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 9):
A method for fabricating a distributed feedback laser, comprising:\n Step (A): applying a semiconductor epitaxy process to form a semiconductor-laminated structure on a semiconductor substrate, the semiconductor-laminated structure generating a laser beam with a laser wavelength upon receiving an electric current, the semiconductor-laminated structure emitting the laser beam from a laser-out surface located at a lateral side of the semiconductor-laminated structure; Step (B): applying e-beam writer and nano imprint processes to form a grating layer on the semiconductor-laminated structure, the grating layer including a plurality of micro-grating structures arranged a horizontal direction, the plurality of micro-grating structures being separated from each other by spacing largely equal to one half of the laser wavelength; and, Step (C): applying a semiconductor epitaxy process and a yellow-light process to form a ridge structure on the grating layer; wherein the grating layer includes, in the horizontal direction, a first grating area, a phase-shift grating structure, a second grating area and a gratingless area, the laser-out surface is adjacent to the second grating area, the phase-shift grating structure is located at a junction area of the first grating area and the second grating area, a width of the phase-shift grating structure provide a phase-difference distance between the micro-grating structures in the first grating area and the micro-grating structures in the second grating area, and the gratingless area containing no said micro-grating structure is located in the second grating area.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 90.0
- Lexical Diversity: 2.22535
- Patent Class: 372.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14182335', '15145951', '13614280', '10636103', '12435562']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8116788923690695
- 35 USC 102 Novelty (BERT): 0.499431515342556
- Combined Prediction Score: 0.7804541546664181
- Mean Citation Score: 240.690956
- Max Citation Score: 248.20692000000005
- Similarity Product: 185.6678366537333

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