US4564946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical communications system using frequency shift keying
Assignee: Nokia Bell Labs
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Filing: 1983-02-25
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Granted: 1986-01-14
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Expires: 2003-02-25
Abstract
Abstract Frequency shift keying optical communications devices using a cleaved coupled cavity laser are described. The cleaved coupled cavity laser comprises first and second laser diode sections which are mutually optically coupled to each other and means for adjusting the refractive index of the first and second sections relative to each other. The cleaved coupled cavity laser is part of a light source which further comprises means for selecting at least one desired output frequency from a group of at least two output frequencies.
Inventors
- 👤 Nils A. Olsson
- 👤 Won-Tien Tsang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:28
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/082; H01S3/0823; H01S3/0826; H01S5/00; H01S5/10; H01S5/1021; H01S5/14; H01S5/02; H01S5/026; H01S5/40; H01S5/4025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A device comprising a light source, characterized in that said light source comprises a cleaved coupled cavity laser, said laser comprising a first semiconductor laser diode section, said first section having a first active layer; a second semiconductor laser diode section, said second section having a second active layer, said first and second active layers having a width less than approximately 20 μm; said first and second sections being optically coupled in both directions through spaced cleaved surfaces; means for adjusting the refractive index of said first and second sections relative to each other; and means for selecting one desired output frequency from a group of at least two output frequencies.
Claim 2
Independent Claim
111 words
A device comprising a light source, characterized in that said light source comprises a cleaved coupled cavity laser, said laser comprising a first semiconductor laser diode section, said first section having a first active layer; a second semiconductor laser diode section, said second section having a second active layer, said first and second active layers having a width less than approximately 20 μm; said first and second sections being optically coupled in both directions through spaced cleaved surfaces; means for adjusting the refractive index of said first and second sections relative to each other; and means for selecting one desired output frequency from a group of at least two output frequencies.
Claim 3
Dependent Claim
29 words
A device as recited in claim 1 in which said means for selecting comprises means for adjusting the current through said second section of said cleaved coupled cavity laser.
Claim 4
Dependent Claim
26 words
A device as recited in claim 2 further comprising a wavelength dispersive photodetector module, said photodetector module being optically connected to said cleaved coupled cavity laser.
Claim 5
Dependent Claim
25 words
A device as recited in claim 3 in which said photodetector module comprises a wavelength dispersive element and at least one photodetector generating current pulses.
Claim 6
Dependent Claim
32 words
A device as recited in claim 4 further comprising means for regenerating current pulses from said at least one photodetector, said means for regenerating being connected to said module and said laser.
Claim 7
Dependent Claim
16 words
A device as recited in claim 5 in which said module comprises a plurality of photodetectors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |