US4449782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular, optical fiber communication system
Assignee: International Business Machines Corp
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Filing: 1981-04-30
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Granted: 1984-05-22
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Expires: 2001-04-30
Abstract
Abstract Low loss optical couplers for an optical data bus include a first component having permanent input/output connections to the bus and a reference face capable of reflecting energy from the input to the output. If optical energy is to be coupled into or out of the bus, a second component is secured to the first component. The second component has input and/or output optical connections and a reference face which contacts at least part of the reference face of the first component and which permits optical energy to be transferred between the two components. Frequency-selective encoders and decoders using active optical devices are also disclosed.
Inventors
- 👤 Hans-Erdmann Korth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29304; G02B6/29305; G02B6/29307; G02B6/10; G02B6/12; G02B6/12007; G02B6/2804; G02B6/2817; G02B6/2931; G02B6/29311; G02B6/29346; G02B6/29361; G02B6/2937
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
For use in an optical communication system including an optical fiber bus, a self-collimating coupler for selectively coupling energy into or out of the bus, said coupler including: a first component having an optical input from the bus, an optical output to the bus, and a reference fare capable of reflecting input optical energy to the output, said first component being permanently coupled to the bus; a second removable component having an optical output and a reference face, said second component being capable of being retained with at least a portion of its reference face in contact with the reference face of said first component, whereby optical energy applied at the input to said first component is coupled through both reference faces to the output from said second component.
Claim 2
Dependent Claim
129 words
For use in an optical communication system including an optical fiber bus, a self-collimating coupler for selectively coupling energy into or out of the bus, said coupler including: a first component having an optical input from the bus, an optical output to the bus, and a reference fare capable of reflecting input optical energy to the output, said first component being permanently coupled to the bus; a second removable component having an optical output and a reference face, said second component being capable of being retained with at least a portion of its reference face in contact with the reference face of said first component, whereby optical energy applied at the input to said first component is coupled through both reference faces to the output from said second component.
Claim 3
Dependent Claim
29 words
A coupler as recited in claim 1, wherein the optical connections to and the reference face of said first component are symmetrical about a central axis through said component.
Claim 4
Dependent Claim
22 words
A coupler as recited in claim 2 wherein the reference faces of said first component and said second component have complementary configurations.
Claim 5
Dependent Claim
22 words
A coupler as recited in claim 3 wherein each of said components consists of a transparent block having an imaging element therein.
Claim 6
Dependent Claim
42 words
A coupler as recited in claim 4 wherein the reference face of said first component comprises a protruding roof prism having its vertex on the central axis of said component while the reference face of said second component comprises a prism-shaped recess.
Claim 7
Dependent Claim
31 words
A coupler as recited in claim 4 wherein said second component further includes a frequency-selective element for allowing only selected bands of optical energy to be transmitted to its optical output.
Claim 8
Dependent Claim
15 words
A coupler as recited in claim 6 wherein said frequency-selective element comprises an interference filter.
Claim 9
Dependent Claim
45 words
A coupler as recited in claim 1 wherein the reference faces of said first and said second components include a concave spherical mirror while the input and output connections to said first component are eccentric with respect to a central axis through said first component.
References Cited (Backward Citations)
US4198117A
Cited
JPS543554A
Cited
US4289373A
Cited
US4329017A
Cited
US4274706A
Cited
US4274705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |