PATENT CLAIM ANALYSIS

Application Number: 15922611
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2019-04
Patent Classification: ["372", "050110"]

Abstract:
A structure of distributed feedback (DFB) laser includes a grating layer having a phase-shift grating structure and a gratingless area. In addition, both side-surfaces of the DFB laser are coated with anti-reflection coating to improve SMSR and to obtain good slope efficiency (SE). The grating layer is divided by the phase-shift grating structure in a horizontal direction into a first grating area and a second grating area adjacent to a laser-out surface of the DFB laser. The phase-shift grating structure provides a phase-difference distance, such that a shift of phase exists between the micro-grating structures located within the first grating area and the other micro-grating structures located within the second grating area. The gratingless area located within the second grating area contains no micro-grating structure, and moreover, the gratingless area will not change the phase of the micro-grating structures located within the second grating area.

Claim (Index 2):
The distributed feedback laser structure of  claim 1 , wherein the phase-difference distance provided by the phase-shift grating structure is equal to one quarter of the laser wavelength, a width of the gratingless area is at least larger than 10 times of the laser wavelength, and the width of the gratingless area is an integer multiple of one half of the laser wavelength, such that a phase of the micro-grating structures in the second grating area is kept no change.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 90.0
- Lexical Diversity: 2.22535
- Patent Class: 372.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['14182335', '15145951', '13614280', '10636103', '12435562']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8277126641133624
- 35 USC 102 Novelty (BERT): 0.5133505231014783
- Combined Prediction Score: 0.796276450012174
- Mean Citation Score: 240.690956
- Max Citation Score: 248.20692000000005
- Similarity Product: 155.6466811568499

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

Dataset: test