# US 12,191,627 B2 · Optical module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,627 B2 - Document ID: US12191627B2 - Status: Granted - Kind: B2 - Application number: 17/397,020 - Filed: 2021-08-09 - Published: 2021-11-25 - Granted: 2025-01-07 - Earliest claimed: 2019-02-13 - Assignees: Furukawa Electric Co., Ltd. - Applicants: Furukawa Electric Co., Ltd. - Inventors: Kazuki Yamaoka; Maiko Ariga; Yusuke Inaba - Web page: https://patentgrep.com/patent/US12191627B2 ## CPC - H01S 5/02325: Mechanically integrated components on mount members or optical micro-benches - H01S 5/0239: Combinations of electrical or optical elements - H01S 5/0064: {Anti-reflection components, e.g. optical isolators} - H01S 5/02218: Material of the housings; Filling of the housings - H01S 5/02253: using lenses - H01S 5/02469: {Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC} - H01S 5/02208: characterised by the shape of the housings - H01S 5/02257: using windows, e.g. specially adapted for back-reflecting light to a detector inside the housing - H01S 5/02415: {by using a thermo-electric cooler [TEC], e.g. Peltier element} - H01S 5/02438: {Characterized by cooling of elements other than the laser chip, e.g. an optical element being part of an external cavity or a collimating lens} - H01S 5/142: {which comprises an additional resonator} - 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 An optical module includes: an optical functional element outputting a first light beam; a first optical part receiving the first light beam, having a predetermined effect on the first light beam, and outputting the affected first light beam as a second light beam; a second optical part receiving the second light beam, having a predetermined effect on the second light beam, outputting the affected second light beam as a third light beam, and reflecting a reflected light beam in a direction not coupled to the first optical part, the reflected light beam being generated from the second light on an incident surface on which the second light beam is incident; a housing accommodating the optical functional element, the first optical part, and the second optical part; and an optical attenuator provided inside the housing and attenuating power of the reflected light beam incident on the optical attenuator. ## Claims ### Claim 1 An optical module comprising: an optical functional element configured to output a first light beam; a first optical part configured to receive the first light beam, have a predetermined effect on the first light beam, and output the affected first light beam as a second light beam; a second optical part configured to receive the second light beam, have a predetermined effect on the second light beam, output the affected second light beam as a third light beam, and reflect a reflected light beam in a direction not coupled to the first optical part, the reflected light beam being generated from the second light on an incident surface on which the second light beam is incident; a housing accommodating the optical functional element, the first optical part, and the second optical part; and an optical attenuator provided inside the housing and configured to attenuate power of the reflected light beam incident on the optical attenuator in the housing, wherein the optical attenuator is provided to a part of the housing and is configured to attenuate the reflected light beam by scattering, absorption, or transmission, and wherein the optical attenuator includes resin that scatters the reflected light beam. ### Claim 2 (depends on 1) The optical module according to claim 1, wherein the first optical part is a lens. ### Claim 3 (depends on 1) The optical module according to claim 1, wherein the second optical part is an optical isolator. ### Claim 4 (depends on 1) The optical module according to claim 1, wherein the housing has a height of 6.5 mm or lower. ### Claim 5 (depends on 1) The optical module according to claim 1, wherein the resin includes filler particles having a particle size of 0.1 μm to 500 μm. ### Claim 6 (depends on 1) The optical module according to claim 1, wherein an angle formed by an optical axis of the first light beam and an optical axis of the reflected light beam is 20 degrees or larger. ### Claim 7 (depends on 1) The optical module according to claim 1, wherein a distance between a position at which the second light beam is output from the first optical part and a position at which the second light beam is incident on the incident surface of the second optical part is 0.3 mm or larger. ### Claim 8 (depends on 1) The optical module according to claim 1, wherein a distance between an optical axis of the second light beam and an optical axis of the third light beam is 300 μm or smaller. ### Claim 9 (depends on 1) The optical module according to claim 1, wherein a wavelength of the first light beam is in a range of 900 nm to 1650 nm. ### Claim 10 An optical module comprising: an optical functional element configured to output a first light beam; a first optical part configured to receive the first light beam, have a predetermined effect on the first light beam, and output the affected first light beam as a second light beam; a second optical part configured to receive the second light beam, have a predetermined effect on the second light beam, output the affected second light beam as a third light beam, and reflect a reflected light beam in a direction not coupled to the first optical part, the reflected light beam being generated from the second light on an incident surface on which the second light beam is incident; a housing accommodating the optical functional element, the first optical part, and the second optical part; and an optical attenuator provided inside the housing and configured to attenuate power of the reflected light beam incident on the optical attenuator in the housing, wherein the optical attenuator is provided to a part of the housing and is configured to attenuate the reflected light beam by scattering, absorption, or transmission, and wherein the optical attenuator is formed by performing a surface treatment on the part of the housing. ### Claim 11 (depends on 10) The optical module according to claim 10, wherein the housing has a height of 6.5 mm or lower. ### Claim 12 (depends on 10) The optical module according to claim 10, wherein an angle formed by an optical axis of the first light beam and an optical axis of the reflected light beam is 20 degrees or larger. ### Claim 13 (depends on 10) The optical module according to claim 10, wherein a distance between a position at which the second light beam is output from the first optical part and a position at which the second light beam is incident on the incident surface of the second optical part is 0.3 mm or larger. ### Claim 14 (depends on 10) The optical module according to claim 10, wherein a distance between an optical axis of the second light beam and an optical axis of the third light beam is 300 μm or smaller. ### Claim 15 (depends on 10) The optical module according to claim 10, wherein a wavelength of the first light beam is in a range of 900 nm to 1650 nm. ### Claim 16 An optical module comprising: an optical functional element configured to output a first light beam; a first optical part configured to receive the first light beam, have a predetermined effect on the first light beam, and output the affected first light beam as a second light beam; a second optical part configured to receive the second light beam, have a predetermined effect on the second light beam, output the affected second light beam as a third light beam, and reflect a reflected light beam in a direction not coupled to the first optical part, the reflected light beam being generated from the second light on an incident surface on which the second light beam is incident; a housing accommodating the optical functional element, the first optical part, and the second optical part; and an optical attenuator provided inside the housing and configured to attenuate power of the reflected light beam incident on the optical attenuator in the housing, wherein the optical attenuator is provided to a part of the housing and is configured to attenuate the reflected light beam by scattering, absorption, or transmission, and wherein the optical attenuator is a translucent window provided to the part of the housing. ### Claim 17 (depends on 16) The optical module according to claim 16, wherein the housing has a height of 6.5 mm or lower. ### Claim 18 (depends on 16) The optical module according to claim 16, wherein an angle formed by an optical axis of the first light beam and an optical axis of the reflected light beam is 20 degrees or larger. ### Claim 19 (depends on 16) The optical module according to claim 16, wherein a distance between a position at which the second light beam is output from the first optical part and a position at which the second light beam is incident on the incident surface of the second optical part is 0.3 mm or larger. ### Claim 20 (depends on 16) The optical module according to claim 16, wherein a distance between an optical axis of the second light beam and an optical axis of the third light beam is 300 μm or smaller.