Patent US5479547A successfully refreshed from Google Patents.
US5479547A
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Optical multiplexer and demultiplexer module including multiplexing and demultiplexing filter film
Assignee: Fujitsu Ltd
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Filing: 1994-10-13
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Granted: 1995-12-26
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Expires: 2014-10-13
Abstract
Abstract A compact size optical multiplexer and demultiplexer module. The optical multiplexer and demultiplexer module includes a multiplexing and demultiplexing film disposed on an end surface of a waveguide substrate, having an optical waveguide formed thereon, on which surface an input and output end of the optical waveguide appears. The multiplexing and demultiplexing film transmits a light beam of wavelength λ 1 and reflects a light beam of wavelength λ 2 . A first optical fiber is disposed such that a light beam with the wavelength λ 1 propagated therethrough is coupled to the input and output end of the waveguide substrate after being transmitted through the multiplexing and demultiplexing film and the second optical fiber is disposed such that a light beam with the wavelength λ 2 propagated therethrough is coupled to the first optical fiber after being reflected by the multiplexing and demultiplexing film. A light beam with the wavelength λ 1 from the first optical fiber is transmitted through the multiplexing and demultiplexing film and sent to a photodiode and a light beam with the wavelength λ 1 from a laser diode is transmitted through the multiplexing and demultiplexing film and sent to the first optical fiber. A light beam with the wavelength λ 2 from the second optical fiber is reflected by the multiplexing and demultiplexing film and sent to the first optical fiber.
Inventors
- 👤 Tatsuro Kunikane
- 👤 Tetsuo Watanabe
- 👤 Sadayuki Miyata
- 👤 Hiroyuki Furukawa
- 👤 Yoshimitsu Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/12007; G02B6/24; G02B6/42; G02B6/4201; G02B6/4246; G02B2006/12083; G02B2006/12109
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
An optical multiplexer and demultiplexer module comprising: a waveguide substrate on which a waveguide is formed; a multiplexing and demultiplexing filter film provided on an end surface of said waveguide substrate, on which surface an input and output end of said optical waveguide appears, for transmitting a first wavelength and reflecting a second wavelength; a first optical fiber arranged such that a light beam with said first wavelength propagated therethrough is coupled to said optical waveguide on said waveguide substrate after being transmitted through said multiplexing and demultiplexing filter film; and a second optical fiber arranged such that a light beam with said second wavelength propagated therethrough is coupled to said first optical fiber after being reflected by said multiplexing and demultiplexing filter film.
Claim 2
Dependent Claim
124 words
An optical multiplexer and demultiplexer module comprising: a waveguide substrate on which a waveguide is formed; a multiplexing and demultiplexing filter film provided on an end surface of said waveguide substrate, on which surface an input and output end of said optical waveguide appears, for transmitting a first wavelength and reflecting a second wavelength; a first optical fiber arranged such that a light beam with said first wavelength propagated therethrough is coupled to said optical waveguide on said waveguide substrate after being transmitted through said multiplexing and demultiplexing filter film; and a second optical fiber arranged such that a light beam with said second wavelength propagated therethrough is coupled to said first optical fiber after being reflected by said multiplexing and demultiplexing filter film.
Claim 3
Dependent Claim
41 words
An optical multiplexer and demultiplexer module according to claim 1, wherein said first optical fiber and said second optical fiber have their front ends shaped into a spherical form and are arranged slightly apart from said multiplexing and demultiplexing filter film.
Claim 4
Dependent Claim
33 words
An optical multiplexer and demultiplexer module according to claim 1, wherein end faces of said first optical fiber and said second optical fiber are adhesively attached to said multiplexing and demultiplexing filter film.
Claim 5
Dependent Claim
68 words
An optical multiplexer and demultiplexer module according to claim 3, wherein said first optical fiber and said second optical fiber are obliquely cut in the vicinity of their front end faces such that said front end faces are partly left uncut and said obliquely cut faces are joined together, whereby front ends of the cores of said first optical fiber and said second optical fiber are joined together.
Claim 6
Dependent Claim
112 words
An optical multiplexer and demultiplexer module according to claim 1, wherein the end surface, on which said multiplexing and demultiplexing filter film is formed, of said waveguide substrate is oriented such that the normal line to said end surface forms an angle of θ 0 with said optical waveguide, said first optical fiber and said second optical fiber are arranged on both sides of the normal line to said end surface, each forming an angle of θ 1 with the normal line, and said angle θ 0 and said angle θ 1 are set so as to substantially satisfy the relationship sinθ1=n.sinθ.sub.0, where n is the refractive index of said optical waveguide.
Claim 7
Dependent Claim
41 words
An optical multiplexer and demultiplexer module according to claim 1, wherein said first optical fiber is coupled to said optical waveguide through a first lens, and said second optical fiber is coupled to said first optical fiber through a second lens.
Claim 8
Dependent Claim
67 words
An optical multiplexer and demultiplexer module according to claim 6, wherein said first optical fiber and the center axis of said first lens are arranged to be out of alignment, and said second optical fiber and the center axis of said second lens are arranged to be out of alignment, whereby said first optical fiber and said second optical fiber are arranged substantially parallel to each other.
Claim 9
Dependent Claim
113 words
An optical multiplexer and demultiplexer module according to claim 5, further comprising: a first substrate in which a pair of V grooves are formed, said V grooves forming the same angle therebetween as the angle to be formed between said first optical fiber and said second optical fiber; and a second substrate on which said first substrate and said waveguide substrate are to be fixed, wherein said first optical fiber and said second optical fiber are disposed along their respective V grooves and then fixed to said first substrate, and said first substrate and said waveguide substrate are disposed so as to satisfy said predetermined relationship and then fixed to said second substrate.
Claim 10
Dependent Claim
67 words
An optical multiplexer and demultiplexer module according to claim 8, wherein the surfaces around the front end portions of said first optical fiber and said second optical fiber and the surfaces of said V grooves are coated with metallic plating, and said first optical fiber and said second optical fiber are fixed at their metal-plated portions to said V grooves formed in said first substrate by soldering.
Claim 11
Dependent Claim
26 words
An optical multiplexer and demultiplexer module according to claim 8, wherein said first substrate and said waveguide substrate are fixed to said second substrate by soldering.
Claim 12
Dependent Claim
183 words
An optical multiplexer and demultiplexer module comprising: a waveguide substrate, on which an optical waveguide is formed, having a slit formed therein such that the input and output end of said optical waveguide appears on a surface of said slit and having a first V groove and a second V groove formed therein so as to form predetermined angles with said slit; a multiplexing and demultiplexing filter film provided on the surface of said slit formed in said waveguide substrate, on which surface said optical waveguide appears, for transmitting a first wavelength and reflecting a second wavelength; a first optical fiber arranged along and fixed to said first V groove such that a light beam with said first wavelength propagated therethrough is coupled to said optical waveguide on said waveguide substrate after being transmitted through said multiplexing and demultiplexing filter film; and a second optical fiber arranged along and fixed to said second V groove such that a light beam with said second wavelength propagated therethrough is coupled to said first optical fiber after being reflected by said multiplexing and demultiplexing filter film.
Claim 13
Dependent Claim
183 words
An optical multiplexer and demultiplexer module comprising: a waveguide substrate, on which an optical waveguide is formed, having a slit formed therein such that the input and output end of said optical waveguide appears on a surface of said slit and having a first V groove and a second V groove formed therein so as to form predetermined angles with said slit; a multiplexing and demultiplexing filter film provided on the surface of said slit formed in said waveguide substrate, on which surface said optical waveguide appears, for transmitting a first wavelength and reflecting a second wavelength; a first optical fiber arranged along and fixed to said first V groove such that a light beam with said first wavelength propagated therethrough is coupled to said optical waveguide on said waveguide substrate after being transmitted through said multiplexing and demultiplexing filter film; and a second optical fiber arranged along and fixed to said second V groove such that a light beam with said second wavelength propagated therethrough is coupled to said first optical fiber after being reflected by said multiplexing and demultiplexing filter film.
Claim 14
Dependent Claim
94 words
an optical multiplexer and demultiplexer module according to claim 11, wherein said slit is formed such that the normal line thereof forms an angle of θ 0 with said optical waveguide, said first V groove and said second V groove are arranged on both sides of the normal line to said slit, each forming an angle of θ 1 with the normal line, and said angle θ 0 and said angle θ 1 are set so as to substantially satisfy the relationship sinθ.sub.1 =n.sinθ.sub.0, where n is the refractive index of said optical waveguide.
Claim 15
Dependent Claim
82 words
An optical multiplexer and demultiplexer module according to claim 11, wherein the surfaces around the front end portions of said first optical fiber and said second optical fiber and the surfaces of said first V groove and said second V groove are coated by metallic plating, and said first optical fiber and said second optical fiber are arranged along said first V groove and said second V groove and are fixed at their metal plated portions to said waveguide substrate by soldering.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |