PATENT CLAIM ANALYSIS

Application Number: 15774897
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-11
Patent Classification: ["398", "183000"]

Abstract:
An optical transmitter includes: an optical modulator including an MZ interferometer, a drive signal input electrode, and a phase difference adjustment bias electrode; a drive amplifier; a phase difference adjustment bias voltage generator; a dithering unit that applies dithering of a predetermined frequency to an amplitude of a drive signal or to a half-wave voltage of the MZ interferometer; a controller unit that changes a phase difference adjustment bias voltage based on a modulation component of the frequency that is superimposed onto modulated light that is output from the optical modulator, to thereby bias the MZ interferometer to a null point; and a synchronous detection circuit that synchronously detects the modulation component of the frequency that is superimposed onto the modulated light. The controller unit changes the phase difference adjustment bias voltage such that a result of synchronous detection by the synchronous detection circuit becomes maximized or minimized. Whether the controller unit maximizes or minimizes the result of synchronous detection is determined by a difference between a phase of a referenced clock signal and a phase of the dithering, and does not depend on the amplitude of the drive signal.

Claim (Index 1):
An optical transmitter comprising:\n an optical modulator comprising\n an MZ interferometer that comprises two optical waveguides, \n a drive signal input electrode that applies a drive signal that changes an optical phase of two optical signals, the two optical signals respectively propagating through the two optical waveguides, and a phase difference adjustment bias electrode that applies a phase difference adjustment bias voltage, the phase difference adjustment bias voltage adjusting the optical phase difference of the two signals by changing the optical phase of the two optical signals; a drive amplifier that generates the drive signal and applies it to the drive signal input electrode; a phase difference adjustment bias voltage generator that generates the phase difference adjustment bias voltage and applies it to the phase difference adjustment bias electrode; a dithering unit that applies dithering of a predetermined frequency to an amplitude of the drive signal or to a half-wave voltage of the MZ interferometer; a controller unit that changes the phase difference adjustment bias voltage generated by the phase difference adjustment bias voltage generator based on an intensity modulation component of the frequency that is superimposed onto modulated light that is output from the optical modulator, to thereby bias the MZ interferometer to a null point; a photodetector that receives the modulated light that is output from the optical modulator and converts it into an electric signal; and a synchronous detection circuit that synchronously detects the intensity modulation component of the frequency that is superimposed onto the converted electric signal, wherein the controller unit changes the phase difference adjustment bias voltage generated by the phase difference adjustment bias voltage generator such that a result of synchronous detection by the synchronous detection circuit becomes maximized or minimized, to thereby bias the MZ interferometer to the null point, and whether the controller unit maximizes or minimizes the result of synchronous detection is determined by a difference between a phase of a referenced clock signal and a phase of the dithering, and does not depend on the amplitude of the drive signal.

Metadata:
- Claim Count in Document: 8.0
- Percentile: 93.0
- Lexical Diversity: 2.67105
- Patent Class: 398.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14934263', '15172289', '11275420', '13393101', '14575020']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7037346695256409
- 35 USC 102 Novelty (BERT): 0.5156600745488376
- Combined Prediction Score: 0.6849272100279605
- Mean Citation Score: 272.431164
- Max Citation Score: 285.2637
- Similarity Product: 243.04173032972213

Labels:
- Claim Label 101: 1
- Claim Label 102: 0
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 0
- Label 101 Adjusted: 1

Dataset: test