CA2051020A1 - Optical transmission network with frequency locking means - Google Patents

Optical transmission network with frequency locking means

Info

Publication number
CA2051020A1
CA2051020A1 CA2051020A CA2051020A CA2051020A1 CA 2051020 A1 CA2051020 A1 CA 2051020A1 CA 2051020 A CA2051020 A CA 2051020A CA 2051020 A CA2051020 A CA 2051020A CA 2051020 A1 CA2051020 A1 CA 2051020A1
Authority
CA
Canada
Prior art keywords
frequency
subscriber
transmitter
network
local oscillator
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.)
Granted
Application number
CA2051020A
Other languages
French (fr)
Other versions
CA2051020C (en
Inventor
Mattijs Oskar Van Deventer
Johan Pieter Bekooij
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.)
Koninklijke KPN NV
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2051020A1 publication Critical patent/CA2051020A1/en
Application granted granted Critical
Publication of CA2051020C publication Critical patent/CA2051020C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters

Abstract

Frequency stabilizing in a, for instance star/branched-tree shaped, network can be well executed by locking the frequencies (f1) of the transmitters (T1) in the network centre to a common reference frequency source (CFC) and, moreover, per duplex connection, locking (at a fixed frequency distance) the frequency (f2) of the subscriber's transmitter (T2) to the transmission signal (t1) as received from the network centre's transmitter (T1).
Per duplex connection only the subscriber's local oscillator (L2) has to be tuned so that the transmission signal from the network centre is received optimally. If the subscriber's local oscillator is tuned thus and the subscriber transmitter's frequency has the right frequency offset to the tuned local oscillator frequency (f4), at the network centre's side, signals from the subscriber's transmitter will be received optimally too if the local oscillator (L1) of the network centre's receiver (R1) is set at a certain (predetermined) frequency offset to the signal transmitted to the subscriber's receiver.
Frequency setting, at the network centre's side and at the subscriber's side, can be executed by means of auxiliary receivers (R1a,R2a) and AFC-units, generating the various frequency control signals, or by means of the receivers (R1,R2) already in use, provided with multiple pass filters and AFC-units. For achieving relative low IF frequencies, certain frequency orders are preferred.
CA002051020A 1990-09-11 1991-09-10 Optical transmission network with frequency locking means Expired - Fee Related CA2051020C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP90202410.8 1990-09-11
EP90202410A EP0474921B1 (en) 1990-09-11 1990-09-11 Optical transmission network with frequency locking means

Publications (2)

Publication Number Publication Date
CA2051020A1 true CA2051020A1 (en) 1992-03-12
CA2051020C CA2051020C (en) 1994-10-18

Family

ID=8205114

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002051020A Expired - Fee Related CA2051020C (en) 1990-09-11 1991-09-10 Optical transmission network with frequency locking means

Country Status (7)

Country Link
US (1) US5315425A (en)
EP (1) EP0474921B1 (en)
JP (1) JP2724779B2 (en)
AT (1) ATE130711T1 (en)
CA (1) CA2051020C (en)
DE (1) DE69023768T2 (en)
ES (1) ES2080786T3 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9201077A (en) * 1992-06-18 1994-01-17 Nederland Ptt OPTICAL TRANSMISSION SYSTEM WITH FREQUENCY CONTROL.
GB9306136D0 (en) * 1993-03-24 1993-05-12 Plessey Telecomm Opto-electronic circuits
US5443227A (en) * 1993-10-15 1995-08-22 Hughes Aircraft Company Switching control for multiple fiber-guided missile systems
US5532856A (en) * 1994-06-30 1996-07-02 Nec Research Institute, Inc. Planar optical mesh-connected tree interconnect network
JPH09162849A (en) * 1995-10-05 1997-06-20 Canon Inc Control method for selected wavelength by optical filter, wavelength control method, wavelength multiplexing method and wavelength correction method
US5937341A (en) 1996-09-13 1999-08-10 University Of Washington Simplified high frequency tuner and tuning method
US7209664B1 (en) * 2003-06-10 2007-04-24 Nortel Networks Limited Frequency agile transmitter and receiver architecture for DWDM systems
US7272375B2 (en) 2004-06-30 2007-09-18 Silicon Laboratories Inc. Integrated low-IF terrestrial audio broadcast receiver and associated method
US8651174B2 (en) 2007-05-16 2014-02-18 Gulfstream Services, Inc. Method and apparatus for dropping a pump down plug or ball

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685099A (en) * 1982-05-19 1987-08-04 Maxon Electronics Co. Ltd. Method and apparatus for duplex communications
US4489413A (en) * 1982-07-19 1984-12-18 M/A-Com Dcc, Inc. Apparatus for controlling the receive and transmit frequency of a transceiver
JPS60242739A (en) * 1984-05-17 1985-12-02 Nec Corp Frequency multiplex optical transmitter
GB8522821D0 (en) * 1985-09-16 1985-10-23 British Telecomm Frequency referencing system
JPS62122344A (en) * 1985-11-22 1987-06-03 Hitachi Ltd Optical transmission system
FR2593654B1 (en) * 1986-01-28 1988-03-11 Comp Generale Electricite COHERENT PHOTON TELECOMMUNICATIONS DEVICE.
DE3854730T2 (en) * 1987-06-09 1996-05-02 At & T Corp Optical transmission system with constant frequency group.
JP2625758B2 (en) * 1987-09-21 1997-07-02 ソニー株式会社 Sampling frequency conversion circuit
JPH01192238A (en) * 1988-01-28 1989-08-02 Fujitsu Ltd Bidirectional coherent optical communication system
JPH0642638B2 (en) * 1989-02-09 1994-06-01 株式会社東芝 Wireless communication device

Also Published As

Publication number Publication date
EP0474921A1 (en) 1992-03-18
EP0474921B1 (en) 1995-11-22
CA2051020C (en) 1994-10-18
JP2724779B2 (en) 1998-03-09
US5315425A (en) 1994-05-24
DE69023768T2 (en) 1996-05-23
JPH04339426A (en) 1992-11-26
DE69023768D1 (en) 1996-01-04
ATE130711T1 (en) 1995-12-15
ES2080786T3 (en) 1996-02-16

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Legal Events

Date Code Title Description
EEER Examination request
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