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GB2225505A Expired / Lapsed GB ⏱️ 0.0 years remaining

Low noise optoelectronic correlators and mixers

Assignee: Individual
•
Filing: 1988-07-07
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Granted: —
•
Expires: 2008-07-07
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Abstract

Abstract In this invention photo-conductive elements onto which an optical signal with modulation is incident are used to detect and correlate the optical modulation with an electrical r.f. signal all within the same device. This can be used to detect and correlate optical signals which are modulated with pseudo-random codes or spread spectrum codes with reference electrical signals. This can be used in PRBS optical time domain reflectometry for distributed sensor application by launching a PRBS-modulated laser (2) into an optical fibre (12) and correlating at (4) the back-scattered radiation with a delayed version (6) of the original sequence. The device (4) itself consists of a coplanar transmission lie with a gap. <IMAGE>

Inventors

  • 👤 Jeremy Kenneth Arthur Everard

Bibliographic Details

Application Number —
Jurisdiction GB
Data Source google_patents
Last Synchronized 2026-10-22 22:06
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; G; G01; G01M; G01M11/00; G01M11/30; G01M11/31; G01M11/3109; G01M11/3118; G02; G02F; G02F2/00; G02F2/002; H10; H10F; H10F30/00; H10F30/10

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 63 words
LOW.NOISE OPTO-ELECTRONIC CORRELATORS AND MIXERS CLAIMS 1. A photo-conductive detector comprising a semiconductor with two metal electrodes where the semiconductor is illuminated with a modulated optical signal or many optical signals where one electrode has an input rf signal applied to it where the output from the other electrode is the mixed or correlated or downconverted signal of the optical and electrical signal.
Claim 2
Dependent Claim 51 words
The input rf signal described in claim 1 is a signal modulated with a pseudo-random code to obtain spatial information about the optical signal by correlating the RF signal with the optical signal which can be from an optical fibre where the output from the other electrode is the correlated signal.
Claim 3
Dependent Claim 21 words
The photo-conductor described in claim 1 is a coplanar transmission line with a gap in the middle of the transmission line.
Claim 4
Dependent Claim 22 words
The photo-conductor described in claim 1 is a coplanar transmission line which is illuminated between the centre conductor and the ground plane.
Claim 5
Dependent Claim 18 words
The photo-conductor described in claim 1 is a microstrip transmission line with a gap in the centre line
Claim 6
Dependent Claim 39 words
The photoconductor shown in Figures 1 to 4 is used in the system shown in Figure 6 to perform the detection and correlation of the optical signal and the electrical signal to obtain spatial information about the optical signal.

References Cited (Backward Citations)

US3491241A Cited
GB1482954A Cited

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