WO2001084679A1 - Universal controller for an optical amplifier - Google Patents
Universal controller for an optical amplifier Download PDFInfo
- Publication number
- WO2001084679A1 WO2001084679A1 PCT/US2001/006026 US0106026W WO0184679A1 WO 2001084679 A1 WO2001084679 A1 WO 2001084679A1 US 0106026 W US0106026 W US 0106026W WO 0184679 A1 WO0184679 A1 WO 0184679A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- amplifier
- gain
- optical
- power
- controller
- 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
- H04B10/293—Signal power control
- H04B10/2931—Signal power control using AGC
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/09408—Pump redundancy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06804—Stabilisation of laser output parameters by monitoring an external parameter, e.g. temperature
Definitions
- the controller utilizes a logarithmic circuit. According to another embodiment of the present invention the controller utilizes an electronic gain switch circuit.
- an amplifier characterized by gain and output power comprises: (i) at least one gain medium; (ii) a pump supplying optical power into said gain medium; (iii) a controller controlling said gain and said output power of said amplifier.
- This controller includes an electronic gain switch to cover a wide dynamic range for optical input and output signals, so that resolution for low optical signals is better than resolution for high optical signals.
- the negative effects of low frequency fluctuation of input signal to an EDFA can cause cross talk between channels and decrease signal to noise ratio of the amplifier. Therefore, it is crucial to remove or minimize low-frequency fluctuation effects before they affect the amplifier performance.
- the exemplary amplifiers of the present invention provide suppression of fast (about 50 ⁇ seconds or faster) power and gain transients, as well as pump temperature control and re-configurable signal processing.
- the amplifier's controller accommodates other communication system requirements and has the ability to perform some additional control function (for example, pump laser temperature control, coil temperature control).
- the controller may also provide monitoring, self-testing, and other diagnostic functions, for example alarm processing.
- the controller 120 should provide a balance between the controller sampling speed and the number of bits of resolution of the A/D (analog to digital) converter.
- the electronic controller 120 of this embodiment may utilize at least two alternative methods to overcome this problem. These methods are signal compression, which utilizes logarithmic amplifiers and electronic gain (range) switching method.
- the digital value sampled by the AGC section 160 will be at it's maximum, and will not represent the actual value corresponding to the power of the optical signal.
- the AGC section 160 automatically recognizes that the input signal is in an overflow condition (i.e. the input value being at maximum for a pre-defined, minimum period of time).
- the electronic gain of the saturated A/D driver can be reduced with the proper synchronization with the digital processing algorithm. With this gain reduced, the analog input signal to the A/D converter would no longer be in an overflow condition and normal control processing continues.
- a hysteresis is used to avoid unnecessary, oscillatory gain switching, caused by noise. This noise may be introduced by fluctuations in the optical signal power or can be introduced by electronic circuits.
- Figure 4B represents the behavior of the same amplifier with the functional electronic gain controller. More specifically, it shows that the increase in optical output power is now proportional to the increase in optical input power and the absence of the transient output power spike. It is noted, the gain was held at 20dB.
- the optical section 110 includes EDFA 220 and pump laser(s) 221. At least two optical input signals 222 and 224 are provided to EDFA 220 from the input port 210. The power provided by the signal 222 is variable. Thus, signal 222 represents adding and dropping channels. The signal 224 has a constant value and represents the surviving channels entering the optical amplifier. The optical section 110 of the amplifier amplifies the signals 222 and 224 and provides an amplified output signal 226. A small part 226' of the output signal 226 is provided to the controller 120. A taped input signal 228 is proportional to the total input power provided by lines 222 and 224. This taped signal 228 is also provided to the controller 120.
- Figure 8 shows a simulation block diagram corresponding to the amplifier operating in the power control mode. This simulation block diagram depicts the optical section 110 and the electronic controller 120.
- Figures 9 A - 9D illustrate the closed-loop performance of the amplifier with automatic power control mode.
- Figure 9D corresponds to the actual output power 226 provided by this amplifier. Note that after the output setpoint changed (Figure 9B) the output of the amplifier starts to increase from 13 dBm to 16 dBm.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001255166A AU2001255166A1 (en) | 2000-04-29 | 2001-02-22 | Universal controller for an optical amplifier |
JP2001581388A JP2003533035A (en) | 2000-04-29 | 2001-02-22 | Universal control device for optical amplifier |
EP01928292A EP1295368A1 (en) | 2000-04-29 | 2001-02-22 | Universal controller for an optical amplifier |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20069000P | 2000-04-29 | 2000-04-29 | |
US60/200,690 | 2000-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001084679A1 true WO2001084679A1 (en) | 2001-11-08 |
Family
ID=22742764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/006026 WO2001084679A1 (en) | 2000-04-29 | 2001-02-22 | Universal controller for an optical amplifier |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1295368A1 (en) |
JP (1) | JP2003533035A (en) |
CN (1) | CN1426616A (en) |
AU (1) | AU2001255166A1 (en) |
WO (1) | WO2001084679A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7897895B2 (en) * | 2006-05-01 | 2011-03-01 | General Electric Company | System and method for controlling the power level of a laser apparatus in a laser shock peening process |
EP2018689B1 (en) * | 2006-05-12 | 2009-10-21 | Bookham Technology Plc. | Variable gain optical amplifiers |
JP6476894B2 (en) * | 2015-01-20 | 2019-03-06 | 富士通株式会社 | Optical amplifier array and optical transmission device using the same |
CN108054628B (en) * | 2017-12-05 | 2019-03-19 | 深圳市创鑫激光股份有限公司 | Control system, laser, the equipment with laser of laser |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5363385A (en) * | 1992-03-19 | 1994-11-08 | Alcatel N.V. | Fiber-optic amplifier with control of the pump light wavelength |
US5703711A (en) * | 1995-06-09 | 1997-12-30 | Nec Corporation | In-line optical amplifier |
US5923462A (en) * | 1997-03-28 | 1999-07-13 | Lucent Technologies Inc. | Dynamic gain control system for optical amplifier and method thereof |
-
2001
- 2001-02-22 WO PCT/US2001/006026 patent/WO2001084679A1/en not_active Application Discontinuation
- 2001-02-22 EP EP01928292A patent/EP1295368A1/en not_active Withdrawn
- 2001-02-22 AU AU2001255166A patent/AU2001255166A1/en not_active Abandoned
- 2001-02-22 CN CN01808783A patent/CN1426616A/en active Pending
- 2001-02-22 JP JP2001581388A patent/JP2003533035A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5363385A (en) * | 1992-03-19 | 1994-11-08 | Alcatel N.V. | Fiber-optic amplifier with control of the pump light wavelength |
US5703711A (en) * | 1995-06-09 | 1997-12-30 | Nec Corporation | In-line optical amplifier |
US5923462A (en) * | 1997-03-28 | 1999-07-13 | Lucent Technologies Inc. | Dynamic gain control system for optical amplifier and method thereof |
Also Published As
Publication number | Publication date |
---|---|
JP2003533035A (en) | 2003-11-05 |
CN1426616A (en) | 2003-06-25 |
AU2001255166A1 (en) | 2001-11-12 |
EP1295368A1 (en) | 2003-03-26 |
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