PATENT CLAIM ANALYSIS

Application Number: 15966697
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2019-10
Patent Classification: ["398", "208000"]

Abstract:
A coherent optical receiver in which the channel equalizer and the clock-recovery circuit are connected in a nested-loop configuration, wherein the channel estimate generated by the equalizer is used to adjust the phase of the clock signal generated by the clock-recovery circuit. The channel equalizer can be implemented using a bank of time-domain or frequency-domain FIR filters. In an example embodiment, the clock-recovery circuit is configured to track the phase rotation corresponding to the equalized signals in a frequency-dependent manner; track the phase rotation in the channel equalizer either in a frequency-dependent manner or based on the mean signal delay therein; and adjust the phase of the clock signal based on an effective difference between these two phase rotations. The clock-recovery circuit enhances the clock tone by applying a Fourier transform to the squared absolute values of the equalized signals outputted by the channel equalizer.

Claim (Index 25):
An apparatus comprising an optical data receiver that comprises:\n an optical front end that comprises:\n an optical hybrid configured to mix an optical data signal and an optical local-oscillator signal to generate a plurality of mixed optical signals; and \n a plurality of photodetectors configured to generate a plurality of electrical digital measures of the optical data signal in response to the mixed optical signals; and \n a digital signal processor that comprises:\n a digital equalizing filter configured to generate a second plurality of digital samples by digitally filtering a first plurality of digital samples, said filtering being based on a transfer function, said first plurality of digital samples being generated in response to the plurality of electrical digital measures and a clock signal; \n a clock-recovery circuit configured to generate the clock signal using at least some of the second plurality of digital samples and the transfer function; \n a signal decoder configured to recover data encoded in the optical data signal using the second plurality of digital samples; \n wherein the second plurality of digital samples comprises a first stream of digital samples corresponding to a first polarization of the optical data signal and a second stream of digital samples corresponding to a second polarization of the optical data signal that is orthogonal to the first polarization; and wherein the clock-recovery circuit is configured to generate the clock signal in response to a selected one of the first and second streams of digital samples.

Metadata:
- Claim Count in Document: 42.0
- Percentile: 91.0
- Lexical Diversity: 2.01316
- Patent Class: 398.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14319866', '14500239', '15376319', '15376337', '15376361']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6318782266303177
- 35 USC 102 Novelty (BERT): 0.4980395516105739
- Combined Prediction Score: 0.6184943591283433
- Mean Citation Score: 202.845026
- Max Citation Score: 208.35687
- Similarity Product: 170.89156559140918

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test