EP0402295A1
Expired / Lapsed
EP
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Method and system for transmitting signals over a fibre optic link
Assignee: International Business Machines Corp
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Filing: 1990-04-20
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Granted: —
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Expires: 2010-04-20
Abstract
Abstract System for transmitting signals over a fiber optic link (12) between a transmitter (10) converting an electrical signal into a light signal and a receiver (14) converting the received light signal into an electrical signal. The tramsitter (10) includes a circuit arrangement which generates a data stream of analog signals interspersed with control pulses. This data stream is then transmitted through the fiber optic link (12), and changes in the control pulses are detected at the receiver (14) and are used to adjust the gain of a video amplifier (62).
Inventors
- 👤 David Eugene Conner
- 👤 Alexander Garland Mac Innis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 09:09
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/691; H04B10/50; H04B10/501; H04B10/502
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
A method for transmitting analog video information over a fiber optic link (12) between a transmitter (10) and a receiver (14), characterized in that it comprises steps of : at said transmitter, (a) generating a first stream of electrical signals representative of the video information to be displayed, said stream including time intervals (blanking period), when no video information is present in said signals, (b) generating Reference White Pulses, (c) during each blanking period, inserting a Reference White Pulse into said first stream to form a second stream of electrical signals having alternate analog and pulse electrical signals, and (d) modulating a light source, to output light signals representative of said second stream of electrical signals; at said receiver, (e) receiving the light signals, (f) determining amplitude changes occurring in the Reference White Pulses, and (g) using the changes for adjusting the gain of said receiver.
Claim 2
Independent Claim
146 words
A method for transmitting analog video information over a fiber optic link (12) between a transmitter (10) and a receiver (14), characterized in that it comprises steps of : at said transmitter, (a) generating a first stream of electrical signals representative of the video information to be displayed, said stream including time intervals (blanking period), when no video information is present in said signals, (b) generating Reference White Pulses, (c) during each blanking period, inserting a Reference White Pulse into said first stream to form a second stream of electrical signals having alternate analog and pulse electrical signals, and (d) modulating a light source, to output light signals representative of said second stream of electrical signals; at said receiver, (e) receiving the light signals, (f) determining amplitude changes occurring in the Reference White Pulses, and (g) using the changes for adjusting the gain of said receiver.
Claim 3
Dependent Claim
74 words
The method according to claim 1 wherein the determining step (f) further includes the steps of: (h) generating a third stream of electrical signals from said light signals, (i) establishing a reference voltage level for the White Pulse, (j) establishing a blanking period, and (k) during said blanking period, comparing received reference white pulses with the referenced voltage level to generate an error signal representative of the amplitude changes within said Reference White Pulses.
Claim 4
Dependent Claim
166 words
System for transmitting signals over a fiber optic link having a transmitter (10) for converting an electrical signal into a light signal, a fiber optic link (12) for transmitting said light signal and a receiver (14) for converting said light into an electrical signal, said system being characterized in that it comprises : first means, provided at said transmitter, for generating a stream of electrical signal characterized by alternate information periods and non-information periods, second means (24, 26, 28), provided at said transmitter, responsive to a control signal for generating and inserting in said stream of electrical signals control pulses during the non-information period, third means (58), at said receiver, for processing said control pulses and generating therefrom, error signals representative of amplitude changes occurring in said control pulses, fourth means responsive to the error signals for adjusting the amplitude of received signals to compensate for the changes that occurred in said control pulses, and fifth means for deleting the control pulses from the received signals.
Claim 5
Dependent Claim
166 words
System for transmitting signals over a fiber optic link having a transmitter (10) for converting an electrical signal into a light signal, a fiber optic link (12) for transmitting said light signal and a receiver (14) for converting said light into an electrical signal, said system being characterized in that it comprises : first means, provided at said transmitter, for generating a stream of electrical signal characterized by alternate information periods and non-information periods, second means (24, 26, 28), provided at said transmitter, responsive to a control signal for generating and inserting in said stream of electrical signals control pulses during the non-information period, third means (58), at said receiver, for processing said control pulses and generating therefrom, error signals representative of amplitude changes occurring in said control pulses, fourth means responsive to the error signals for adjusting the amplitude of received signals to compensate for the changes that occurred in said control pulses, and fifth means for deleting the control pulses from the received signals.
Claim 6
Dependent Claim
42 words
The system according to claim 3 wherein said second means includes an FET device (34), a voltage supply, a resistive means (R1) interconnecting the voltage supply and the FET, and a pulse generator means (36) coupled to control electrode of said FET.
Claim 7
Dependent Claim
100 words
The system according to claim 3 wherein said second means includes a current source (42), a voltage supply (+V) coupled to said current source, a switching means (38) interconnecting said current source and a reference voltage and comprising a first (T4) and a second transistors (T5) connected in a parallel configuration with the emitter electrodes of said transistors connected to a common node, the collector electrode of one said first transistor being connected to ground potential, and the control electrode of said second transistor being connected to said reference voltage, and a pulse generator (40) connected to said switching means.
Claim 8
Independent Claim
40 words
The system according to claims 3, 4 or 5 wherein said third means (58) includes a peak detecting means (64) for detecting the control pulses, and a comparator means (66) for comparing the control pulses with a predetermined reference pulse.
Claim 9
Dependent Claim
63 words
The system according to claim 6 wherein said detecting means (64) further includes a voltage supply, a first transistor having a collector electrode coupled to said voltage supply, a second transistor having an emitter electrode coupled to the base electrode of said first transistor and the voltage supply, and a storage means interconnecting the emitter of said first transistor to a ground potential.
Claim 10
Independent Claim
43 words
The system according to claims 6 or 7 wherein said comparator means (66) includes an operational amplifier, a voltage divider means connected to an input of said operational amplifier, and a resistive means coupling another input of said amplifier to a ground potential.
Claim 11
Independent Claim
28 words
The system according to any one of claims 3 to 8 wherein said fourth means includes an amplifying means, and an FET device coupled to said amplifying means.
Claim 12
Independent Claim
19 words
The system according to any one of claims 3 to 9 wherein said fifth means includes an electronic switch.
References Cited (Backward Citations)
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