GB2370650A - Optical multicasting - Google Patents

Optical multicasting Download PDF

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Publication number
GB2370650A
GB2370650A GB0023219A GB0023219A GB2370650A GB 2370650 A GB2370650 A GB 2370650A GB 0023219 A GB0023219 A GB 0023219A GB 0023219 A GB0023219 A GB 0023219A GB 2370650 A GB2370650 A GB 2370650A
Authority
GB
United Kingdom
Prior art keywords
signal
multicasting
optical
power
fwm
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.)
Withdrawn
Application number
GB0023219A
Other versions
GB0023219D0 (en
Inventor
Dimitra Simeonidou
Anna Tzanakaki
Michael O'mahony
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.)
ILOTRON Ltd
Ditech Networks Inc
Original Assignee
ILOTRON Ltd
Ditech Networks 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 ILOTRON Ltd, Ditech Networks Inc filed Critical ILOTRON Ltd
Priority to GB0023219A priority Critical patent/GB2370650A/en
Publication of GB0023219D0 publication Critical patent/GB0023219D0/en
Publication of GB2370650A publication Critical patent/GB2370650A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G02F1/3536—Four-wave interaction
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/3523—Non-linear absorption changing by light, e.g. bleaching
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/26—Pulse shaping; Apparatus or methods therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

An optical signal to be multicast is mixed with a pump signal of appropriate wavelength and power and arranged to enter a nonlinear element. Full wave mixing in the nonlinear component simultaneously produces wavelength conversion and signal reshaping. The number of reshaped components can be selected and used for multicasting the information signal in the same or different fibre pathways.

Description

AN OPTICAL MULTICASTING DEVICE
Field of the Invention The present invention relates to the field of optical networks and in particular to multicasting in optical networks.
Summary of the Invention The present invention describes a simple, single-pass arrangement which can provide multicasting functionality in an optical network, while performing wavelength conversion and signal reshaping.
The present invention utilises the effect of Four Wave Mixing (FWM) in a non-linear element (eg fibre, SOA) and is therefore completely transparent to bit-rate and data format.
According to the present invention a signal to be multicasted is mixed with a pump signal of appropriate wavelength and power and enters a nonlinear optical element. The interaction of the two wavelengths and the nonlinearity produce a number of wavelength components due to FWM mechanism.
The present invention offers multicasting of information signals using the signal wavelengths generated through the FWM process and improved quality of the multicast signals due to reshaping.
Brief Description of the Drawings An example of the present invention will now be described in detail with reference to the accompanying drawings, in which: Figure 1 shows the relationship between the input power and the output power in a typical Four Wave Mixing regime; Figure 2 shows the relationship between the input power and the output power in a strong Four Wave Mixing regime; and, Figure 3 shows schematically an example of the present invention.
Detailed Description As shown in Figure 1, in typical FWM regime, the power of the 1st order FWM component varies linearly with input power at low input power levels and then saturates slowly at high input power levels.
As shown in Figure 2, when strong FWM occurs (several frequency components present) some of the FWM components demonstrate a step-like transfer function.
Figure 3 shows an example of the present invention. A signal to be multicasted is mixed with a pump signal of appropriate wavelength and power and enters a nonlinear optical element. The interaction of the two wavelengths and the nonlinearity produce a number of wavelength components due to FWM mechanism.
Signal reshaping occurs in specific FWM components.
The number and position of the reshaped products will depend on the nonlinear element characteristics (eg dispersion) and can be manipulated.
The number of reshaped components can be selected and used for multicasting the information signal in the same or different fibre paths within the network.
As the FWM components power quickly assume saturated power a static power equlisation scheme will be sufficient to condition the power of the multiplexed signal.

Claims (3)

1. An apparatus for multicasting an optical signal in an optical network, comprising: means to produce a pump signal; means to mix the pump signal with the optical signal to produce a mixed signal; and, a non-linear element through which the mixed signal is passed.
2. A method of multicasting an optical signal in an optical network, comprising the steps of: mixing the optical signal with a pump signal, to produce a mixed signal; and, passing the mixed signal through a non-linear element.
3. An apparatus for multicasting an optical signal in an optical network substantially as described herein with reference to the accompanying drawings.
GB0023219A 2000-09-21 2000-09-21 Optical multicasting Withdrawn GB2370650A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0023219A GB2370650A (en) 2000-09-21 2000-09-21 Optical multicasting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0023219A GB2370650A (en) 2000-09-21 2000-09-21 Optical multicasting

Publications (2)

Publication Number Publication Date
GB0023219D0 GB0023219D0 (en) 2000-11-01
GB2370650A true GB2370650A (en) 2002-07-03

Family

ID=9899897

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0023219A Withdrawn GB2370650A (en) 2000-09-21 2000-09-21 Optical multicasting

Country Status (1)

Country Link
GB (1) GB2370650A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697775A2 (en) * 1994-08-15 1996-02-21 Nippon Telegraph And Telephone Corporation Multiple-channel all-optical TDM-WDM converter and multiple-channel all-optical TDM demultiplexer
EP0981189A2 (en) * 1998-08-19 2000-02-23 Fujitsu Limited Method and apparatus using four wave mixing for optical wavelength conversion
EP1008898A1 (en) * 1998-06-29 2000-06-14 The Furukawa Electric Co., Ltd. Wavelength multiplexing optical transmission system and wavelength converter for wavelength multiplexing optical transmission
EP1076428A2 (en) * 1999-08-10 2001-02-14 Lucent Technologies Inc. Optical fiber communication system employing wavelength converter for broadband transmission
EP1113613A2 (en) * 1999-12-28 2001-07-04 The Furukawa Electric Co., Ltd. Wavelength converting apparatus and wavelength division multiplexing system using same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697775A2 (en) * 1994-08-15 1996-02-21 Nippon Telegraph And Telephone Corporation Multiple-channel all-optical TDM-WDM converter and multiple-channel all-optical TDM demultiplexer
EP1008898A1 (en) * 1998-06-29 2000-06-14 The Furukawa Electric Co., Ltd. Wavelength multiplexing optical transmission system and wavelength converter for wavelength multiplexing optical transmission
EP0981189A2 (en) * 1998-08-19 2000-02-23 Fujitsu Limited Method and apparatus using four wave mixing for optical wavelength conversion
EP1076428A2 (en) * 1999-08-10 2001-02-14 Lucent Technologies Inc. Optical fiber communication system employing wavelength converter for broadband transmission
EP1113613A2 (en) * 1999-12-28 2001-07-04 The Furukawa Electric Co., Ltd. Wavelength converting apparatus and wavelength division multiplexing system using same

Also Published As

Publication number Publication date
GB0023219D0 (en) 2000-11-01

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COOA Change in applicant's name or ownership of the application
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)