GB2370650A - Optical multicasting - Google Patents
Optical multicasting Download PDFInfo
- 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- Withdrawn
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.
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)
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 |
-
2000
- 2000-09-21 GB GB0023219A patent/GB2370650A/en not_active Withdrawn
Patent Citations (5)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
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) |