CN202126559U - All optical wavelength converter of annular cavity multi-wavelength laser based on photonic crystal fiber (PCF) - Google Patents
All optical wavelength converter of annular cavity multi-wavelength laser based on photonic crystal fiber (PCF) Download PDFInfo
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- CN202126559U CN202126559U CN2011202375600U CN201120237560U CN202126559U CN 202126559 U CN202126559 U CN 202126559U CN 2011202375600 U CN2011202375600 U CN 2011202375600U CN 201120237560 U CN201120237560 U CN 201120237560U CN 202126559 U CN202126559 U CN 202126559U
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Abstract
The utility model discloses an all optical wavelength converter of an annular cavity multi-wavelength laser based on photonic crystal fiber (PCF). First pump light and second pump light are coupled through a first coupler, pass through a first wavelength division multiplexer and enter an er-doped fiber. Amplified spontaneous emission light generated in the er-doped fiber passes through a photonic crystal fiber and a second coupler and reaches to an array waveguide grate in counter-clockwise direction, the amplified spontaneous emission light is divided into optical channels with different wavelengths by the array waveguide grate, an optical switch can select the light of one channel as pump light and signal wavelength division multiplex, and then the amplified spontaneous emission light passes through a separator, the er-doped fiber and a first wavelength division multiplexer and enters the photonic crystal fiber to generate four-wave mixing. 20 percent of the mixed light is separated at the portion of the second coupler and continues to enter the annular cavity, and 80 percent of the mixed light serves as an output and enters a tunable bandpass filter to filter required transition light. The all optical wavelength converter of the annular cavity multi-wavelength laser based on PCF is simple in structure and low in cost and can be integrated with an optical fiber system easily.
Description
Technical field
The utility model belongs to the optical information technical field, relates to a kind of AOWC of the ring cavity multiple-wavelength laser based on PCF.
Background technology
Because the development of DWDM technology, become the developing direction of following vast capacity communication network based on the realization of the all-optical network of wavelength conversion and wavelength route, and the core component of realization wavelength route is exactly optical wavelength converter (AOWC).AOWC is meant without electric territory and handles, directly the device of information from a light wavelength conversion to another optical wavelength.Directly realize that in the light territory wavelength Conversion can overcome deficiencies such as the speed bottle-neck of electrical part in light-electricity-optical transponder unit, the transparency are low; For the wavelength contention problem that solves in the full Optical Transmission Network OTN, it is all significant to improve Wavelength reuse rate and network configuration flexibility etc.The wavelength Conversion technology has been disperseed network management simultaneously, has improved security.
AOWC has a variety of implementation methods.From the basic physical principle that is adopted, generally be second order nonlinear effect and the third-order non-linear effect of having utilized optical medium.The difference frequency wavelength shifter utilizes second order nonlinear effect, and the four-wave mixing AOWC has utilized third-order nonlinear optical effect.In traditional silica fibre, third-order non-linear process efficient with respect to the second nonlinear process is lower, and the application of the four-wave mixing wavelength converter that traditional silica fibre is formed is limited.Yet; Traditional relatively silica fibre; Photonic crystal fiber can provide good nonlinear effect through the rational structure setting; In addition, traditional fiber is only supported single mode transport in a frequency range, and photonic crystal fiber then can be designed in whole frequency range, support single mode transport.Through reasonable structural design, photonic crystal fiber can be provided with chromatic dispersion and chromatic dispersion gradient flexibly, and broadband chromatic dispersion compensation is provided.Simultaneously, photonic crystal fiber is also felt has good birefringence effect and less bending loss.The four-wave mixing wavelength converter of being made up of photonic crystal fiber can improve good nonlinear effect, can improve the third-order non-linear effect, improves the efficient of four-wave mixing process.
Pump light all is to adopt the laser instrument output of fixed wave length to produce in traditional wavelength Conversion scheme, can know according to the wavelength Conversion mechanism of four-wave mixing, changes the tuning range that the pumping light wavelength can increase wavelength Conversion.Erbium optical fiber belongs to the gain HOMOGENEOUS BROADENING MEDIUM in the erbium doped fiber laser; The lasing mode competition that is caused by HOMOGENEOUS BROADENING mechanism helps the single longitudinal mode of laser instrument to turn round; But in the erbium doped fiber laser of linear cavity; The effects of spatial that standing wave causes can make laser instrument produce multimode oscillation; Erbium doped fiber laser is designed to the structure of ring cavity, can effectively suppresses the effects of spatial of EDF, adding in ring cavity that AWG, wave filter and photoswitch can be implemented in switches the pumping light wavelength between system's different channels; Multi-wavelength circular cavity optic fibre laser with lambda switch function can be realized the pump light wavelength change, has increased wavelength tuning range.
Summary of the invention
The utility model to existing AOWC have expensive, to deficiencies such as modulating speed and modulation system are opaque; A kind of AOWC based on the ring cavity multiple-wavelength laser has been proposed; The convert light of utilizing the utility model to obtain has advantages such as stability is strong, the broadband is adjustable; The cost of whole device is low, and is easy to fibre system integrated.
The technical scheme that the utility model is taked:
Based on the AOWC of the ring cavity multiple-wavelength laser of PCF, it is made up of pumping source, Er-doped fiber, photonic crystal fiber, array waveguide grating, isolator, Polarization Controller, coupling mechanism, BPF., photoswitch etc.First pump light is connected with the input port a of first wavelength division multiplexer through first coupling mechanism coupling back with second pump light; Another input port b of first wavelength division multiplexer links to each other with an end of photonic crystal fiber; The other end of photonic crystal fiber is connected with the public input end of second coupling mechanism; The output port of 20% splitting ratio of second coupling mechanism is connected with the input end of
array waveguide grating; N the output port of
array waveguide grating is connected with N the input port of
photoswitch respectively;
output terminal of photoswitch links to each other with an end of first Polarization Controller, and the other end of first Polarization Controller is connected with an input end c of second wavelength division multiplexer.Input signal light is from the end input of second Polarization Controller; The other end of second Polarization Controller is connected with another input end d of second wavelength division multiplexer; The common port of second wavelength division multiplexer is connected with the input end of isolator; The output terminal of isolator is connected with an end of Er-doped fiber, and the other end of Er-doped fiber is connected with the common port of first wavelength division multiplexer.As above connect, first wavelength division multiplexer, photonic crystal fiber, second coupling mechanism,
array waveguide grating,
photoswitch, first Polarization Controller, second wavelength division multiplexer, isolator and Er-doped fiber have been connected to form ring cavity.80% output port of second coupling mechanism is connected with the input end of variable band-pass filter, the convert light that just can obtain exporting from the output port of variable band-pass filter.
Regulate first Polarization Controller or second Polarization Controller, the polarization direction of control pump light and flashlight when the polarization direction of two-beam is parallel, obtains maximum conversion efficiency.
Regulate photoswitch, make the different passage of array waveguide grating, realize different pumping wavelength outputs, produce different convert light wavelength output with fixed wave length flashlight generation four-wave mixing to being linked in the ring cavity.
Between the Er-doped fiber and second wavelength division multiplexer, add an isolator, in order to ensure the one-way transmission of ring cavity.
The beneficial effect of the utility model: the starting point of the utility model is to utilize the four-wave mixing of photonic crystal fiber to carry out All Optical Wavelength Conversion; Do not use fixed laser light source input pumping light; But replace input pumping light with the ring cavity multiple-wavelength laser, make this structure can realize full light adjustable wide-band wavelength Conversion again.The utility model is simple in structure, and cost is low, is easy to fibre system integratedly, and through regulating photoswitch, the pump light of choosing different wavelengths gets into ring cavity, thereby finally realizes the output of the convert light of different wave length.
The convert light good stability that the utility model obtains, wavelength-tunable has high cost performance, the transmitting photo-signal extinction ratio that is obtained, signal to noise ratio (S/N ratio) and error performance are all better.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
As shown in Figure 1, form by the first pumping source 1-1, the second pumping source 1-2, the first coupling mechanism 2-1, the second coupling mechanism 2-2, the first wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2, Er-doped fiber 4, the first Polarization Controller 5-1, the second Polarization Controller 5-2, photoswitch 6, array waveguide grating 7, variable band-pass filter 8, photonic crystal fiber 9, isolator 10 based on the AOWC of the ring cavity multiple-wavelength laser of PCF.It is connected to: the first pump light 1-1 is connected with the input port a of the first wavelength division multiplexer 3-1 through first coupling mechanism 2-1 coupling back with the second pump light 1-2; Another input port b of the first wavelength division multiplexer 3-1 links to each other with an end of photonic crystal fiber 9; The other end of photonic crystal fiber 9 is connected with the public input end of the second coupling mechanism 2-2; The output port of 20% splitting ratio of the second coupling mechanism 2-2 is connected with the input end of
array waveguide grating 7; N the output port of
array waveguide grating 7 is connected with N the input port of
photoswitch 6 respectively; The output terminal of
photoswitch 6 links to each other with the end of the first Polarization Controller 5-1, and the other end of the first Polarization Controller 5-1 is connected with the input end c of the second wavelength division multiplexer 3-2.Input signal light is from the end input of the second Polarization Controller 5-2; The other end of the second Polarization Controller 5-2 is connected with another input end d of the second wavelength division multiplexer 3-2; The common port of the second wavelength division multiplexer 3-2 is connected with the input end of isolator 10; The output terminal of isolator 10 is connected with an end of Er-doped fiber 4, and the other end of Er-doped fiber 4 is connected with the common port of the first wavelength division multiplexer 3-1.As above connect, the first wavelength division multiplexer 3-1, photonic crystal fiber 9, the second coupling mechanism 2-2,
array waveguide grating 7,
photoswitch 6, the first Polarization Controller 5-1, the second wavelength division multiplexer 3-2, isolator 10 and Er-doped fiber 4 have been connected to form ring cavity.80% the output port of the second coupling mechanism 2-2 is connected with the input end of variable band-pass filter 8, the convert light that just can obtain exporting from the output port of variable band-pass filter 8.
The first Polarization Controller 5-1 and the second Polarization Controller 5-2, the polarization direction of control pump light and flashlight when the polarization direction of two-beam is parallel, obtains maximum conversion efficiency.
Regulate photoswitch 6, make the different passage of array waveguide grating, realize different pumping wavelength outputs, produce different convert light wavelength output with fixed wave length flashlight generation four-wave mixing to being linked in the ring cavity.
Directly add an isolator at the Er-doped fiber 4 and the second wavelength division multiplexer 3-2, in order to ensure the one-way transmission of ring cavity.
Select the Er-doped fiber 4 of appropriate length, its length satisfies the required gain of generation multiwavelength laser under the effect of the first pump light 1-1, the second pump light 1-2.
Utilize the photonic crystal light 9 of appropriate length, make flashlight and pumping luminous energy in photonic crystal fiber 9, produce four-wave mixing, and obtain the convert light of maximum conversion efficiency.In order to reduce loss as much as possible, the tie point of each device directly is welded together in the ring cavity, chooses the second coupling mechanism 2-2 of 80:20, makes it can make output power maximum again for laser cavity provides enough feedbacks.Utilize photoswitch 6 to select the different passages of array waveguide grating 7, make the pump light of different wave length get into ring cavity.Utilize isolator 10 to confirm the optical transmission direction of ring cavity.
The utility model can obtain the adjustable transmitting photo-signal in broadband, and the conversion efficiency of its acquisition mainly receives restrictions such as pumping light power, signal light power, length of ring cavity.Along with the development of various photoelectric devices, will obtain more stable, wideer adjustable wide-band, the convert light of bigger conversion efficiency, and its application will be more extensive also.
Claims (1)
1. based on the AOWC of the ring cavity multiple-wavelength laser of PCF; Comprise pumping source, Er-doped fiber, photonic crystal fiber, array waveguide grating, isolator, Polarization Controller, coupling mechanism, BPF. and photoswitch; It is characterized in that: first pump light is connected with the input port a of first wavelength division multiplexer through first coupling mechanism coupling back with second pump light; Another input port b of first wavelength division multiplexer links to each other with an end of photonic crystal fiber; The other end of photonic crystal fiber is connected with the public input end of second coupling mechanism; The output port of 20% splitting ratio of second coupling mechanism is connected with the input end of
array waveguide grating; N the output port of
array waveguide grating is connected with N the input port of
photoswitch respectively;
output terminal of photoswitch links to each other with an end of first Polarization Controller, and the other end of first Polarization Controller is connected with an input end c of second wavelength division multiplexer; Input signal light is from the end input of second Polarization Controller; The other end of second Polarization Controller is connected with another input end d of second wavelength division multiplexer; The common port of second wavelength division multiplexer is connected with the input end of isolator; The output terminal of isolator is connected with an end of Er-doped fiber, and the other end of Er-doped fiber is connected with the common port of first wavelength division multiplexer;
Described first wavelength division multiplexer; Photonic crystal fiber; Second coupling mechanism;
array waveguide grating;
photoswitch; First Polarization Controller; Second wavelength division multiplexer; Isolator and Er-doped fiber have been connected to form ring cavity;
80% output port of second coupling mechanism is connected with the input end of BPF., the convert light that just can obtain exporting from the output port of BPF..
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202375600U CN202126559U (en) | 2011-07-07 | 2011-07-07 | All optical wavelength converter of annular cavity multi-wavelength laser based on photonic crystal fiber (PCF) |
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| CN2011202375600U CN202126559U (en) | 2011-07-07 | 2011-07-07 | All optical wavelength converter of annular cavity multi-wavelength laser based on photonic crystal fiber (PCF) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777697A (en) * | 2015-04-21 | 2015-07-15 | 电子科技大学 | Optical frequency comb generator for random polarization feedback system |
| CN104297854B (en) * | 2014-11-05 | 2017-11-07 | 武汉邮电科学研究院 | Silicon substrate multi wave length illuminating source and its method for realization |
| CN114337837A (en) * | 2021-11-26 | 2022-04-12 | 军事科学院系统工程研究院网络信息研究所 | Wavelength programmable multifunctional microwave photon signal processing method |
-
2011
- 2011-07-07 CN CN2011202375600U patent/CN202126559U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297854B (en) * | 2014-11-05 | 2017-11-07 | 武汉邮电科学研究院 | Silicon substrate multi wave length illuminating source and its method for realization |
| CN104777697A (en) * | 2015-04-21 | 2015-07-15 | 电子科技大学 | Optical frequency comb generator for random polarization feedback system |
| CN114337837A (en) * | 2021-11-26 | 2022-04-12 | 军事科学院系统工程研究院网络信息研究所 | Wavelength programmable multifunctional microwave photon signal processing method |
| CN114337837B (en) * | 2021-11-26 | 2023-11-14 | 军事科学院系统工程研究院网络信息研究所 | Wavelength programmable multifunctional microwave photon signal processing method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20140707 |
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| EXPY | Termination of patent right or utility model |