Patent US2316506A successfully refreshed from Google Patents.
US4474424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical multi/demultiplexer using interference filters
Assignee: Nokia Bell Labs
•
Filing: 1981-03-20
•
Granted: 1984-10-02
•
Expires: 2001-03-20
Abstract
Abstract The disclosed multiplexer/demultiplexer (10, 40) features input and output optical fibers (20, 22, 24, 42, 44, 46, 48, 50) coupled to one face (16) of a graded refractive index rod collimating lens (12). Associated with the other face (18) of the lens (12) are a plurality of multi-layer dielectric interference filters (26, 32, 52, 54, 56, 58) which selectively reflect the input signals at different angles according to the wavelength and thereby direct them back through the lens (12) to the appropriate output fiber.
Inventors
- 👤 Richard E. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:07
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29346; G02B6/29361; G02B6/2937; G02B6/29379; G02B6/2938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A device comprising: a graded refractive index optical lens having first and second faces and an optical axis; a multiplexed signal optical transmission fiber optically coupled to the center of the first face of said lens; a plurality of individual signal optical transmission fibers optically coupled to the first face of said lens in a configuration about said multiplexed signal fiber; a plurality of multilayer dielectric reflective interference filters spaced progressively from the second face of said lens and each fixed in a position tilted with respect to the second face at equal angles and in different directions corresponding to the configuration of said individual signal fibers, each of said filters being capable of transmitting signals of a wavelength which is reflected by others of said filters, and transparent wedges between each of said filters and its adjacent optical element fixing the relative spacing and orientation.
Claim 2
Independent Claim
146 words
A device comprising: a graded refractive index optical lens having first and second faces and an optical axis; a multiplexed signal optical transmission fiber optically coupled to the center of the first face of said lens; a plurality of individual signal optical transmission fibers optically coupled to the first face of said lens in a configuration about said multiplexed signal fiber; a plurality of multilayer dielectric reflective interference filters spaced progressively from the second face of said lens and each fixed in a position tilted with respect to the second face at equal angles and in different directions corresponding to the configuration of said individual signal fibers, each of said filters being capable of transmitting signals of a wavelength which is reflected by others of said filters, and transparent wedges between each of said filters and its adjacent optical element fixing the relative spacing and orientation.
References Cited (Backward Citations)
SU382041A1
Cited
US4111524A
Cited
JPS54114251A
Cited
US4300811A
Cited
JPS5535346A
Cited
US4208094A
Cited
JPS55121403A
Cited
US4341438A
Cited
US4243297A
Cited
JPS5617305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |