GB2179817A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Electro-optical receiver
Assignee: The General Electric Company PLC
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Filing: 1985-08-28
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Granted: —
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Expires: 2005-08-28
Abstract
Abstract An electro-optical receiver uses a PIN photodiode 1 as a parametric amplifier to convert an incident light signal into a corresponding electrical signal. A locally generated frequency pump signal is applied 3,4 to the diode and part of its energy is transferred to the electrical signal which is representative of the modulation of the incident light. The receiver exhibits very good linearity, and generates very little distortion or noise, but is capable of high sensitivity to low intensity light. <IMAGE>
Inventors
- 👤 Phillip Julian Edwards
- 👤 Ian James Forster
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-22 22:09
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/697; H04B10/6973; H04B10/691; H04B10/6911
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
An electro-optical receiver including a photodetector arranged to receive inciderit light; means for applying a narrow band pump signal to said photo detector to cause parametric amplification of the incident light; a demodulator; and a wideband impedance bluffer having a high input impedance adapted to pass to the demodulator a composite signal comprising the narrow band pump signal and signals representative of amplitude modulation of the incident light which are arranged as upper and lower sidebands with respect to the pump signal.
Claim 2
Dependent Claim
82 words
An electro-optical receiver including a photodetector arranged to receive inciderit light; means for applying a narrow band pump signal to said photo detector to cause parametric amplification of the incident light; a demodulator; and a wideband impedance bluffer having a high input impedance adapted to pass to the demodulator a composite signal comprising the narrow band pump signal and signals representative of amplitude modulation of the incident light which are arranged as upper and lower sidebands with respect to the pump signal.
Claim 3
Dependent Claim
14 words
A receiver as claimed in claim 1 in which the photodetector is a photodiode.
Claim 4
Dependent Claim
24 words
A receiver as claimed in claim 1 or 2 and wherein the impedance buffer is a voltage follower circuit having a high input impedance.
Claim 5
Dependent Claim
18 words
A receiver as claimed in claim 3 and wherein a field effect transistor constitutes the voltage follower circuit.
Claim 6
Dependent Claim
26 words
A receiver as claimed in any of the preceding claims and wherein said narrow band pump signal is applied to said photodetector via a crystal filter.
Claim 7
Dependent Claim
15 words
A receiver as claimed in claim 5 and wherein the demodulator includes a rectifying diode.
Claim 8
Dependent Claim
27 words
A receiver as claimed in any of claims 1 to 4 and wherein the demodulator includes a product detector which utilises the pump signal to achieve demodulation.
Claim 9
Dependent Claim
20 words
An electro-optical receiver substantially as illustrated in and described with reference to Fig. 1 or 2 of the accompanying drawings.
Claim 10
Dependent Claim
20 words
An electro-optical receiver substantially as illustrated in and described with reference to Fig. 1 or 2 of the accompanying drawings.
References Cited (Backward Citations)
US4218776A
Cited
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