PATENT CLAIM ANALYSIS

Application Number: 15915032
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-07
Patent Classification: ["398", "186000"]

Abstract:
A method and apparatus for characterizing and compensating optical impairments in an optical transmitter includes operating an optical transmitter comprising a first and second parent MZ, each comprising a plurality of child MZ modulators that are biased at respective initial operating points. An electro-optic RF transfer function is generated for each of the plurality of child MZ modulators. Curve fitting parameters are determined for each of the plurality of electro-optic RF transfer functions and operating points of each child MZ modulator are determined using the curve fitting parameters. An IQ power imbalance is determined using the curve fitting parameters. Initial RF drive power levels are determined that compensate for the determined IQ power imbalance. The XY power imbalance is determined for initial RF drive power levels using the curve fitting parameters. The operating RF drive powers are determined that at least partially compensate for the first and second IQ power imbalances and for the XY power imbalance for the optical transmitter. An optical signal comprising a Nyquist-pulse-shape is generated at an output of the optical transmitter.

Claim (Index 42):
An optical transmitter that characterizes and compensates for optical impairments, the optical transmitter comprising:\n a) a first parent Mach-Zehnder (MZ) modulator comprising a plurality of child MZ modulators, the first parent MZ modulator generating an X-polarized modulated optical beam; b) a second parent Mach-Zehnder (MZ) modulator comprising a plurality of child MZ modulators, the second parent MZ modulator generating an Y-polarized modulated optical beam, the first and second parent MZ modulator configured to form a dual-polarization optical transmitter that generates wavelength tunable modulated optical signals; c) a plurality of modulator drive amplifiers, each of the plurality of modulator drive amplifiers supplying modulation signals to respective child MZ modulators; d) a tunable laser source having an output that is optically coupled to an optical input of the dual-polarization optical transmitter; e) an optical photodetector having an input that is optically coupled to an output of the dual-polarization optical transmitter, the optical photodetector detecting RF modulation initiated by a signal generator and imposed by the child MZ modulators onto the wavelength tunable optical signals generated by the first and second parent MZ modulator configured to form the dual-polarization optical transmitter; and f) a digital signal processor comprising a plurality of digital-to-analog converters each having a plurality of RF outputs that are electrically connected to respective RF inputs of the plurality of modulator drive amplifiers that drive the child MZ modulators, the digital signal processor being configured to cycle RF modulation signals so that responses of each child MZ modulator to the RF modulation signals can be characterized, the digital signal processor having an input that is electrically connected to the optical photodetectors and configured to:\n i. generate an electro-optic RF transfer function for each of the plurality of child MZ modulators; \n ii. determine curve fitting parameters for each of the plurality of electro-optic RF transfer functions; \n iii. determine operating points of each of the plurality of child MZ modulators using the curve fitting parameters; \n iv. determine an IQ power imbalance at a particular operating point for each of the first and the second parent MZ modulators using the curve fitting parameters for each of the plurality of electro-optic RF transfer functions; \n v. determine initial RF input drive power levels applied to each of the plurality of child MZ modulators that compensate for the determined IQ power imbalance for each of the first and the second parent MZ modulators; \n vi. determine XY power imbalance of the optical transmitter at the determined initial RF input drive power levels using the curve fitting parameters; and \n vii. determine operating RF input drive power levels that at least partially compensate for the first and second IQ power imbalances and for the XY power imbalance of the optical transmitter.

Metadata:
- Claim Count in Document: 16.0
- Percentile: 90.0
- Lexical Diversity: 2.80303
- Patent Class: 398.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14975738', '15488507', '15264239', '13553936', '15774897']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6404534464947612
- 35 USC 102 Novelty (BERT): 0.5943818428241773
- Combined Prediction Score: 0.6358462861277029
- Mean Citation Score: 287.974008
- Max Citation Score: 450.2498
- Similarity Product: 443.4726039208888

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