CA2138828A1 - Method and Apparatus to Compensate for Differential Attenuation in an Optical Time Slot Interchanger - Google Patents

Method and Apparatus to Compensate for Differential Attenuation in an Optical Time Slot Interchanger

Info

Publication number
CA2138828A1
CA2138828A1 CA2138828A CA2138828A CA2138828A1 CA 2138828 A1 CA2138828 A1 CA 2138828A1 CA 2138828 A CA2138828 A CA 2138828A CA 2138828 A CA2138828 A CA 2138828A CA 2138828 A1 CA2138828 A1 CA 2138828A1
Authority
CA
Canada
Prior art keywords
time slot
optical time
compensate
differential attenuation
look
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
CA2138828A
Other languages
French (fr)
Other versions
CA2138828C (en
Inventor
Ronald Anthony Spanke
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2138828A1 publication Critical patent/CA2138828A1/en
Application granted granted Critical
Publication of CA2138828C publication Critical patent/CA2138828C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant

Abstract

Look-ahead control techniques and a variable attenuator are used to solve the known problem of differential attenuation of photonic intensities between time slots are delayed differently in delay paths that have different losses which optical time slot interchangers have. The result of the look-ahead control techniques and variable attenuator is a data frame in which the widely varying photonic intensities are equalized to a substantially similar level, thereby greatly reducing the bit error rate of the downstream receiver/demodulator.
CA002138828A 1994-03-31 1994-12-22 Method and apparatus to compensate for differential attenuation in an optical time slot interchanger Expired - Fee Related CA2138828C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/221,206 US5572350A (en) 1994-03-31 1994-03-31 Method and apparatus to compensate for differential attenuation in an optical time slot interchanger
US221,206 1994-03-31

Publications (2)

Publication Number Publication Date
CA2138828A1 true CA2138828A1 (en) 1995-10-01
CA2138828C CA2138828C (en) 1999-04-06

Family

ID=22826818

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002138828A Expired - Fee Related CA2138828C (en) 1994-03-31 1994-12-22 Method and apparatus to compensate for differential attenuation in an optical time slot interchanger

Country Status (5)

Country Link
US (1) US5572350A (en)
EP (1) EP0680233A3 (en)
JP (1) JPH07312588A (en)
CN (1) CN1115526A (en)
CA (1) CA2138828C (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0837499A (en) * 1994-07-25 1996-02-06 Anritsu Corp Optical signal receiver
US5956437A (en) * 1997-12-24 1999-09-21 Northern Telecom Limited Electrically controllable optical attenuator
US20020075536A1 (en) * 1998-06-30 2002-06-20 Xiang-Dong Cao Multi-wavelength all-optical regenerators ( mars)
US6236481B1 (en) 1999-06-09 2001-05-22 Astarte Fiber Networks, Inc. Method and apparatus for providing loss equalization and adjustment in a fiber optic network
JP3440886B2 (en) * 1999-06-16 2003-08-25 日本電気株式会社 WDM optical transmission system
US7099592B2 (en) * 2001-02-02 2006-08-29 Oyster Optics, Inc. Telecommunications card for secure optical data transmission and installation method
US20020131106A1 (en) 2001-03-16 2002-09-19 Peter Snawerdt Secure wave-division multiplexing telecommunications system and method
AU2002318180A1 (en) * 2001-07-09 2003-01-29 Oyster Optics, Inc. Fiber optic telecommunications card with security detection
GB0123640D0 (en) * 2001-09-19 2003-04-09 Matra Bae Dynamics Uk Ltd Multiple pulse generation
US7088495B2 (en) * 2002-06-03 2006-08-08 Sparta, Inc. Method and apparatus for time-division multiplexing to improve the performance of multi-channel non-linear optical systems
US7437082B1 (en) * 2002-07-12 2008-10-14 Broadwing Corporation Private optical communications systems, devices, and methods
KR100454683B1 (en) * 2002-11-01 2004-11-03 한국전자통신연구원 A switching apparatus and producing method thereof with equal insertion loss
US6825786B1 (en) * 2003-05-06 2004-11-30 Standard Microsystems Corporation Associative noise attenuation
CN100359819C (en) * 2003-06-21 2008-01-02 中兴通讯股份有限公司 Line loss automatic compensation system and method for active indoor distributed system
US7551851B2 (en) * 2004-11-19 2009-06-23 Cox Communications, Inc. System and method for bypassing a faulty node in an optical network
CN103676708B (en) * 2013-10-31 2017-07-28 江苏奥雷光电有限公司 A kind of controllable light attenuator and its application method
US20170104526A1 (en) * 2015-10-07 2017-04-13 Tyco Electronics Corporation Stressed optical transmitter and method of compliance testing an optical receiver
US10778248B1 (en) 2020-01-30 2020-09-15 TenaFe, Inc. Low-density parity-check decoding with de-saturation

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4128759A (en) * 1977-11-21 1978-12-05 The United States Of America As Represented By The Secretary Of The Navy Fiber optic delay line filter
DE3416493A1 (en) * 1984-05-04 1985-11-07 Standard Elektrik Lorenz Ag, 7000 Stuttgart OPTICAL RECEIVING DEVICE
US4681395A (en) * 1985-02-22 1987-07-21 Eldec Corporation Time-domain intensity normalization for fiber optic sensing
JPS63175556A (en) * 1987-01-14 1988-07-19 Nippon Telegr & Teleph Corp <Ntt> Optical reception circuit
JPS63223615A (en) * 1987-03-12 1988-09-19 Fujitsu Ltd External modulator
JPH025663A (en) * 1988-06-23 1990-01-10 Nec Corp Optical packet exchange
US4991975A (en) * 1988-11-22 1991-02-12 At&T Bell Laboratories Division multiplexing and demultiplexing means lightwave communication system comprising optical time
US4922479A (en) * 1988-12-23 1990-05-01 Gte Laboratories Incorporated Optical time slot interchanger using one-bit memory cells
JPH03104433A (en) * 1989-09-19 1991-05-01 Nippon Telegr & Teleph Corp <Ntt> Method for optical reception level adjustment
US5103333A (en) * 1989-10-16 1992-04-07 Gte Laboratories Incorporated Photonic time-slot interchangers using cascade-structured integrated optical switches
JPH03136529A (en) * 1989-10-23 1991-06-11 Nec Corp Optical receiver circuit
US5276543A (en) * 1991-11-22 1994-01-04 Gte Laboratories Incorporated Optical signal equalizer for wavelength division multiplexed optical fiber systems
US5214729A (en) * 1991-12-31 1993-05-25 Gte Laboratories Incorporated Dynamic optical data buffer

Also Published As

Publication number Publication date
US5572350A (en) 1996-11-05
EP0680233A3 (en) 1996-08-07
JPH07312588A (en) 1995-11-28
EP0680233A2 (en) 1995-11-02
CA2138828C (en) 1999-04-06
CN1115526A (en) 1996-01-24

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