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US 2009/0213461 A1Published application
Optical Module
OwnerNaoko Hikichi, Kenichi Nakama +1inventors
InventorsNaoko Hikichi, Kenichi Nakama, Yasunori Arima
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Abstract
An optical module according to the invention can achieve an optical system using a transmission-type diffraction grating for bending the optical path of incident light with a specific wavelength by about 90°. A substrate of the transmission-type diffraction grating is mounted at an angle in a range of +5° with respect to the design incident angle α of the incident light. The optical system can be applied to a light multiplexing/demultiplexing module.
Claims14
-9. (canceled)
An optical module comprising:
- an optical system using a diffraction optical element for bending an optical axis of an incident light beam with a specific wavelength at about 90°;
- and
- a collimator for substantially collimating the light beam incident on the diffraction optical element.
An optical module comprising:
- an optical system using a diffraction optical element for bending an optical axis of an incident light beam with a specific wavelength at about 90°;
- and
- a converging device for converging the light beam output from the diffraction optical element.
An optical module comprising:
- an optical system using a diffraction optical element for bending an optical axis of an incident light beam with a specific wavelength at about 90°;
- a first cylindrical holding member having a first hollow portion;
- a second cylindrical holding member having a second hollow portion;
- a diffraction grating provided between the first and second cylindrical holding members;
- a light input device held by the first holding member in the first hollow portion so that the first hollow portion forms an optical path of incident light;
- a diffracted light detection device connected to an end portion of the second holding member opposing to the diffraction grating so that the hollow portion of the second holding member forms an optical path of diffracted light;
- and
- wherein the diffraction grating is fixed so that a light incidence surface of the diffraction grating abuts on an end portion of the first holding member and a light output surface of the diffraction grating abuts on an end portion of the second holding member.
5 more elements
Dependencies are inferred from the claim text.