GB1387981A - Optical communication system - Google Patents

Optical communication system

Info

Publication number
GB1387981A
GB1387981A GB3445573A GB3445573A GB1387981A GB 1387981 A GB1387981 A GB 1387981A GB 3445573 A GB3445573 A GB 3445573A GB 3445573 A GB3445573 A GB 3445573A GB 1387981 A GB1387981 A GB 1387981A
Authority
GB
United Kingdom
Prior art keywords
output
detector
propogation
detectors
compensate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3445573A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3445573A priority Critical patent/GB1387981A/en
Publication of GB1387981A publication Critical patent/GB1387981A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/29392—Controlling dispersion
    • G02B6/29394—Compensating wavelength dispersion
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

1387981 Optical communications systems STANDARD TELEPHONES & CABLES Ltd 19 July 1973 34455/73 Heading G1A In an optical communications system components of the output from a length of optical fibre are separately detected and the resulting signals combined after passing through suitable delays to compensate for different propogation times of the components. In a first embodiment, Fig. I, the output of a multimode optical fibre 14 is directed on to an I.C. photo-detector comprising a central detector area 11 surrounded by an annular detector area 12. The output of detector 11 is delayed before it is combined with the output of detector 12 to compensate for the dispersion of pulses due to the increase in propogation time with increase in angle of propogation. The amount of the delay depends on the properties of the fibre and its length. Further annular photo-detectors may be used with suitably proportioned delays. In a second embodiment Fig. 2 (not shown) a single mode fibre is compensated for spectral dispersion by passing the output through a collimating lens (21) to a prism (22), a second lens (23) focusing the spectrum on to a linear array of three photo-detectors (24, 25, 26). The outputs of two of the detectors are delayed by different amounts before being combined with the output of the third detector to compensate for differences in propogation speed with wavelength.
GB3445573A 1973-07-19 1973-07-19 Optical communication system Expired GB1387981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3445573A GB1387981A (en) 1973-07-19 1973-07-19 Optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3445573A GB1387981A (en) 1973-07-19 1973-07-19 Optical communication system

Publications (1)

Publication Number Publication Date
GB1387981A true GB1387981A (en) 1975-03-19

Family

ID=10365863

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3445573A Expired GB1387981A (en) 1973-07-19 1973-07-19 Optical communication system

Country Status (1)

Country Link
GB (1) GB1387981A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2317826A1 (en) * 1975-06-26 1977-02-04 Northern Telecom Ltd Chromatic pulse dispersion correction - with pulsed beam split into spectral sectors and separate output signals derived and combined(NL281276)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2317826A1 (en) * 1975-06-26 1977-02-04 Northern Telecom Ltd Chromatic pulse dispersion correction - with pulsed beam split into spectral sectors and separate output signals derived and combined(NL281276)

Similar Documents

Publication Publication Date Title
JPS57123497A (en) Measuring apparatus utilizing optical fiber
SU500771A3 (en) Single Beam Spectrophotometer
EP0171888A3 (en) Anamorphic prism for beam shaping
GB1267632A (en) A microphone for direct conversion of sound signals into pulse-coded electric signals
GB1126189A (en) Binoculars for communication systems
GB1226275A (en)
GB1276746A (en) Photoelectric converter
GB1497995A (en) Fibre optic acoustic monitoring arrangement
EP0280329A3 (en) Chromatic dispersion measuring system for optical fibers
GB1302068A (en)
GB1386007A (en) Optical distance measuring methods and apparatus
GB1387981A (en) Optical communication system
US3821549A (en) Semiconductor drift photodetector for equalization of optical fiber material dispersion
CN205157847U (en) Luminous power photoelectric detector that area keeps apart
GB1399953A (en) Optical apparatus comprising an optical fibre bundle
GB1260901A (en) A device for measuring the duration of short light pulses, such as laser pulses
SU981833A1 (en) 1:2 spectral ratio pyrometer
JPS57100453A (en) Printer
JPS5714743A (en) System for infrared spectrochemical analysis
JPS533349A (en) Devider for optical fiber and photo coupler
SU845019A1 (en) System for automatic adjusting of interferometer
RU2119182C1 (en) Optical analog-to-digital converter
FR2258062A1 (en) Optical fibre signal transmission system - uses distribution head to transmit optical signal between channels
GB1482076A (en) Focusing of optical systems
GB1260257A (en) Light sensitive apparatus

Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee