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US 12,237,870 B2Granted
Data synchronization in optical networks and devices
AssigneeInfinera Corporation
InventorsMehdi Torbatian, Yuliang Gao, Ahmed Morra, Han Henry Sun, Yeongho Park
Life of this patent
Estimating the term…
Abstract
Joint estimation of the framer index and the frequency offset in an optical communication system are described among various other features. A transmitter can transmit data frames using pilot and framer symbols. A receiver can estimate the framer index and frequency offset using the pilot and framer symbols, and identify the beginning of a header portion of a data frame. By identifying the beginning of the header portion of a data frame, the receiver can then process data received from the transmitter in a manner synchronous to the manner in which the data was transmitted by the transmitter.
Claims20
An apparatus, comprising:
- an analog to digital conversion circuitry operable to receive data comprising frames and output digitized data corresponding to the received data;
- and
- a digital signal processor operable to:
- receive the digitized data from the analog to digital conversion circuitry;
- determine a location of a frame header associated with one of the frames, the location having a probability that satisfies a probability threshold;
- and
- estimate a frequency offset associated with the digitized data using the location of the frame header,
- wherein the digital signal processor comprises an AND logic circuit operable to receive confirmation data associated with each subcarrier in the digitized data and to set a barrel shifter flag to a first value when confirmation data for each subcarrier indicates that a framer index estimation associated with the subcarrier is confirmed.
5 more elements
An apparatus, comprising:
- an analog to digital conversion circuitry operable to receive data comprising frames and output digitized data corresponding to the received data;
- and
- a digital signal processor operable to:
- receive the digitized data from the analog to digital conversion circuitry;
- determine a location of a frame header associated with one of the frames, the location having a probability that satisfies a probability threshold;
- and
- estimate a frequency offset associated with the digitized data using the location of the frame header, wherein:
- the digitized data is provided through one or more subcarriers;
- and
- the digital signal processor is operable to compensate a determined location of a frame header for each of the one or more subcarriers in the digitized data such that an order of framer indices for the one or more subcarriers is the same as an order of framer indices implemented by a transmitter that transmitted the data over an optical network and received by the analog to digital conversion circuitry.
7 more elements
An apparatus, comprising:
- an analog to digital conversion circuitry operable to receive data comprising frames and output digitized data corresponding to the received data;
- and
- a digital signal processor operable to:
- receive the digitized data from the analog to digital conversion circuitry;
- determine a location of a frame header associated with one of the frames, the location having a probability that satisfies a probability threshold;
- and
- estimate a frequency offset associated with the digitized data using the location of the frame header, wherein the digital signal processor comprises:
- a quantizer to quantize the digitized data;
- and
- a soft framer circuit to receive the quantized digitized data from the quantizer and determine the location of the frame header.
7 more elements
An apparatus, comprising:
- an analog to digital conversion circuitry operable to receive data comprising frames and output digitized data corresponding to the received data;
- and
- a digital signal processor operable to:
- receive the digitized data from the analog to digital conversion circuitry;
- determine a location of a frame header associated with one of the frames, the location having a probability that satisfies a probability threshold;
- and
- estimate a frequency offset associated with the digitized data using the location of the frame header, wherein the digital signal processor is operable to determine the location of the frame header based on estimating locations of frame headers for a plurality of frames in the digitized data.
4 more elements
A receiver operable to communicate with a transmitting device over an optical network, the receiver comprising:
- an optics circuit configured to receive a signal comprising subcarrier signals, each of the subcarrier signals comprising a data frame that comprises (i) a frame header comprising framer symbols and a first set of pilot symbols, and (ii) a payload comprising payload symbols and a second set of pilot symbols;
- a digital signal processor operable, for each of one or more subcarrier signals respectively, to:
- determine a location of a frame header of the data frame in the subcarrier signal;
- and
- estimate a frequency offset associated with the data frame using the location of the frame header.
2 more elements
Dependencies are inferred from the claim text.