timing of the signal edges of incoming signal to look for a time duration conforming to the preamble data bits of a valid burst signal. In one embodiment, the noise discriminator circuit and method analyze the time duration between signal edges of the same pulse of an incoming signal. In another embodiment, the noise discriminator circuit and method analyze the time duration between a first set of pulses of an incoming signal and the time duration between signal edges of a second set of pulses of the incoming signal. When the time durations are within a given time range relating to a predetermined timing separation of a valid burst signal, the incoming signal is validated as a valid burst signal.

Claims22

Dependent claims

A method in a burst mode receiver to determine the validity of an incoming burst signal, comprising:

receiving consecutive pulses of an incoming signal;
determining if a first time duration between a signal edge of a first pulse and a signal edge of a second pulse is within a first time range of a predetermined timing separation of a valid burst signal, the first pulse and the second pulse being consecutive pulses;
if the first time duration is within the first time range, determining if a second time duration between the signal edge of the second pulse and a signal edge of a third pulse is within the first time range, the second pulse and the third pulse being consecutive pulses;
if the second time duration is within the first time range, asserting a signal indicative of a valid burst signal;
and
if the first time duration is not within the first time range or the second time duration is not within the first time range, deasserting the signal indicative of a valid burst signal.

3 more elements

A limiting amplifier for a burst mode receiver, comprising:

an amplifier configured to receive and amplify an input signal representative of an incoming burst signal;
a buffer configured to receive the amplified input signal and to generate an output signal;
a noise discriminator circuit configured to receive the amplified input signal and to assert a valid output signal when a first time duration between a signal edge of a first pulse and a signal edge of a second pulse is within a first time range of a predetermined timing separation of a valid burst signal, the first pulse and the second pulse being consecutive pulses, and when a second time duration between the signal edge of the second pulse and a signal edge of a third pulse is within the first time range, the second pulse and the third pulse being consecutive pulses;
and
a signal detect generator circuit configured to assert a signal detect signal when the valid output signal is asserted.

2 more elements

Dependencies are inferred from the claim text.

Noise Discriminator for Enhanced Noise Detection In A Passive Optical Network Burst Mode Receiver

Life of this patent

Noise Discriminator for Enhanced Noise Detection In A Passive Optical Network Burst Mode Receiver

Life of this patent

Abstract

Claims22