Electrical duobinary soft information receiver for NRZ modulation fiber transmission
AssigneeMaxLinear, Inc.
InventorRainer Strobel
Life of this patent
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Abstract
A receiver circuit is disclosed and is configured to receive an optical signal. The receiver circuit includes a receiving circuit configured to receive the optical signal and convert the optical signal from a duobinary signal format into a binary signal based on a plurality of decision thresholds. The receiver circuit also includes a clock data recovery circuit configured to sample the binary signal per data period at a first time instant based on a predetermined clock data recovery technique, and sample the binary signal per data period at a second time instant offset from the first instant, as well as determine an intermediate sample based on an offset for decoding a transmitted bit sequence according to soft information based on the samples.
Claims8
An apparatus of a passive optical network (PON) receiver configured to perform electrical duobinary demodulation in a PON network, comprising:
- an electrical duobinary receiver comprising a receiver circuit configured to receive an optical signal and convert the optical signal from an electrical duobinary signal format into a binary signal based on a plurality of decision thresholds, and
- a decoder circuit that is configured to receive the binary signal and sample the binary signal based on an over-sampled binary signal and provide soft information derived from an output of a clock data recovery circuit,
- wherein the decoder circuit comprises a forward error correction (FEC) decoder configured to receive the soft information output signal, and generate a bit sequence based on the soft information.
Dependencies are inferred from the claim text.