# US 2014/0153600 A1 · Optical Light Source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153600 A1 - Document ID: US20140153600A1 - Status: Published application - Kind: A1 - Application number: 14/090,543 - Filed: 2013-11-26 - Published: 2014-06-05 - Earliest claimed: 2012-11-29 - Assignees: Agency for Science, Technology and Research - Applicants: Agency for Science, Technology and Research - Inventors: Xianshu LUO; Junfeng SONG; Haifeng ZHOU; Tsung-Yang LIOW; Mingbin YU; Patrick Guo-Qiang LO - Web page: https://patentgrep.com/patent/US20140153600A1 ## CPC - H01S 5/1032: {Coupling to elements comprising an optical axis that is not aligned with the optical axis of the active region} - B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals - H01S 5/021: {Silicon based substrates} - H01S 5/0657: {Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity} - H01S 5/1014: {Tapered waveguide, e.g. spotsize converter (H01S5/1064 takes precedence)} - H01S 5/125: Distributed Bragg reflector [DBR] lasers - H01S 5/343: in AIIIBV compounds, e.g. AlGaAs-laser {, InP-based laser} - H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract An optical light source is provided. The optical light source includes a waveguide including two reflectors arranged spaced apart from each other to define an optical cavity therebetween, an optical gain medium, and a coupling structure arranged to couple light between the optical cavity and the optical gain medium. ## Claims ### Claim 1 An optical light source comprising: a waveguide comprising two reflectors arranged spaced apart from each other to define an optical cavity therebetween; an optical gain medium; and a coupling structure arranged to couple light between the optical cavity and the optical gain medium. ### Claim 2 (depends on 1) The optical light source as claimed in claim 1, wherein the coupling structure is arranged spaced apart from at least one of the optical cavity or the optical gain medium. ### Claim 3 (depends on 1) The optical light source as claimed in claim 1, wherein the waveguide comprises a material capable of inducing a propagation loss of less than 2 dB/cm. ### Claim 4 (depends on 1) The optical light source as claimed in claim 1, wherein the waveguide comprises at least one of a silicon nitride-based material or silicon oxynitride-based material. ### Claim 5 (depends on 1) The optical light source as claimed in claim 1, wherein the coupling structure is embedded in the waveguide. ### Claim 6 (depends on 1) The optical light source as claimed in claim 1, wherein the coupling structure has a refractive index in between respective refractive indices of the waveguide and the optical gain medium. ### Claim 7 (depends on 1) The optical light source as claimed in claim 1, wherein the coupling structure has a thickness between about 50 nm and about 500 nm. ### Claim 8 (depends on 1) The optical light source as claimed in claim 1, wherein the coupling structure comprises amorphous silicon or poly-crystalline silicon. ### Claim 9 (depends on 1) The optical light source as claimed in claim 1, wherein the optical gain medium comprises a multiple quantum well region. ### Claim 10 (depends on 1) The optical light source as claimed in claim 1, wherein the optical gain medium comprises a cladding layer. ### Claim 11 (depends on 10) The optical light source as claimed in claim 10, wherein the cladding layer has a thickness between about 0.1 μm and about 1.5 μm. ### Claim 12 (depends on 1) The optical light source as claimed in claim 1, wherein a section of the optical gain medium is configured as a saturable absorber section. ### Claim 13 (depends on 1) The optical light source as claimed in claim 1, wherein the optical gain medium comprises a III-V material. ### Claim 14 (depends on 1) The optical light source as claimed in claim 1, wherein at least one of the two reflectors comprises a Bragg reflector. ### Claim 15 (depends on 1) The optical light source as claimed in claim 1, wherein at least one of the coupling structure or the optical gain medium comprises a tapering region. ### Claim 16 (depends on 1) The optical light source as claimed in claim 1, wherein the waveguide comprises a first waveguide section and a second waveguide section spaced apart from the first waveguide section, and wherein the coupling structure comprises: a first coupling section arranged to couple light between the first waveguide section and the optical gain medium; and a second coupling section spaced apart from the first coupling section, the second coupling section arranged to couple light between the second waveguide section and the optical gain medium. ### Claim 17 (depends on 16) The optical light source as claimed in claim 16, wherein the first waveguide section and the first coupling section are arranged spaced apart from each other, and wherein the second waveguide section and the second coupling section are arranged spaced apart from each other. ### Claim 18 (depends on 16) The optical light source as claimed in claim 16, wherein the optical gain medium is arranged spaced apart from the first coupling section and the second coupling section. ### Claim 19 An optical light source comprising: a waveguide comprising two Bragg reflectors arranged spaced apart from each other to define an optical cavity therebetween, wherein the waveguide comprises at least one of a silicon nitride-based material or silicon oxynitride-based material; and an optical gain medium optically coupled to the optical cavity. ### Claim 20 (depends on 19) The optical light source as claimed in claim 19, further comprising a coupling structure arranged to couple light between the optical cavity and the optical gain medium.