CN102243412A - All-optical-fiber wavelength conversion method - Google Patents
All-optical-fiber wavelength conversion method Download PDFInfo
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- CN102243412A CN102243412A CN2011101582129A CN201110158212A CN102243412A CN 102243412 A CN102243412 A CN 102243412A CN 2011101582129 A CN2011101582129 A CN 2011101582129A CN 201110158212 A CN201110158212 A CN 201110158212A CN 102243412 A CN102243412 A CN 102243412A
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Abstract
The invention discloses an all-optical-fiber wavelength conversion method. In the method, wavelength conversion is realized by using an 8-shaped optical fiber laser, namely an optical fiber laser of a non-linear optical fiber loop mirror. The optical fiber laser comprises a linear cavity and a non-linear cavity, wherein the linear cavity has a structure of a standard optical fiber laser loop cavity; the non-linear cavity has a structure of a non-linear optical fiber loop mirror; when a control signal light does not enter, the non-linear cavity does not have a transmission light, and the 8-shaped optical fiber laser does not start oscillation; and when the control signal light enters, the entering light controls the relative phases of two lights which are transmitted in opposite direction, so the transmission light is output, the 8-shaped optical fiber laser operates, and a wavelength selection device in the linear cavity converts a signal light wavelength to any one wavelength which is covered by a gain medium fluorescent light. The all-optical-fiber wavelength conversion method has the advantages of no influence of the signal light wavelength during the wavelength conversion, convenience for operation, high extinction ratio and high switching speed rate.
Description
Technical field
The present invention relates to the wavelength Conversion technical field, specifically describe a kind of communication band Wavelength conversion method of novel full optical fiber.
Background technology
The too busy to get away more originally network life of modern society people, people are increasing to the demand of the integrated service network of high-speed high capacity, and this will become development trend from now on.Fibre Optical Communication Technology and wavelength multiplexing (WDM) network makes the capacity of point-to-point transmission be greatly improved for the network of this high-speed high capacity provides strong technical support.The WDM network is exactly to utilize different wavelength to transmit in same channel to increase the utilization factor of channel, improve the transmission quantity of information of channel, therefore be unusual important resource at such system's medium wavelength, how improve wavelength utilization factor in the optical-fiber network effectively and be the major issue in the WDM optical-fiber network.If there is not Wavelength conversion method in such network, set up a connection between two nodes so, all link sections of process must use same wavelength on its path, if there is other connection need use wherein this wavelength of certain link section, then the wavelength blocker phenomenon can take place.Then for avoiding this obstruction that a kind of feasible solution is provided, it to other idle wavelength available, need not wait conversion of signals Wavelength conversion method, can improve the wavelength utilization factor like this, increases the transmission capacity of network.Because this point-to-point transmission has randomness, adopt Wavelength conversion method, their wavelength on link are not fixed, and the wavelength number that participates in wavelength-division multiplex is reduced, reducing the wavelength blocker rate in the network greatly, is that network construction, subnet management have more dirigibility with compatible.
At present the All Optical Wavelength Conversion scheme of research has all been utilized the various nonlinear effects in the nonlinear medium, as cross-gain modulation, cross-phase modulation, four-wave mixing with based on the wavelength Conversion of difference frequency etc.Based on the wavelength shifter of cross-gain modulation is the gain saturation characteristic work that utilizes semiconductor optical amplifier, be simple proposal, but extinction ratio is asymmetric, warbles and noise is unfavorable for transmission greatly.The quality height of the wavelength shifter conversion of cross-phase modulation, switching rate is fast, but the structure relative complex.Four-wave mixing and can realize multi channel conversion simultaneously based on the wavelength shifter of difference frequency, but because existing device immature, conversion efficiency is very low, and to signal polarization state of light sensitivity.
Summary of the invention
The objective of the invention is the deficiency at above-mentioned existing method, designed a kind of Wavelength conversion method of novel full optical fiber, this method Wavelength-converting is not subjected to the influence of signal light wavelength, handled easily, and the extinction ratio height, switching rate is fast.
The object of the present invention is achieved like this:
A kind of Wavelength conversion method of full optical fiber, it is the fiber laser of nonlinear optical fiber annular mirror that this method of characteristics formula adopts " 8 " font fiber laser, realize wavelength Conversion, this fiber laser comprises linear cavity and non-linear chamber, its linear cavity is a standard fiber laser instrument ring cavity structure, comprises gain media, wavelength selection, isolator, output unit and the fiber optic splitter that combines with non-linear chamber; Non-linear chamber is a nonlinear optical fiber annular mirror structure, comprises that gain media, single-mode fiber, injection light beam go into device; When control signal light did not inject, non-linear chamber did not have transmitted light, the not starting of oscillation of " 8 " font fiber laser; When flashlight injects, relative phase by the light that injects photocontrol two bundle reverse direction transmission, make transmitted light export, the running of " 8 " font fiber laser, the wavelength selection system in the linear cavity forwards signal light wavelength to arbitrary wavelength that gain media fluorescence is covered.
The present invention is based on the nonlinear effect of " 8 " word cavity configuration, utilize the starting of oscillation of outside flashlight control fiber laser, wavelength selection system is arranged in the laser instrument, realize wavelength Conversion.So-called " 8 " word cavity optical fibre laser just has been to use the fiber laser of nonlinear optical fiber annular mirror (Sagnac interferometer), because the shape in chamber is commonly called figure of eight laser instrument.
Two output ports of fiber coupler are coupled together form a ring, just can constitute the Sagnac interferometer.The input light field will be divided into the two-beam that transmits in opposite direction, be respectively the forward-wave of transmission clockwise and the retonation wave that transmits counterclockwise.Coupling mechanism has been introduced the phase shift of pi/2 to retonation wave, and after once coming and going, two light fields have not only obtained linear phase shift, but also has obtained the nonlinear phase shift introduced from phase modulation (PM) and cross-phase modulation.The light path of two-beam is identical and coherent interference takes place in coupling mechanism, and the relative phase between them has determined input light to be reflected in the Sagnac interferometer or transmission.
In ring, introduce the switching threshold that fiber amplifier can reduce the Sagnac interferometer.Amplifier is placed near coupling mechanism, and two pulses of transmitting are not in opposite directions amplified simultaneously, have therefore introduced asymmetric property, and promptly amplifier has destroyed the balance of Sagnac interferometer.Can understand like this: owing to one of them ripple is exaggerated at the inlet of fiber optic loop, and the light of reverse transfer is exaggerated in the outlet of fiber optic loop just, so the intensity of two-beam just differs greatly in the whole ring, differential phase shift is also very big.If so originally the light that all is reflected will be gone out in some transmission, original transmission port just has light output.If control signal is arranged in the Sagnac to be injected and during along a certain direction transmission, can be to certain a branch of generation nonlinear phase shift in the two-beam of reverse transfer, and another Shu Guang is unaffected, say it also has been the balance of Sagnac interferometer of having utilized the control photo damage in essence, original like this light of all going out from reflector port also can some be gone out from the transmission port.By changing the length of control light intensity and Sagnac interferometer, can control the ratio of transmitted light.
Among the present invention, the non-linear cavity segment of " 8 " word cavity configuration can be regarded a Sagnac interferometer as, by the relative phase of the light that injects flashlight control two bundle reverse direction transmission, the size of control transmitted light.The left side in " 8 " word chamber is a linear cavity, it is exactly the structure of general ring cavity, pump light is injected into by WDM and produces fluorescence in the Er-doped fiber, isolator is used for controlling the direction of linear cavity, because in non-linear chamber, only be divided into two forward and reverse transmitted in both directions of part, but in linear cavity in order to guarantee that transmitted light does not influence the running of laser instrument, the rotation direction that needs isolator control laser instrument makes the transmitted light of Sagnac interferometer become the key that promotes laser operation.
Realization of the present invention is finished by following scheme:
Be injected into by flashlight in the non-linear chamber in " 8 " word chamber, the transmission end is not had light to become light is arranged by original, the linear cavity in 8 word chambeies is partly turned round, and Fiber Bragg Grating FBG is selected as wavelength, signal light wavelength can be forwarded to any wavelength that Er-doped fiber fluorescence is covered.
Advantage of the present invention is an all optical fibre structure, and Wavelength-converting is not subjected to the influence of signal light wavelength, handled easily, and the extinction ratio height, switching rate is fast.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is a structural representation of the present invention.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that personnel's of the same trade understanding.
Embodiment
Consult accompanying drawing 2, sequence number is represented respectively among the figure: 1, the wavelength division multiplexer of 11-980 nanometer and 1550 nanometers, bandwidth 30 nanometers; 2,10-erbium-doped single-mode fiber; 50: 50 optical fiber coupling beam dividers of 3-centre wavelength 1550 nanometers; The 4-bragg grating, centre wavelength 1557.6 nanometers, bandwidth 0.6 nanometer; 90: 10 optical fiber coupling beam divider of 5-centre wavelength 1550 nanometers, 10% as output terminal; The fibre optic isolater of 6-centre wavelength 1550 nanometer polarization irrelevants; The 7-optical fiber polarization controller; 8, near the dense wave division multiplexer the 12-1550 nanometer, wavelength is respectively 1549.3 nanometers and 1557.6 nanometers; The 9-general single mode fiber.
In the present embodiment, use atypical " 8 " word chamber of nonlinear optical fiber annular lens device erbium doped fiber laser to form, utilize one 50: 50 fiber coupler 3 can form " a 8 " word cavity configuration, the left side is the linear segment in Eight characters chamber, 980 Nano semiconductor laser instruments are injected in the erbium ion-doped optical fiber by WDM1 as pump light, the erbium ion pumping to last energy level, is produced fluorescence.Fluorescence is divided into forward and oppositely enters the non-linear partial in 8 word chambeies from a port of fiber coupler 3, also can be understood as the Sagnac ring, the light that changes is earlier through non-linear amplifier counterclockwise, clockwise behind the light that changes through non-linear amplifier, the splitting ratio of adding fiber coupler may be slightly variant, therefore their nonlinear phase shifts of coming and going in non-linear chamber behind the circle are unequal certainly, have fluorescence from another port of coupling mechanism and appear.Can control the Polarization Controller in the non-linear chamber, make the nonlinear phase shift of two-beam in output port place phase difference of pi, two-beam is interfered and is disappeared mutually, does not have transmittance.Corresponding light will all reflect back from the incident end, because the existence of isolator can not form loop the linear cavity of on the left side from the light that the incident end reflects back.When weak signal light is injected in the non-linear chamber by dense wave division multiplexer (DWDM) 12, at first flashlight is amplified through a non-linear amplifier, according to the introduction of front, the control light after this has amplified can be to a branch of generation nonlinear phase shift wherein, and another Shu Buhui is influential.Original like this situation about disappearing mutually in the interference of transmission end will change, and the linear cavity on the left side just can starting of oscillation, forms laser output.In case outside flashlight has not had, nonlinear phase shift can become original situation again, and the transmission port does not have light, not starting of oscillation of laser instrument, and the variation with flashlight that can control output light by this process changes.DWDM8 in the non-linear chamber is used for flashlight output, in order to avoid influence the injection of next signal light.Form a nonlinear optical fiber amplifier by WDM11 and one section Er-doped fiber 10 and be used for the amplifying signal light pulse, also increased differential phase shift on the other hand; Single-mode fiber is used to increase the asymmetry in non-linear chamber, and the length that has increased non-linear chamber has also just increased nonlinear phase shift.Bragg grating in the linear cavity is used to export light wavelength to be selected, and the scope of exporting light like this can cover the emission spectrum scope of whole erbium ion, just in time is the window wave band of optical fiber communication.
Control light here and light signal light all are selected near 1550 nm, and on the one hand because 1550 nm light have in real life very widely to be used, near the optical fibre device 1550 nm is ripe relatively on the other hand, and differential loss is also smaller.
Claims (1)
1. the Wavelength conversion method of a full optical fiber, it is characterized in that it is the fiber laser of nonlinear optical fiber annular mirror that this method adopts " 8 " font fiber laser, realize wavelength Conversion, this fiber laser comprises linear cavity and non-linear chamber, its linear cavity is a standard fiber laser instrument ring cavity structure, comprises gain media, wavelength selection, isolator, output unit and the fiber optic splitter that combines with non-linear chamber; Non-linear chamber is a nonlinear optical fiber annular mirror structure, comprises that gain media, single-mode fiber, injection light beam go into device; When control signal light did not inject, non-linear chamber did not have transmitted light, the not starting of oscillation of " 8 " font fiber laser; When flashlight injects, relative phase by the light that injects photocontrol two bundle reverse direction transmission, make transmitted light export, the running of " 8 " font fiber laser, the wavelength selection system in the linear cavity forwards signal light wavelength to arbitrary wavelength that gain media fluorescence is covered.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346462A (en) * | 2013-06-24 | 2013-10-09 | 天津理工大学 | Passive mode-locking optical fiber laser based on nonlinear optical fiber magnifying glass |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1909306A (en) * | 2006-09-01 | 2007-02-07 | 中国科学院西安光学精密机械研究所 | '8' character cavity passive mode-locking pulse optical fibre laser |
| CN101546886A (en) * | 2009-02-03 | 2009-09-30 | 江西师范大学 | A 8-shaped multi-wavelength optical fibre laser |
| CN101606284A (en) * | 2006-11-16 | 2009-12-16 | Ofs飞泰尔公司 | Passively modelocked figure eight fiber laser |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1909306A (en) * | 2006-09-01 | 2007-02-07 | 中国科学院西安光学精密机械研究所 | '8' character cavity passive mode-locking pulse optical fibre laser |
| CN101606284A (en) * | 2006-11-16 | 2009-12-16 | Ofs飞泰尔公司 | Passively modelocked figure eight fiber laser |
| CN101546886A (en) * | 2009-02-03 | 2009-09-30 | 江西师范大学 | A 8-shaped multi-wavelength optical fibre laser |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346462A (en) * | 2013-06-24 | 2013-10-09 | 天津理工大学 | Passive mode-locking optical fiber laser based on nonlinear optical fiber magnifying glass |
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Application publication date: 20111116 |