# US 2014/0192827 A1 · Resonator, variable wavelength optical filter, and variable wavelength laser diode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192827 A1 - Document ID: US20140192827A1 - Status: Published application - Kind: A1 - Application number: 14/020,928 - Filed: 2013-09-09 - Published: 2014-07-10 - Earliest claimed: 2013-01-08 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Kwang Ryong OH - Web page: https://patentgrep.com/patent/US20140192827A1 ## CPC - G02B 6/10: of the optical waveguide type (G02B6/02, G02B6/24 take precedence; devices or arrangements for the control of light by electric, magnetic, electro-magnetic or acoustic means G02F1/00; transferring the modulation of modulated light G02F2/00; optical logic elements G02F3/00; optical analogue/digital converters G02F7/00) - G01J 3/10: Arrangements of light sources specially adapted for spectrometry or colorimetry - G01J 3/26: using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filters - G02B 6/29358: {Multiple beam interferometer external to a light guide, e.g. Fabry-Pérot, etalon, VIPA plate, OTDL plate, continuous interferometer, parallel plate resonator (G02B6/29347, G02B6/29349, G02B6/2935, G02B6/29361 take precedence; resonator evanescently coupled to light guide G02B6/29335)} - H01S 5/06: Arrangements for controlling the laser output parameters, e.g. by operating on the active medium - H01S 5/142: {which comprises an additional resonator} - H01S 5/0287: {Facet reflectivity} - H01S 5/101: {Curved waveguide (H01S5/1243 takes precedence)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - 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 ## Abstract A variable wavelength diode according to the inventive concept includes a resonator and a plurality of cylindrical lenses. The resonator includes slab waveguides of which resonance lengths are different from each other. The slab waveguides are disposed on a planar light wave circuit (PLC). Thus, the variable wavelength diode realizes a high variation speed and a continuous variation of a beam at the same time. ## Claims ### Claim 1 A resonator comprising: a first slab waveguide; a second slab waveguide spaced apart from the first slab waveguide; and a substrate to which the first and second slab waveguides are connected, wherein a resonance length of the first slab waveguide is different from a resonance length of the second slab waveguide; and wherein the first slab waveguide is electrically and optically independent of the second slab waveguide. ### Claim 2 (depends on 1) The resonator of claim 1, wherein the first slab waveguide and the second slab waveguide divide an input beam into a first part and a second part, so that the first part and the second part of the input beam are outputted through the first slab waveguide and the second slab waveguide, respectively. ### Claim 3 (depends on 1) The resonator of claim 1, wherein each of the first and second slab waveguides has a PN junction structure for electrical current injection. ### Claim 4 (depends on 1) The resonator of claim 1, wherein the first and second slab waveguides are disposed to have a gradient of a predetermined angle from an incidence plane of an input beam in a plan view. ### Claim 5 (depends on 1) The resonator of claim 1, wherein the first and second slab waveguides include a 3-5 group compound semiconductor material. ### Claim 6 A variable wavelength optical filter comprising: a first cylindrical lens receiving a beam, the first cylindrical lens having a central axis perpendicular to an incidence direction of the beam; a second cylindrical lens having a central axis perpendicular to the central axis of the first cylindrical lens, the second cylindrical lens receiving a beam outputted from the first cylindrical lens; a resonator resonating a beam outputted from the second cylindrical lens and outputting the resonated beam; a third cylindrical lens receiving the beam outputted from the resonator, the third cylindrical lens having a central axis parallel to the central axis of the second cylindrical lens; and a fourth cylindrical lens having a central axis perpendicular to the central axis of the third cylindrical lens, the fourth cylindrical lens receiving a beam outputted from the third cylindrical lens. ### Claim 7 (depends on 6) The variable wavelength optical filter of claim 6, further comprising: an optical fiber input terminal connected to a first optical fiber, the optical fiber input terminal inputting the beam from the first optical fiber into the first cylindrical lens; and an optical fiber output terminal connected to a second optical fiber, the optical fiber output terminal outputting the beam from the fourth cylindrical lens into the second optical fiber. ### Claim 8 (depends on 6) The variable wavelength optical filter of claim 6, wherein the resonator comprises: a first slab waveguide; a second slab waveguide spaced apart from the first slab waveguide; and a substrate to which the first and second slab waveguides are connected, wherein a resonance length of the first slab waveguide is different from a resonance length of the second slab waveguide; and wherein the first slab waveguide is electrically and optically independent of the second slab waveguide. ### Claim 9 (depends on 8) The variable wavelength optical filter of claim 8, wherein the first slab waveguide and the second slab waveguide divide an input beam into a first part and a second part, so that the first part and the second part of the input beam are outputted through the first slab waveguide and the second slab waveguide, respectively. ### Claim 10 (depends on 8) The variable wavelength optical filter of claim 8, wherein each of the first and second slab waveguides has a PN junction structure for electrical current injection. ### Claim 11 (depends on 8) The variable wavelength optical filter of claim 8, wherein the first and second slab waveguides are disposed to have a gradient of a predetermined angle from an incidence plane of an input beam in a plan view. ### Claim 12 (depends on 8) The variable wavelength optical filter of claim 8, wherein the first and second slab waveguides include a 3-5 group compound semiconductor material. ### Claim 13 A variable wavelength laser diode comprising: a super-luminescence diode (SLD) receiving and outputting a beam; a first cylindrical lens having a central axis perpendicular to an incidence direction of the beam outputted from the super-luminescence diode, the first cylindrical lens receiving the beam from the super-luminescence diode; a second cylindrical lens having a central axis perpendicular to the central axis of the first cylindrical lens, the second cylindrical lens receiving a beam outputted from the first cylindrical lens; a third cylindrical lens having a central axis parallel to the central axis of the second cylindrical lens, the third cylindrical lens reflecting an input beam by a high-reflective (HR) thin film, and the high-reflective thin film coated on a portion of the third cylindrical lens; and a resonator disposed between the second cylindrical lens and the third cylindrical lens, the resonator outputting a beam from the second cylindrical lens to the third cylindrical lens, and the resonator outputting the beam reflected from the third cylindrical lens into the second cylindrical lens, wherein the first cylindrical lens outputs a beam outputted from the second cylindrical lens into the super-luminescence diode. ### Claim 14 (depends on 13) The variable wavelength laser diode of claim 13, wherein a second of the super-luminescence diode, which is adjacent to the first cylindrical lens, is coated with an anti-reflective thin film for inner resonance; and wherein an input/output section of the super-luminescence diode is coated with a high-reflective thin film. ### Claim 15 (depends on 13) The variable wavelength laser diode of claim 13, wherein the third cylindrical lens includes a first surface and a second surface opposite to each other; wherein the beam is inputted to and outputted from the first surface of the third cylindrical lens; and wherein the high-reflective thin film is disposed on the second surface of the third cylindrical lens. ### Claim 16 (depends on 13) The variable wavelength laser diode of claim 13, wherein the resonator comprises: a first slab waveguide; a second slab waveguide spaced apart from the first slab waveguide; and a substrate to which the first and second slab waveguides are connected, wherein a resonance length of the first slab waveguide is different from a resonance length of the second slab waveguide; and wherein the first slab waveguide is electrically and optically independent of the second slab waveguide. ### Claim 17 (depends on 16) The variable wavelength laser diode of claim 16, wherein the first slab waveguide and the second slab waveguide divide an input beam into a first part and a second part, so that the first part and the second part of the input beam are outputted through the first slab waveguide and the second slab waveguide, respectively. ### Claim 18 (depends on 16) The variable wavelength laser diode of claim 16, wherein each of the first and second slab waveguides has a PN junction structure for electrical current injection. ### Claim 19 (depends on 16) The variable wavelength laser diode of claim 16, wherein the first and second slab waveguides are disposed to have a gradient of a predetermined angle from an incidence plane of an input beam in a plan view. ### Claim 20 (depends on 16) The variable wavelength laser diode of claim 16, wherein the first and second slab waveguides include a 3-5 group compound semiconductor material.