PATENT CLAIM ANALYSIS

Application Number: 16039560
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2020-01
Patent Classification: ["398", "202000"]

Abstract:
A self-coherent optical data receiver configured to use direct detection of optical signals that is compatible with full (amplitude/phase) electric-field reconstruction. To enable the latter, the direct-detected optical signal includes CW light whose carrier frequency is spectrally aligned with a roll-off edge of the data-modulated portion of the signal. In an example embodiment, the receiver may employ two digital filters placed upstream and downstream, respectively, of the field-reconstruction circuit. The upstream filter is configurable to at least partially cancel the effects of SSBI caused by the direct detection. The downstream filter can be configured to perform electronic dispersion compensation and/or electronic polarization demultiplexing. In different embodiments, a filter controller may operate to adaptively change the filter coefficients of the upstream filter based on different signals generated within the digital receive chain. For example, the filter controller can use either input or output of the downstream filter for this purpose.

Claim (Index 1):
An apparatus, comprising an analog front end and a digital signal processor;\n wherein the analog front end comprises a photodetector configured to convert an optical input signal into an electrical signal proportional to an optical power of the optical input signal; wherein the digital signal processor comprises a first digital filter and a field-reconstruction circuit, the first digital filter being configured to generate a first filtered digital signal in response to the electrical signal, the field-reconstruction circuit being configured to estimate at least a phase of the optical input signal in response to the first filtered digital signal; wherein the first digital filter is configurable to digitally filter a digital representation of the electrical signal to remove therefrom at least some signal distortions imposed by the analog front end; and wherein the field-reconstruction circuit is configured to use a Kramers-Kronig algorithm to estimate said at least a phase of the optical input signal based on the first filtered digital signal.

Metadata:
- Claim Count in Document: 50.0
- Percentile: 95.0
- Lexical Diversity: 1.64
- Patent Class: 398.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14575596', '15475300', '15966697', '15434687', '14154370']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6711445838978629
- 35 USC 102 Novelty (BERT): 0.4827999031588145
- Combined Prediction Score: 0.6523101158239581
- Mean Citation Score: 177.57446199999995
- Max Citation Score: 182.13019
- Similarity Product: 148.01927406051516

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