CN1777069A - Fully optical-fiber erbium-doped Brillouin amplifier - Google Patents
Fully optical-fiber erbium-doped Brillouin amplifier Download PDFInfo
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- CN1777069A CN1777069A CNA2005101115130A CN200510111513A CN1777069A CN 1777069 A CN1777069 A CN 1777069A CN A2005101115130 A CNA2005101115130 A CN A2005101115130A CN 200510111513 A CN200510111513 A CN 200510111513A CN 1777069 A CN1777069 A CN 1777069A
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Abstract
In the invention, output from semiconductor laser is divided into two routes by a first 50/50 optical branching device, and one route is connected to the first optical ring unit, which has three optical ports. The other two ports are connected to a first optical fiber in single mode and second 50/50 optical branching device respectively. First erbium doped optical fiber amplifier is connected between second 50/50 optical branching device and first optical fiber in single mode. Another route of the first 50/50 optical branching device is connected to second erbium doped optical fiber amplifier, output of which is connected to second optical ring unit. Second optical fiber in single mode is connected between a port of the second optical ring unit and another output end of the second 50/50 optical branching device. Magnified optical signal is output from another port of the second optical ring unit. Features are: low noise in relative intensity, having output in single frequency etc.
Description
Technical field
What the present invention relates to is a kind of amplifier of technical field of optical fiber communication, particularly a kind of fully optical-fiber erbium-doped Brillouin amplifier.
Background technology
In analog optical fiber communication, the performance of light source will directly determine the performance of analog signal transmission, and as dynamic range, carrier-to-noise ratio etc., and system cost also is a key factor that needs consideration.Therefore high-output power, low noise, light source can adopt in analogue system cheaply.Semiconductor laser is the light source commonly used in the analogue system, but its peak power output is subjected to the restriction of process conditions.In order to obtain high power output, the power output that people use erbium-doped fiber amplifier (EDFA) to come the amplifying laser device usually will cause big signal-spontaneous radiation beat frequency noise but EDFA amplifies the spontaneous emission noise that causes, thereby influence systematic function.Solid state laser can satisfy high-output power and low noise simultaneously, but it is bulky and with high costs, and is not quite suitable in practical communication system.Therefore high power, low noise, image intensifer is the preferred plan of effective head it off cheaply.
Find through literature search prior art, " Hybrid Brillouin/erbium dopedfiber amplifier apparatus and method; (" mix Brillouin/erbium-doped fiber amplifier method and technology ") application number is 20030142392 has proposed a kind of high power, low noise, technology of image intensifer cheaply of realizing to United States Patent (USP) in this patent.The power output that this technology utilization mixing erbium-Brillouin amplifier comes the amplifying laser device at first uses Brillouin's frequency (about 10.8GHz) that laser is carried out phase modulated, and the sideband that modulation produces obtains Brillouin's amplification becomes new laser output; The narrow bandwidth performance of Brillouin's amplification simultaneously filters out high-frequency signal noise beat frequency, thereby causes low relative intensity noise output.Compare solid state laser, this amplifier can largely reduce cost.But also there are a lot of problems in this amplifier.At first, because the Brillouin shift of optical fiber can be along with variation of ambient temperature, the typical change amplitude is 1.35M/ ℃, and therefore in order to realize that effective Brillouin amplifies, this amplifier needs signal monitoring and temperature control in actual applications.Secondly, this amplifier need use high frequency phase-modulator and signal generator, thereby has increased cost.Once more, phase-modulator can produce a plurality of modulation sideband,s, and these sidebands and direct current power meeting and the laser power of amplifying are exported together, thereby influences the quality of output signal.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of fully optical-fiber erbium-doped Brillouin amplifier is provided, make it have the stable not advantage of temperature influence of high power, low noise, low cost and output.
The present invention is achieved by the following technical solutions, the present invention includes: semiconductor laser, two 50/50 optical branching devices, two section single-mould fibers, two optical circulators, two erbium-doped fiber amplifiers.The output of semiconductor laser is divided into two-way by the one 50/50 optical branching device, and one the tunnel links to each other with first optical circulator.First optical circulator has three ports, and its remaining port connects first monomode fiber (as 200m), and another port links to each other with the 2 50/50 optical branching device, is connected first erbium-doped fiber amplifier between the 2 50/50 optical branching device and first monomode fiber.Another road of the one 50/50 optical branching device connects second erbium-doped fiber amplifier, the output of second erbium-doped fiber amplifier connects second optical circulator, is connected second monomode fiber (as 25km) between another output of port of second optical circulator and the 2 50/50 optical branching device.Another port output of optical signals second optical circulator that amplifies.Naked fine welding mode is all adopted in connection between all component, convenient integrated encapsulation.
Described semiconductor laser is used to export lower powered continuous laser, and its wavelength is the amplification wave band of erbium-doped fiber amplifier.
Described two 50/50 optical branching devices all use 1 * 2 type, and the 2 50/50 optical branching device also can be changed to 30/70 or 20/80 according to demanded power output, and the small-power port is used to export laser.
Described first erbium-doped fiber amplifier is low power amplifier, and use therein Er-doped fiber length is lacked (less than 10m), pump power less (less than 50mW).
Described second erbium-doped fiber amplifier is high power amplifier, and its saturation output power is at least greater than 14dBm.
Described first optical circulator is formed a Brillouin/erbium fiber laser with the 2 50/50 optical branching device, first monomode fiber, first erbium-doped fiber amplifier.First optical circulator is used for importing the pumping of Brillouin/erbium fiber laser and guarantees the counterclockwise propagation of Brillouin laser in the chamber.
Described second optical circulator is formed a Brillouin amplifier with second monomode fiber, second erbium-doped fiber amplifier.Second optical circulator is used to import the pumping of Brillouin amplifier and exports final amplifying signal.
Described first monomode fiber, its type are standard single-mode fiber (G652), and length is hundreds of rice, is used to produce Brillouin laser.
Described second monomode fiber, its type are standard single-mode fiber (G652), and length is tens of kilometers, is used to amplify Brillouin laser.
The present invention can be divided into two big parts, and a part is Brillouin/erbium fiber laser, and another part is a Brillouin amplifier.Semiconductor laser is divided into two-way output by an optical branching device, and the one road is used to excite the monomode fiber in this fiber laser to produce Brillouin laser as Brillouin's pumping of Brillouin/erbium fiber laser.The gain media of this fiber laser is made up of monomode fiber and erbium-doped fiber amplifier, and wherein erbium-doped fiber amplifier provides main gain.When gain was decreased greater than the chamber, Brillouin laser formed.The non-linear gain immixture of the linear gain of monomode fiber and Er-doped fiber has caused the single mode output characteristic of Brillouin laser.As the pumping of Brillouin amplifier, the single mode Brillouin laser of fiber laser output then obtains amplifying as the input signal of Brillouin amplifier after erbium-doped fiber amplifier amplifies on another road of semiconductor laser.The Brillouin laser of amplifier is the final output of this mixer amplifier.
The present invention uses a Brillouin/erbium fiber laser to replace phase-modulator and signal generator in original technology.Because the monomode fiber model of using in Brillouin/erbium fiber laser and the Brillouin amplifier is identical, therefore the temperature variant characteristic of its Brillouin shift is also identical, and the single longitudinal mode Brillouin laser that Brillouin/erbium fiber laser produces and the difference on the frequency of Brillouin amplifier pumping accurately equal the Brillouin shift of monomode fiber and temperature independent.Therefore power output of the present invention can not be subjected to Temperature Influence.Variation of temperature can cause the trickle change of output frequency, about 1.35M/ ℃, and within tolerance interval.The present invention does not need high-speed phase modulator and signal generator, can further reduce product cost.The single longitudinal mode output of Brillouin/erbium fiber laser has determined single-frequency output of the present invention.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is a power output schematic diagram of the present invention
Fig. 3 is a low noise schematic diagram of the present invention
Fig. 4 is used for the dynamic range test structure figure of simulated light communication system for the present invention
Fig. 5 is used for the dynamic range test result figure of analogue system for the present invention
Embodiment
As shown in Figure 1, the one 50/50 optical branching device 2 is divided into two-way with the output of semiconductor laser 1.The first long monomode fiber 1 of first optical circulator one section 200m of 6 inputs of leading up to has produced back to stimulated Brillouin scattering, and this scattered light obtains the mixing of first monomode fiber 4 of low-power first erbium-doped fiber amplifier 8 and 200m length and amplifies.Wherein the Er-doped fiber length of low-power first erbium-doped fiber amplifier 8 is 5m, and pump power is 30mW.This low power amplifier provides main chamber gain.When gain was decreased greater than the chamber, Brillouin laser formed.The non-linear gain immixture of the linear gain of first monomode fiber and Er-doped fiber has caused the single mode output characteristic of Brillouin laser, and this single longitudinal mode Brillouin laser is from 3 outputs of the 2 50/50 optical branching device.Another road output of the one 50/50 optical branching device 2 is imported the single longitudinal mode Brillouin laser of the long monomode fiber of 25km as its Brillouin's pumping amplifying fiber other end input through second optical circulator 7 after high power second erbium-doped fiber amplifier 9 amplifies.The single longitudinal mode Brillouin laser obtains behind the brillouin gain another port output the becoming amplifying laser that finally obtains from second optical circulator 7.
Characteristics of output power of the present invention as shown in Figure 2.Connect on request after all light paths, test the power output of this amplifier with light power meter.The power output of semiconductor laser 1 is 0dBm, and all the other parameters are the parameter in the technical descriptioon.Record under maximum Brillouin's pump power 14dBm condition, the power output of this amplifier is 10dBm.Change Brillouin's pump power, and detect corresponding amplifier power output, power output exponential increase with the increase of Brillouin's pump power, the pumping transformation efficiency is about 40%.If use high power EDFA as pumping, this amplifier can obtain very high power output.
Noise characteristic of the present invention as shown in Figure 3.The output of this amplifier is connected to the photoelectric detector of a 10G bandwidth, and is observing the electrical noise after transforming compose on the rf signal analysis instrument.Mainly comprise quantum noise, signal-spontaneous radiation beat frequency noise and signal-signal beat frequency noise through the electrical noise behind the photoelectric detector.Wherein signal-signal beat frequency noise accounts for main component.For the noiseproof feature of this amplifier of intuitivism apprehension, the semiconductor laser 1 that EDFA is amplified is connected to the 10G photoelectric detector and observes its noise power simultaneously.In order under equal conditions to compare noise, the Output optical power of two kinds of amplifiers is 10dBm.Can get the beat frequency noise approximately low 10dB of the beat frequency noise of mixer amplifier than EDFA from the observation of rf signal analysis instrument.The relative intensity noise of the semiconductor laser 1 after this mixer amplifier amplifies is about-150dBm/Hz.Improve pump power and can improve the amplifier power output, but can not improve its relative intensity noise.
In order to prove the advantage that low-noise performance embodied of this mixer amplifier in analog communication system, measured the dynamic range of the analog communication system of using this amplifier.Equally, for relatively, also measured the dynamic range of using the analog communication chain of EDFA.Test structure as shown in Figure 4, the Output optical power of two amplifiers is 10dBm.Output optical power is modulated by the radio-frequency (RF) signal strength of 1.8GHz and 1.9GHz. and the luminous power after the modulation enters photoelectric detector through a variable optical attenuator.The saturated input power of this photoelectric detector is-7dBm, by regulating luminous power that variable optical attenuator guarantees to enter photoelectric detector less than-7dBm, thereby guarantees that photoelectric detector is operated in linear zone.Connect rf signal analysis instrument observation output radiofrequency signal behind the photoelectric detector.Increase the power of input radio frequency signal, because the cross modulation effect, two new radiofrequency signals will produce, and be respectively the linear work performances that the generation of 1.7GHz and the new frequency of 2.0GHz. will influence analogue system.When the power output of new frequency equaled the power output of original frequency, this system reached working limit. and the dynamic range that measures the analog optical fiber chain that uses mixer amplifier is 81.4dBHz
2/3, use the analog optical fiber chain of EDFA to improve 7.7dB relatively, as shown in Figure 5.The raising of dynamic range comes from the reduction of this mixer amplifier noise just.
Claims (10)
1. full fiber mix er-doped-Brillouin amplifier, comprise: a semiconductor laser (1), two 50/50 optical branching devices (2,3), two section single-mould fibers (4,5), two optical circulators (6,7), two erbium-doped fiber amplifiers (8,9), it is characterized in that, the output of semiconductor laser (1) is divided into two-way by the one 50/50 optical branching device (2), one the tunnel links to each other with first optical circulator (6), first optical circulator (6) has three ports, its remaining port connects first monomode fiber (4), another port links to each other with the 2 50/50 optical branching device (3), be connected first erbium-doped fiber amplifier (8) between the 2 50/50 optical branching device (3) and first monomode fiber (4), another road of the one 50/50 optical branching device (2) connects second erbium-doped fiber amplifier (9), the output of second erbium-doped fiber amplifier (9) connects second optical circulator (7), between another output of port of second optical circulator (7) and the 2 50/50 optical branching device (3), be connected second monomode fiber (5), another port output of optical signals second optical circulator (7) of amplification.
2. full fiber mix er-doped-Brillouin amplifier according to claim 1 is characterized in that described semiconductor laser (1) is used to export lower powered continuous laser, and its wavelength is the amplification wave band of erbium-doped fiber amplifier.
3. full fiber mix er-doped-Brillouin amplifier according to claim 1 is characterized in that, described two 50/50 optical branching devices (2,3) are 1 * 2 type.
4. according to claim 1 or 3 described full fiber mix er-doped-Brillouin amplifiers, it is characterized in that described the 2 50/50 optical branching device (3) perhaps is 30/70 or 20/80 according to demanded power output, the small-power port is used to export laser.
5. full fiber mix er-doped-Brillouin amplifier according to claim 1 is characterized in that described first erbium-doped fiber amplifier (8) is low power amplifier, and use therein Er-doped fiber length is less than 10m, and pump power is less than 50mW.
6. full fiber mix er-doped-Brillouin amplifier according to claim 1 is characterized in that described second erbium-doped fiber amplifier (9) is high power amplifier, and its saturation output power is at least greater than 14dBm.
7. full fiber mix er-doped-Brillouin amplifier according to claim 1, it is characterized in that, described first optical circulator (6), form a Brillouin/erbium fiber laser with the 2 50/50 optical branching device (3), first monomode fiber (4), first erbium-doped fiber amplifier (8), first optical circulator (6) is used for importing the pumping of Brillouin/erbium fiber laser and guarantees the counterclockwise propagation of Brillouin laser in the chamber.
8. full fiber mix er-doped-Brillouin amplifier according to claim 1, it is characterized in that, described second optical circulator (7), form a Brillouin amplifier with second monomode fiber (5), second erbium-doped fiber amplifier (9), second optical circulator (7) is used to import the pumping of Brillouin amplifier and exports final amplifying signal.
9. full fiber mix er-doped-Brillouin amplifier according to claim 1 is characterized in that, described first monomode fiber (4), and its type is a standard single-mode fiber, length is hundreds of rice, is used to produce Brillouin laser.
10. full fiber mix er-doped-Brillouin amplifier according to claim 1 is characterized in that, described second monomode fiber (5), and its type is a standard single-mode fiber, length is tens of kilometers, is used to amplify Brillouin laser.
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| CNA2005101115130A CN1777069A (en) | 2005-12-15 | 2005-12-15 | Fully optical-fiber erbium-doped Brillouin amplifier |
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| CNA2005101115130A CN1777069A (en) | 2005-12-15 | 2005-12-15 | Fully optical-fiber erbium-doped Brillouin amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145852B (en) * | 2007-11-01 | 2010-05-19 | 上海交通大学 | High-power optical fiber Brillouin amplifier for full optical buffer |
| CN101453273B (en) * | 2007-12-07 | 2012-01-25 | 华为海洋网络有限公司 | Optical relay device and bidirectional service transmission method |
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2005
- 2005-12-15 CN CNA2005101115130A patent/CN1777069A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145852B (en) * | 2007-11-01 | 2010-05-19 | 上海交通大学 | High-power optical fiber Brillouin amplifier for full optical buffer |
| CN101453273B (en) * | 2007-12-07 | 2012-01-25 | 华为海洋网络有限公司 | Optical relay device and bidirectional service transmission method |
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