Patent US5563731A successfully refreshed from Google Patents.
US5563731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitor control signal receiving apparatus for optical fiber amplifier
Assignee: NEC Corp
•
Filing: 1995-02-22
•
Granted: 1996-10-08
•
Expires: 2015-02-22
Abstract
Abstract A monitor control signal receiving apparatus for an optical fiber amplifier includes a laser diode, an optical coupler, a rare-earth-element-doped optical fiber, a pin photodiode, a controller, and a monitor signal extractor. The laser diode generates pump light. The optical coupler optically wavelength-multiplexes an input optical signal and the pump light from the laser diode. The rare-earth-element-doped optical fiber receives the optical signal and pump light from the optical coupler. The pin photodiode converts part of an optically amplified optical signal from the rare-earth-element-doped optical fiber into an electrical signal. The controller compares the electrical signal from the photoelectric converter with a reference voltage to control the laser diode such that an output level of the optical signal from the optical fiber is kept constant. The monitor signal extractor extracts a monitor control signal from an output from the controller.
Inventors
- 👤 Koji Asahi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:51
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06754; H01S3/10; H01S3/13; H01S3/1301; H01S3/13013; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/06832
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A monitor control signal receiving apparatus for an optical fiber amplifier, comprising: pump light generating means for generating pump light; optical coupler means for optically wavelength-multiplexing an input optical signal and the pump light from said pump light generating means; a rare-earth-element-doped optical fiber for receiving the optical signal and pump light from said optical coupler means; photoelectric converting means for converting part of an optically amplified optical signal from said rare-earth-element-doped optical fiber into an electrical signal; control means for comparing the electrical signal from said photoelectric converting means with a reference voltage to control said pump light generating means such that an output level of the optical signal from said optical fiber is kept constant; and monitor signal extracting means for extracting a monitor control signal from an output from said control means.
Claim 2
Dependent Claim
135 words
A monitor control signal receiving apparatus for an optical fiber amplifier, comprising: pump light generating means for generating pump light; optical coupler means for optically wavelength-multiplexing an input optical signal and the pump light from said pump light generating means; a rare-earth-element-doped optical fiber for receiving the optical signal and pump light from said optical coupler means; photoelectric converting means for converting part of an optically amplified optical signal from said rare-earth-element-doped optical fiber into an electrical signal; control means for comparing the electrical signal from said photoelectric converting means with a reference voltage to control said pump light generating means such that an output level of the optical signal from said optical fiber is kept constant; and monitor signal extracting means for extracting a monitor control signal from an output from said control means.
Claim 3
Dependent Claim
65 words
An apparatus according to claim 1, wherein said control means comprises current/voltage converting means for converting a current signal representing an electrical signal from said photoelectric converting means into a voltage signal and comparing means for comparing the voltage signal from said current/voltage converting means with said reference voltage, and said pump light generating means is controlled based on an output from said comparing means.
Claim 4
Dependent Claim
41 words
An apparatus according to claim 1, further comprising filter means for removing a noise component included in an output from said control means, and driving means for driving said pump light generating means based on an output from said filter means.
Claim 5
Dependent Claim
16 words
An apparatus according to claim 1, wherein said rare-earth-element-doped optical fiber comprises an Er-doped optical fiber.
Claim 6
Dependent Claim
16 words
An apparatus according to claim 1, wherein said pump light generating means comprises a laser diode.
Claim 7
Dependent Claim
15 words
An apparatus according to claim 1, wherein said photoelectric converting means comprises a pin photodiode.
References Cited (Backward Citations)
US4995100A
Cited
JPH02119328A
Cited
US5054876A
Cited
JPH0387727A
Cited
US5138621A
Cited
US5355250A
Cited
JPH06338874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-08 | 2000-04-08 | 2000-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-08 | 2004-04-08 | 2004-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-08 | 2008-04-08 | 2008-10-08 | $7700.00 | Window Closed / Lapsed |