US5020153A
Expired / Lapsed
US
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Tunable narrowband receiver utilizing distributed Bragg reflector laser structure
Assignee: Nokia Bell Labs
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Filing: 1989-02-08
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Granted: 1991-05-28
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Expires: 2009-02-08
Abstract
Abstract A lightwave communication system is disclosed in which an integrated receiver is realized as a distributed Bragg reflector (MQW-DBR) laser structure biased at or below threshold. The receiver functions simultaneously as a tunable filter, optical amplifier, photodetector, and, if desired, as an FSK discriminator. It is also disclosed that the lightwave receiver also is capable of half duplex operation as a lightwave transmitter using the same DBR laser structure. The disclosed receiver eliminates complex coupling of the many different element realized by the integrated, multifunction structure.
Inventors
- 👤 Fow-Sen Choa
- 👤 Thomas L. Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:17
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/40; H04B10/43; H01; H01S; H01S5/00; H01S5/0014; H01S5/0028; H01S5/06; H01S5/062; H01S5/0625; H01S5/06255; H01S5/06256
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A method for receiving lightwave signals comprising the steps of: electrically biasing a distributed Bragg reflector semiconductor laser to a predetermined value for optical amplification in a range below 1.25 of a lasing threshold, I th , directing said lightwave signals to impinge on said distributed Bragg reflector laser, deriving an electrical signal representing said lightwave signals impinging on said distributed Bragg reflector laser by amplifying said lightwave signals, by filtering said lightwave signals, and by translating changes in at least carrier density in a gain region of said distributed Bragg reflector laser into said electrical signal, said changes being caused by said lightwave signals impinging on said distributed Bragg reflector laser.
Claim 2
Independent Claim
112 words
A method for receiving lightwave signals comprising the steps of: electrically biasing a distributed Bragg reflector semiconductor laser to a predetermined value for optical amplification in a range below 1.25 of a lasing threshold, I th , directing said lightwave signals to impinge on said distributed Bragg reflector laser, deriving an electrical signal representing said lightwave signals impinging on said distributed Bragg reflector laser by amplifying said lightwave signals, by filtering said lightwave signals, and by translating changes in at least carrier density in a gain region of said distributed Bragg reflector laser into said electrical signal, said changes being caused by said lightwave signals impinging on said distributed Bragg reflector laser.
Claim 3
Dependent Claim
31 words
The method defined in claim 1 wherein the step of biasing further includes biasing said distributed Bragg reflector laser to said predetermined value slightly below a lasing threshold, I th .
Claim 4
Dependent Claim
45 words
The method defined in claim 2 wherein the distributed Bragg reflector laser comprises a gain section and a Bragg section optically coupled together and wherein the step of deriving the electrical signal further includes tuning to a predetermined wavelength by electrically biasing said Bragg section.
Claim 5
Dependent Claim
45 words
The method defined in claim 1 wherein the distributed Bragg reflector laser comprises a gain section and a Bragg section optically coupled together and wherein the step of deriving the electrical signal further includes tuning to a predetermined wavelength by electrically biasing said Bragg section.
Claim 6
Independent Claim
162 words
A method for receiving FSK modulated lightwave signals comprising the steps of: electrically biasing a distributed Bragg reflector semiconductor laser to a predetermined value for optical amplification in a range below 1.25 of a lasing threshold, I th , said distributed Bragg reflector laser comprises a gain section and a Bragg section optically coupled together, tuning said Bragg section to a predetermined wavelength by electrically biasing said Bragg section, said predetermined wavelength selected to be between first and second wavelengths associated with said FSK modulated lightwave signals, directing said lightwave signals to impinge on said distributed Bragg reflector laser, deriving an electrical signal representing said lightwave signals impinging on said distributed Bragg reflector laser by amplifying said lightwave signals, by filtering said lightwave signals, and by translating changes in at least carrier density in a gain region of said distributed Bragg reflector laser into said electrical signal, said changes being caused by said lightwave signals impinging on said distributed Bragg reflector laser.
Claim 7
Independent Claim
162 words
A method for receiving FSK modulated lightwave signals comprising the steps of: electrically biasing a distributed Bragg reflector semiconductor laser to a predetermined value for optical amplification in a range below 1.25 of a lasing threshold, I th , said distributed Bragg reflector laser comprises a gain section and a Bragg section optically coupled together, tuning said Bragg section to a predetermined wavelength by electrically biasing said Bragg section, said predetermined wavelength selected to be between first and second wavelengths associated with said FSK modulated lightwave signals, directing said lightwave signals to impinge on said distributed Bragg reflector laser, deriving an electrical signal representing said lightwave signals impinging on said distributed Bragg reflector laser by amplifying said lightwave signals, by filtering said lightwave signals, and by translating changes in at least carrier density in a gain region of said distributed Bragg reflector laser into said electrical signal, said changes being caused by said lightwave signals impinging on said distributed Bragg reflector laser.
Claim 8
Dependent Claim
33 words
The method defined in claim 5 wherein the step of tuning includes tuning to said predetermined wavelength is substantially closer to said first wavelength, said first wavelength being longer than said second wavelength.
Claim 9
Independent Claim
169 words
A method for communicating via lightwave signals by sending and receiving said lightwave signals using a transceiver, said transceiver including a distributed Bragg reflector semiconductor laser, said method comprising the steps of: generating said lightwave signals for transmission by the steps of: electrically biasing said distributed Bragg reflector semiconductor laser to a predetermined value greater than a lasing threshold, I th ; receiving said lightwave signals by the steps of: electrically biasing said distributed Bragg reflector semiconductor laser to a predetermined value for optical amplification in a range below 1.25 of said lasing threshold; directing said lightwave signals to impinge on said distributed Bragg reflector laser; deriving an electrical signal representing said lightwave signals impinging on said distributed Bragg reflector laser by amplifying said lightwave signals, by filtering said lightwave signals, and by translating changes in at least carrier density in a gain region of said distributed Bragg reflector laser into said electrical signal, said changes being caused by said lightwave signals impinging on said distributed Bragg reflector laser.
Claim 10
Independent Claim
169 words
A method for communicating via lightwave signals by sending and receiving said lightwave signals using a transceiver, said transceiver including a distributed Bragg reflector semiconductor laser, said method comprising the steps of: generating said lightwave signals for transmission by the steps of: electrically biasing said distributed Bragg reflector semiconductor laser to a predetermined value greater than a lasing threshold, I th ; receiving said lightwave signals by the steps of: electrically biasing said distributed Bragg reflector semiconductor laser to a predetermined value for optical amplification in a range below 1.25 of said lasing threshold; directing said lightwave signals to impinge on said distributed Bragg reflector laser; deriving an electrical signal representing said lightwave signals impinging on said distributed Bragg reflector laser by amplifying said lightwave signals, by filtering said lightwave signals, and by translating changes in at least carrier density in a gain region of said distributed Bragg reflector laser into said electrical signal, said changes being caused by said lightwave signals impinging on said distributed Bragg reflector laser.
Claim 11
Dependent Claim
70 words
A lightwave communication system comprising a transmitter of lightwave signals, a receiver for receiving said lightwave signals, and a transmission medium for optically coupling said transmitter to said receiver, said receiver comprising a distributed Bragg reflector laser structure responsive to said lightwave signals and to an electrical bias substantially less than a threshold of lasing for said distributed Bragg reflector laser structure for amplifying, filtering and detecting said lightwave signals.
Claim 12
Dependent Claim
70 words
A lightwave communication system comprising a transmitter of lightwave signals, a receiver for receiving said lightwave signals, and a transmission medium for optically coupling said transmitter to said receiver, said receiver comprising a distributed Bragg reflector laser structure responsive to said lightwave signals and to an electrical bias substantially less than a threshold of lasing for said distributed Bragg reflector laser structure for amplifying, filtering and detecting said lightwave signals.
References Cited (Backward Citations)
USRE31969E
Cited
US4719636A
Cited
US4852108A
Cited
US4873691A
Cited
US4908833A
Cited
US4972514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |