US5142401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for a linear, wideband sensitive optical receiver
Assignee: Raynet Corp
•
Filing: 1990-06-28
•
Granted: 1992-08-25
•
Expires: 2010-06-28
Abstract
Abstract An optical receiver includes a photodetecting device and a wide band video amplifier. The photodetecting device and the video amplifier are coupled by reactive elements which are selected to provide a highly linear and highly sensitive response over a frequency range of approximately 400-950 MHz. The crosstalk between two signals are ten parts per billion when the laser power is at 1 milliwatt and modulation is 25 percent per signal. The noise generated by the receiver is only equivalent to 6 billionth of an ampere. The receiver uses commerically available components.
Inventors
- 👤 Nelson M. Shen
- 👤 Vinh P. Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:34
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/697; H04B10/6973; H03; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/087; H04B10/691; H04B10/6911
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
An optical receiver for converting optical signals into electrical signals, comprising: a photodetector device having a cathode and an anode and being capable of responding to optical signals so as to generate a time varying electronic current; an amplifier; a voltage source; a radio frequency choke having a first node coupled to the photodetector cathode and a second node coupled to the voltage source; means for coupling the photodetector cathode to an input of the amplifier such that except for current leakage through the radio frequency choke substantially all of the time varying electronic current generated is coupled directly into the amplifier with direct current being blocked.
Claim 2
Dependent Claim
107 words
An optical receiver for converting optical signals into electrical signals, comprising: a photodetector device having a cathode and an anode and being capable of responding to optical signals so as to generate a time varying electronic current; an amplifier; a voltage source; a radio frequency choke having a first node coupled to the photodetector cathode and a second node coupled to the voltage source; means for coupling the photodetector cathode to an input of the amplifier such that except for current leakage through the radio frequency choke substantially all of the time varying electronic current generated is coupled directly into the amplifier with direct current being blocked.
Claim 3
Dependent Claim
24 words
The receiver of claim 1, the coupling means comprising an inductor and capacitor connected in series to the photodetector cathode and the amplifier input.
Claim 4
Dependent Claim
33 words
The receiver of claim 2, the values of the capacitor and the inductor being selected to provide a frequency response of ±1 dB over the frequency range of 400 MHz to 950 MHz.
Claim 5
Dependent Claim
127 words
An optical receiver for recovering a video frequency signal imposed on optical radiation, the optical receiver comprising: a photodetector device; a radio frequency choke; an impedance network having a first terminal coupled to the photodetector device and the radio frequency choke, the impedance network including an inductor and capacitor coupled in series; and a video amplifier, the video amplifier having an input terminal coupled to a second terminal of the impedance network, wherein the impedance network is implemented to provide an impedance match with the video amplifier over a selected frequency range, an output of the photodetector device having no more than two destination locations, one destination location being through the radio frequency choke, the other destination location being through the input terminal to the video amplifier.
Claim 6
Dependent Claim
127 words
An optical receiver for recovering a video frequency signal imposed on optical radiation, the optical receiver comprising: a photodetector device; a radio frequency choke; an impedance network having a first terminal coupled to the photodetector device and the radio frequency choke, the impedance network including an inductor and capacitor coupled in series; and a video amplifier, the video amplifier having an input terminal coupled to a second terminal of the impedance network, wherein the impedance network is implemented to provide an impedance match with the video amplifier over a selected frequency range, an output of the photodetector device having no more than two destination locations, one destination location being through the radio frequency choke, the other destination location being through the input terminal to the video amplifier.
Claim 7
Dependent Claim
16 words
The receiver of claim 1, the preselected frequency range being between 35 MHz and 500 MHz.
Claim 8
Dependent Claim
17 words
The optical receiver of claim 4, wherein the selected frequency range is 400 MHz to 950 MHz.
Claim 9
Dependent Claim
15 words
The optical receiver of claim 4, wherein the photodetector device is as InGaAs PIN detector.
References Cited (Backward Citations)
JPS5434791A
Cited
US4563656A
Cited
US4723313A
Cited
JPS63136836A
Cited
US4856095A
Cited
US4959535A
Cited
US4998012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |