EP0183502A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements relating to optical pulse generating arrangements
Assignee: Roke Manor Research Ltd
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Filing: 1985-11-25
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Granted: —
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Expires: 2005-11-25
Abstract
Abstract A differential delay optical coherent pulse generating arrangement, in which continuous wave light derived from a coherent light source is divided by beam splitting means into two optical paths, in which the light beam in one of the said paths is delayed relative to the light beam in the other of said paths by differential delay means prior to the sequential selection of the light from the respective paths by optical switching means to produce two coherent pulses in predetermined time displaced relationship and in which a frequency difference may, if required, be produced between the frequencies of the two coherent pulses.
Inventors
- 👤 Christopher Anthony Wade
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:55
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/005; H01S3/0057; G; G02; G02F; G02F1/00; G02F1/01; G02F1/21; G02F2/00; G02F2/002; G02F1/212; G02F1/225; G02F1/2252; G02F2203/00; G02F2203/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A differential delay optical coherent pulse generating arrangement, in which continuous wave light derived from a coherent light source is divided by beam splitting means into two optical paths, in which the light beam in one of said paths is delayed relative to the light beam in the other of said paths by differential delay means prior to the sequential selection of the light from the respective paths by optical switching means to produce two coherent pulses in predetermined time displaced relationship and in which a frequency difference may, if required, be produced between the frequencies of the two coherent pulses.
Claim 2
Dependent Claim
101 words
A differential delay optical coherent pulse generating arrangement, in which continuous wave light derived from a coherent light source is divided by beam splitting means into two optical paths, in which the light beam in one of said paths is delayed relative to the light beam in the other of said paths by differential delay means prior to the sequential selection of the light from the respective paths by optical switching means to produce two coherent pulses in predetermined time displaced relationship and in which a frequency difference may, if required, be produced between the frequencies of the two coherent pulses.
Claim 3
Dependent Claim
76 words
A differential delay optical coherent pulse generating arrangement as claimed in claim 1, in which the frequency difference between the two output pulses is produced by a frequency shifting device introduced into either of the two optical paths, or into the arrangement following the optical switching means in which case the frequency shifting device will be arranged to shift the frequencies of both time displaced pulses relative to one another to produce the requisite frequency differential.
Claim 4
Dependent Claim
21 words
A differential delay optical coherent pulse generating arrangement as claimed in claim 1, in which the optical paths are optical fibres.
Claim 5
Dependent Claim
83 words
A differential delay optical coherent pulse generating arrangement as claimed in claim 1, in which the optical switching means and the generation of a frequency difference between the two coherent pulses is provided by a Bragg cell which receives the light beams from the respective optical paths and which is driven by two different signals so that the two light beams are alternatively deflected into a common output optical fibre as the Bragg cell is driven in turn by the two different frequencies.
Claim 6
Dependent Claim
70 words
A differential delay optical coherent pulse generating arrangement, in which the output from a continuous wave coherent light source is fed to a frequency shifting Bragg cell which is driven alternately by two different frequency signals to produce output pulses of different frequency for launching into an output optical fibre and which additionally serves to switch partially reflected optical pulses returned over said output optical fibre to light detecting means.
Claim 7
Dependent Claim
70 words
A differential delay optical coherent pulse generating arrangement, in which the output from a continuous wave coherent light source is fed to a frequency shifting Bragg cell which is driven alternately by two different frequency signals to produce output pulses of different frequency for launching into an output optical fibre and which additionally serves to switch partially reflected optical pulses returned over said output optical fibre to light detecting means.
References Cited (Backward Citations)
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