CA2385448A1 - Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (wdm) signals - Google Patents

Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (wdm) signals

Info

Publication number
CA2385448A1
CA2385448A1 CA002385448A CA2385448A CA2385448A1 CA 2385448 A1 CA2385448 A1 CA 2385448A1 CA 002385448 A CA002385448 A CA 002385448A CA 2385448 A CA2385448 A CA 2385448A CA 2385448 A1 CA2385448 A1 CA 2385448A1
Authority
CA
Canada
Prior art keywords
intensity modulated
signals
optical information
modulated optical
information signals
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
CA002385448A
Other languages
French (fr)
Other versions
CA2385448C (en
Inventor
Takeshi Hoshida
Hiroshi Onaka
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.)
Fujitsu Network Communications Inc
Original Assignee
Fujitsu Network Communications, Inc.
Takeshi Hoshida
Hiroshi Onaka
Fujitsu Limited
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 Fujitsu Network Communications, Inc., Takeshi Hoshida, Hiroshi Onaka, Fujitsu Limited filed Critical Fujitsu Network Communications, Inc.
Publication of CA2385448A1 publication Critical patent/CA2385448A1/en
Application granted granted Critical
Publication of CA2385448C publication Critical patent/CA2385448C/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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/67—Optical arrangements in the receiver
    • H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
    • H04B10/677—Optical arrangements in the receiver for all-optical demodulation of the input optical signal for differentially modulated signal, e.g. DPSK signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Abstract

A method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals includes receiving a WDM signal having a plurality of non-intensity modulated optical information signals. A
plurality of the non-intensity modulated optical information signals are converted to intensity modulated signals while the plurality of non-intensity modulated optical information signals are multiplexed in at least a portion of the WDM signal.

Claims (21)

1. A method for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals, comprising:
receiving a wavelength division multiplexed (WDM) signal having a plurality of non-intensity modulated optical information signals; and converting a plurality of the non-intensity modulated optical information signals to intensity modulated signals while the plurality of non-intensity modulated optical information signals are multiplexed in at least a portion of the WDM signal.
2. The method of Claim 1, further comprising converting the plurality of non-intensity modulated optical information signals to intensity modulated signals using a asymmetric Mach-Zender interferometer.
3. The method of Claim 2, wherein the asymmetric Mach-Zender interferometer comprises a free spectral range coinciding with an integer multiple of a channel spacing of the WDM signal.
4. The method of Claim 2, wherein the Mach-Zender interferometer comprises a free spectral range coinciding with a channel spacing of the WDM signal.
5. The method of Claim 1, further comprising converting all non-intensity modulated optical information signals of the WDM signal to intensity modulated signals simultaneously prior to first stage demultiplexing.
6. The method of Claim 1, wherein the plurality of non-intensity modulated optical information signals comprise a set of partially demultiplexed signals from the WDM signal.
7. The method of Claim 1, wherein the WDM signal includes a minimum channel spacing comprising a multiple of a symbol rate of the WDM signal within 0.4 to 0.6 of an integer.
8. The method of Claim 7, wherein the minimal channel spacing comprising a multiple of the symbol rate within substantially 0.5 of the integer.
9. The method of Claim 1, further comprising:
separating the WDM signal into a plurality of partially demultiplexed signals using at least one wavelength interleaver; and converting non-intensity modulated optical information signals in each set simultaneously using an asymmetric Mach-Zender interferometer.
10. A system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals, comprising:
means for receiving a wavelength division multiplexed (WDM) signal having a plurality of non-intensity modulated optical information signals; and means for converting a plurality of the non-intensity modulated optical information signals to intensity modulated signals while the plurality of non-intensity modulated optical information signals are multiplexed in at least a portion of the WDM signal.
11. The system of Claim 10, further comprising means for converting the plurality of non-intensity modulated optical information signals to intensity modulated signals using a asymmetric Mach-Zender interferometer.
12. The system of Claim 11, wherein the asymmetric Mach-Zender interferometer comprises a free spectral range coinciding with an integer multiple of a channel spacing of the WDM signal.
13. The system of Claim 11, wherein the Mach-Zender interferometer comprises a free spectral range coinciding with a channel spacing of the WDM signal.
14. The system of Claim 10, further comprising means for converting all non-intensity modulated optical information signals of the WDM signal to intensity modulated signals simultaneously prior to first stage demultiplexing.
15. The system of Claim 10, wherein the plurality of non-intensity modulated optical information signals comprise a set of partially demultiplexed signals from the WDM signal.
16. The system of Claim 10, wherein the WDM signal includes a minimum channel spacing comprising a multiple of a symbol rate of the WDM signal within 0.4 to 0.6 of an integer.
17. The system of Claim 16, wherein the minimal channel spacing comprising a multiple of the symbol rate within substantially 0.5 of the integer.
18. The system of Claim 10, further comprising:
means for separating the WDM signal into a plurality of partially demultiplexed signals using at least one wavelength interleaver; and means for converting non-intensity modulated optical information signals in each set simultaneously using an asymmetric Mach-Zender interferometer.
19. A demultiplexer for an optical receiver, comprising:
a format converter operable to receive a wavelength division multiplexed (WDM) signal having a plurality of non-intensity modulated optical information signals and to convert the non-intensity modulated optical information signals to intensity modulated optical information signals while multiplexed in the WDM signal;
and a plurality of demultiplexing elements each operable to separate a received set of intensity modulated optical information signals into a plurality of signals each having at least one intensity modulated optical information signal.
20. The demultiplexer of Claim 19, wherein the format converter comprises an asymmetric Mach-Zender interferometer.
21. The demultiplexer of Claim 20, wherein the demultiplex elements comprise Mach-Zender interferometers.
CA2385448A 2001-05-10 2002-05-08 Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (wdm) signals Expired - Fee Related CA2385448C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/853,316 2001-05-10
US09/853,316 US7035543B1 (en) 2001-05-10 2001-05-10 Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals

Publications (2)

Publication Number Publication Date
CA2385448A1 true CA2385448A1 (en) 2002-11-10
CA2385448C CA2385448C (en) 2012-04-24

Family

ID=25315705

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2385448A Expired - Fee Related CA2385448C (en) 2001-05-10 2002-05-08 Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (wdm) signals

Country Status (7)

Country Link
US (1) US7035543B1 (en)
EP (2) EP1393484B1 (en)
JP (1) JP3887603B2 (en)
CN (1) CN100461660C (en)
CA (1) CA2385448C (en)
DE (2) DE60213882T2 (en)
WO (1) WO2002091645A1 (en)

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Also Published As

Publication number Publication date
JP2004530375A (en) 2004-09-30
DE60213882D1 (en) 2006-09-21
EP1393484A1 (en) 2004-03-03
EP1548967A1 (en) 2005-06-29
CN1628431A (en) 2005-06-15
DE60205249D1 (en) 2005-09-01
WO2002091645A1 (en) 2002-11-14
US7035543B1 (en) 2006-04-25
DE60213882T2 (en) 2007-08-30
CN100461660C (en) 2009-02-11
CA2385448C (en) 2012-04-24
EP1393484B1 (en) 2005-07-27
EP1548967B1 (en) 2006-08-09
JP3887603B2 (en) 2007-02-28

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