WO2002075976A1 - Erbium doped fibre amplifier having a tuneable pump laser - Google Patents
Erbium doped fibre amplifier having a tuneable pump laser Download PDFInfo
- Publication number
- WO2002075976A1 WO2002075976A1 PCT/GB2002/001301 GB0201301W WO02075976A1 WO 2002075976 A1 WO2002075976 A1 WO 2002075976A1 GB 0201301 W GB0201301 W GB 0201301W WO 02075976 A1 WO02075976 A1 WO 02075976A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser
- pump laser
- amplifier
- pump
- fibre
- Prior art date
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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
Definitions
- the present invention relates to an optical amplifier, in particular an erbium doped fibre amplifier (EDFA), having control means to compensate for non optimum performance.
- EDFA erbium doped fibre amplifier
- the fibre length In an optical amplifier, such as an EDFA, for a given pump power, to obtain the maximum amount of gain for a given erbium concentration in the fibre core, the fibre length should be increased to the point at whic the pump power becomes equal to the intrinsic pump threshold. This determines the optimum length of the fibre to maximise the signal gain for the amplifier. However, for other applications, the fibre length may need to be optimised for other parameters such as the noise figure or output saturation power.
- the fibre length may prove to be sub-optimal. It is known to compensate for sub-optimal performance of an optical amplifier by increasing the pump power. It is also known to tailor the gain of a WDM amplifier by an appropriate choice of the fibre length.
- the present invention seeks to provide an optical amplifier with control means which control means is adapted to modify the gain in situ.
- an optical amplifier having a pump laser, which pump laser is adapted to pump an optical fibre in an optical circuit via an opto-coupier, Wuerein t .e pump aser is a tuneable laser.
- the amplifier is an erbium doped fibre amplifier.
- the pump laser is a ITJ-N semiconductor tuneable laser.
- the ability to tune the wavelength of the pump laser allows the laser wavelength to be matched to the assembled components. This is particularly advantageous as it is simpler to tune the laser than to change the length of fibre in the amplifier once the amplifier has been assembled.
- Fig.l shows a schematic representation of an EDFA DETAILED DESCRIPTION OF THE EMBODIMENT
- the amplifier is connected between an optical fibre input line 1 and an output line 2, the fibres being formed of a silica core of 7nm diameter surrounded by an outer sleeve of silica having a different refractive index of approximately 120nm.
- the amplifier is intended for the transmission of optical signals at a frequency of approximately 1530nm to form a telecornmunication transmission signal.
- the input line 1 is optically connected to a dichroic coupler 3, which, in turn, is connected to the output line 2 via a fibre coil 4.
- the fibre coil 4 is doped with erbium which, when excited by an applied signal at the right frequency, is amplified.
- a tuneable laser 5 is connected optically to the dichroic coupler 3 so that when an electrical signal is applied to the laser 5, a light signalis transmitted to the fibre coil 4 through the dichroic coupler 3.
- the erbium ions in the erbium doped optical fibre coil 4 are inverted by the pumped signal to generate a signal gain.
- the pump laser 5 is a wavelength tuneable laser having sampled gratings at the front and rear of its gain region.
- the gratings produce slightly different reflection combs which provide feedback into the device.
- the gratings can be current tuned in wavelength with respect to each other. Co-incidence of a maximum from each of the front and rear gratings is referred to as a supermode.
- To switch the device between super modes requires a small electrical current into one of the gratings to cause a different pair of maxima to co-incide in the manner of a vernier. By applying different electrical currents to the two gratings, continuous tuning wilhin a supermode can be achieved.
- a tuneable laser as a pump laser enables the pump laser to also fulfil a function as a control means not simply for power. This enables the wavelength of the pump laser to be matched to the assembled components in the EDFA to optimise performance rather than having to re-splice the fibre with the concomitant risks of fibre damage and further deterioration in amplifier performance.
- the laser 5 has been described as a Segmented Grating-DBR, it would be possible to use other types of tuneable laser such as a Phase Shift Grating Distributed Bragg Reflector laser. It would also be possible to use non current driven tuneable lasers in appropriate circumstances.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0106769.3 | 2001-03-19 | ||
GB0106769A GB2377814A (en) | 2001-03-19 | 2001-03-19 | Optical amplifier with tunable pump laser |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002075976A1 true WO2002075976A1 (en) | 2002-09-26 |
Family
ID=9911012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2002/001301 WO2002075976A1 (en) | 2001-03-19 | 2002-03-19 | Erbium doped fibre amplifier having a tuneable pump laser |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2377814A (en) |
WO (1) | WO2002075976A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1848073A1 (en) | 2006-04-19 | 2007-10-24 | Multitel ASBL | Switchable laser device and method for operating said device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0721261A1 (en) * | 1995-01-09 | 1996-07-10 | AT&T Corp. | Self-amplified optical networks |
US6178036B1 (en) * | 1997-01-14 | 2001-01-23 | California Institute Of Technology | Opto-electronic devices and systems based on brillouin selective sideband amplification |
EP1076429A2 (en) * | 1999-08-10 | 2001-02-14 | Lucent Technologies Inc. | Band conversion apparatus for optical transmission systems |
WO2001016642A2 (en) * | 1999-09-02 | 2001-03-08 | Agility Communications, Inc. | Integrated opto-electronic wavelength converter assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5539571A (en) * | 1992-09-21 | 1996-07-23 | Sdl, Inc. | Differentially pumped optical amplifer and mopa device |
US5912910A (en) * | 1996-05-17 | 1999-06-15 | Sdl, Inc. | High power pumped mid-IR wavelength systems using nonlinear frequency mixing (NFM) devices |
US6144486A (en) * | 1998-01-30 | 2000-11-07 | Corning Incorporated | Pump wavelength tuning of optical amplifiers and use of same in wavelength division multiplexed systems |
-
2001
- 2001-03-19 GB GB0106769A patent/GB2377814A/en not_active Withdrawn
-
2002
- 2002-03-19 WO PCT/GB2002/001301 patent/WO2002075976A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0721261A1 (en) * | 1995-01-09 | 1996-07-10 | AT&T Corp. | Self-amplified optical networks |
US6178036B1 (en) * | 1997-01-14 | 2001-01-23 | California Institute Of Technology | Opto-electronic devices and systems based on brillouin selective sideband amplification |
EP1076429A2 (en) * | 1999-08-10 | 2001-02-14 | Lucent Technologies Inc. | Band conversion apparatus for optical transmission systems |
WO2001016642A2 (en) * | 1999-09-02 | 2001-03-08 | Agility Communications, Inc. | Integrated opto-electronic wavelength converter assembly |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1848073A1 (en) | 2006-04-19 | 2007-10-24 | Multitel ASBL | Switchable laser device and method for operating said device |
Also Published As
Publication number | Publication date |
---|---|
GB0106769D0 (en) | 2001-05-09 |
GB2377814A (en) | 2003-01-22 |
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