CN101840031B - Light-operated dynamic all-optical buffer shaper based on composite grating nonreciprocal coupling - Google Patents
Light-operated dynamic all-optical buffer shaper based on composite grating nonreciprocal coupling Download PDFInfo
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- CN101840031B CN101840031B CN201010161660XA CN201010161660A CN101840031B CN 101840031 B CN101840031 B CN 101840031B CN 201010161660X A CN201010161660X A CN 201010161660XA CN 201010161660 A CN201010161660 A CN 201010161660A CN 101840031 B CN101840031 B CN 101840031B
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Abstract
The invention relates to a light-operated dynamic all-optical buffer shaper based on composite grating nonreciprocal coupling and the shaper is applicable to the fields such as the storage, control and treatment of high speed optical signals. The connection method for forming the element is as follows: optical signals to be cached are connected with the first port (511) of a first wavelength division multiplexer through a first opto-isolator (21), the third port (513) of the first wavelength division multiplexer connected with the first port (61) of a composite grating coupler; a first pump light source (31) is connected with the second port (512) of the first wavelength division multiplexer through a second opto-isolator (22); the second port (62) of the composite grating coupler is connected with the third port (63) of the composite grating coupler through single mode fibre to form a circular resonant cavity (7); and the fourth port (64) of the composite grating coupler is connected with a signal analyzer (4). The light-operated dynamic all-optical buffer shaper has simple structure and low cost, and can solve the current network congestion and reduce the network construction cost.
Description
Technical field
The present invention relates to a kind of light-operated dynamic all-optical buffer shaper, belong to the optical communication technique field, be particularly useful for fields such as storage, control, processing high-speed optical signal based on composite grating nonreciprocal coupling.
Background technology
Information Network is made up of transmission and exchange, hop has been finished by the revolution of electricity to light at present, but obviously unmatchedly with the vast capacity light transmission be, electron device is still adopted in information processing, be subject to the data processing speed of opto-electronic conversion and electron device, be easy to cause the congested of information network.In order effectively to improve the handling capacity of all-optical network node, avoid the network competition between different user, press for a kind of can effectively the delay or the device of buffer memory to input optical signal.Than traditional automatically controlled storer, light-operated full optical buffer all has remarkable advantages at aspects such as processing speed, access time, every bit energy consumption, cost, volumes, is acknowledged as the important support device to the intelligent all-optical network evolution of the next generation.
The transmission time of light signal is: τ=L/v
g, wherein L is the length of light path, v
gBe group velocity, therefore the design of light-operated full optical buffer mainly contains two kinds of thinkings: (1) prolongs the length of transmission path; (2) the slow down speed of light.Based on the full optical buffer that prolongs light transmission path the most normal employing be a kind of " switching delay line " structure, it postpones optical fiber by a series of 2 * 2 photoswitches and multistage and forms, by connecting different photoswitches, can carry out different delays to light signal on demand, but owing to there is not control function, the delay of signal can only preestablish by photoswitch, makes the range of application of this type light buffer be subjected to very big restriction.Present improvement project mainly is a design optical fiber feedback control loop, and as the double-ring coupled type full optical buffer based on 3 * 3 coupling mechanisms, but this buffer needs the dicyclo collaborative work, and the access code speed of signal is very low; The ring-like full optical buffer of another kind of high Q resonance, though improved the access rate of signal effectively, but it not only needs to have the complicated coupling control of time dependence, and each resonant ring can only be handled single-bit at every turn, the access of long data string must be adopted the mode of multi-ring array, and device size and cost all obviously improve.
For slowing light velocity, according to slowing factor the ratio of the group velocity of light reality (the light speed in a vacuum with):
Can be by the relative variation that increases refractive index n or increase refractive index
Realize that because the refractive index and the vacuum of generic media are more or less the same, it will be very limited relying on increase refractive index acquisition light speed reduction, so outlet can only be the relative variation that increases refractive index.Realize the effective method of this purpose: a kind of is to introduce defective in high chromatic dispersion two-dimensional waveguide photonic crystal, and by the design slowing light velocity of photon energy level band gap, but that it is connected with optical fiber communication is difficult, and higher insertion loss and polarization dependence are arranged.The electromagnetically induced that another kind is based on quantum coherence effect transparent (EIT) technology, but it need carry out under ultralow temperature (near absolute zero), and experimental system is too complicated, cost is expensive.In addition, people have also proposed to utilize broadband stimulated Brillouin scattering, excited Raman amplification or non-linear Bragg grating etc. to realize the scheme of light speed reduction, but these schemes still are in the theoretical analysis stage at present, but reach the degree of practicability far away.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiency that existing full optical buffer exposes on performance, application and cost, a kind of light-operated dynamic all-optical buffer shaper based on the composite grating nonreciprocal coupling is proposed, not only can under the pump light gain control, realize the buffer memory of light signal, can also carry out shaping light pulse.
Technical scheme of the present invention:
The present invention proposes a kind of light-operated dynamic all-optical buffer shaper based on the composite grating nonreciprocal coupling, comprise: treat that importation, the pump light of buffer memory light signal treat the buffer memory part of the control section of buffer memory light signal, light signal and the probe portion of light signal, the connection of described each several part is as follows:
A kind of light-operated dynamic all-optical buffer shaper based on the composite grating nonreciprocal coupling, this all-optical buffer shaper comprises, treats buffer memory light signal, composite grating coupling mechanism, ring resonator, first optoisolator, second optoisolator, first pump light source, first wavelength division multiplexer and optical signal analyzer; It constitutes the connection of device:
Treat that the buffer memory light signal links to each other with first port of first wavelength division multiplexer by first optoisolator, the 3rd port of first wavelength division multiplexer is connected with first port of composite grating coupling mechanism, constitutes the importation of light signal;
First pump light source links to each other with second port of first wavelength division multiplexer by second optoisolator, constitutes the control section for the treatment of the buffer memory light signal;
Second port of composite grating coupling mechanism is linked to be ring resonator by the 3rd port of single-mode fiber and composite grating coupling mechanism, constitutes the buffer memory part of light signal;
The 4th port of composite grating coupling mechanism links to each other with signal analyzer, constitutes the probe portion of light signal;
The buffer memory part of the importation of described light signal, the control section for the treatment of the buffer memory light signal, light signal, the probe portion of light signal, the light-operated dynamic all-optical buffer shaper of formation forward direction pump mode.
The light-operated dynamic all-optical buffer shaper based on the composite grating nonreciprocal coupling that the present invention proposes, its working method is: by injecting pump light, produce gain control along the grating coupled zone, thereby constitute refractive index and gain complex modulated grating coupler.When pump light is opened, this device shows nonreciprocal power transfer characteristic, the light signal cross-couplings that first port of composite grating coupling mechanism can be imported is to the 3rd port of composite grating coupling mechanism, but the signal to second port of composite grating coupling mechanism can only lead directly to, forbid that its cross over transition outputs to the 4th port of composite grating coupling mechanism, thereby input optical signal is stored in ring resonator; After closing pump light, this device recovers reciprocity property, all can realize intersecting power transfer to the 4th port of composite grating coupling mechanism, thereby extract buffer memory light signal to the 3rd port of composite grating coupling mechanism, second port of composite grating coupling mechanism from first port of composite grating coupling mechanism.In addition, the nonlinear effect that pump light is introduced in the composite grating coupling mechanism also has shaping operation to signal pulse.
Beneficial effect of the present invention is specific as follows:
The present invention proposes a kind of light-operated dynamic all-optical buffer shaper based on the composite grating nonreciprocal coupling, make full use of dissipation optics space-time nonreciprocity, by the gain control mode that pump light produces, make of the integrated processing of composite grating coupling mechanism and ring resonator formation to storage, shaping and the extraction of light signal.This light-operated dynamic all-optical buffer shaper is simple in structure, with low cost, to solving present network congestion, reduce the network struction cost, promoting all optical network development and will have important economy and social effect.
Description of drawings
The structural drawing based on the dynamic all-optical buffer shaper of composite grating nonreciprocal coupling of Fig. 1 forward direction pump mode.
The structural drawing based on the dynamic all-optical buffer shaper of composite grating nonreciprocal coupling of Fig. 2 backward pump mode.
The structural drawing based on the dynamic all-optical buffer shaper of composite grating nonreciprocal coupling of Fig. 3 two directional pump mode.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
As Fig. 1, a kind of dynamic all-optical buffer shaper of forward direction pump mode based on the composite grating nonreciprocal coupling, it constitutes the connection between each parts:
This all-optical buffer shaper comprises, treats buffer memory light signal 1, composite grating coupling mechanism 6, ring resonator 7, first optoisolator 21, second optoisolator 22, first pump light source 31, first wavelength division multiplexer 51 and optical signal analyzer 4; It constitutes the connection of device:
Treat that buffer memory light signal 1 links to each other with first port 511 of first wavelength division multiplexer by first optoisolator 21, the 3rd port 513 of first wavelength division multiplexer is connected with first port 61 of composite grating coupling mechanism, constitutes the importation of light signal.
First pump light source 31 links to each other with second port 512 of first wavelength division multiplexer by second optoisolator 22, constitutes the control section for the treatment of the buffer memory light signal.
The 4th port 64 of composite grating coupling mechanism links to each other with signal analyzer 4, constitutes the probe portion of light signal.
The buffer memory part of the importation of described light signal, the control section for the treatment of the buffer memory light signal, light signal, the probe portion of light signal, the light-operated dynamic all-optical buffer shaper of formation forward direction pump mode.
Embodiment two
As Fig. 2, a kind of dynamic all-optical buffer shaper of backward pump mode based on the composite grating nonreciprocal coupling, it constitutes the connection between each parts:
This all-optical buffer shaper comprises, treats buffer memory light signal 1, optical signal analyzer 4, composite grating coupling mechanism 6, ring resonator 7, first optoisolator 21, the 3rd optoisolator 23, second pump light source 32 and second wavelength division multiplexer 52; It constitutes the connection of device:
Treat that buffer memory light signal 1 is connected with first port 61 of composite grating coupling mechanism by first optoisolator 21, constitutes the importation of light signal;
The 4th port 64 of composite grating coupling mechanism is connected with first port 521 of second wavelength division multiplexer, and the 3rd port 523 of second wavelength division multiplexer links to each other with signal analyzer 4, constitutes the probe portion of light signal;
The importation of described light signal, the buffer memory of described light signal part, the described control section of buffer memory light signal and the probe portion of described light signal treated, the backward pump mode of formation light-operated dynamic all-optical buffer shaper.
Embodiment three
As Fig. 3, this all-optical buffer shaper comprises, treats buffer memory light signal 1, optical signal analyzer 4, composite grating coupling mechanism 6, ring resonator 7, first optoisolator 21, second optoisolator 22, the 3rd optoisolator 23, first pump light source 31, second pump light source 32, first wavelength division multiplexer 51 and second wavelength division multiplexer 52.
It constitutes the connection of device and the difference of embodiment one is:
The 4th port 64 of composite grating coupling mechanism is connected with first port 521 of second wavelength division multiplexer, and the 3rd port 523 of second wavelength division multiplexer links to each other with signal analyzer 4, constitutes the probe portion of light signal;
Forward direction and back constitute the light-operated dynamic all-optical buffer shaper of two directional pump mode to common pumping.
Described composite grating coupling mechanism 6 is the gain-type composite grating coupling mechanism that index modulation and pump light source gain modulation form, or the loss-type composite grating coupling mechanism of index modulation and periodicity microbending loss modulation formation, and other has the periodically composite grating coupling mechanism of complex modulation fuction.
Described composite grating coupling mechanism 6 is realized the flexible conversion between nonreciprocal coupled characteristic and the reciprocity coupled characteristic under first pump light source 31,32 controls of second pump light source.
Described first and second wavelength division multiplexers (51,52) adopt 980/1550 wavelength division multiplexer.
Described first optoisolator 21 adopts optoisolator, second optoisolator 22 and the 3rd optoisolator 23 of 1550nm wave band to adopt the optoisolator of 980nm wave band.
The described buffer memory light signal 1 for the treatment of is the high-speed optical signal that transmits in optical communication and the optical-fiber network.
Described optical signal analyzer 4 adopts the 40G of Agilent company or the optical signal analyzer of other higher processing speed.
Claims (3)
1. light-operated dynamic all-optical buffer shaper based on composite grating nonreciprocal coupling, it is characterized in that, this all-optical buffer shaper comprises, treats buffer memory light signal (1), composite grating coupling mechanism (6), ring resonator (7), first optoisolator (21), second optoisolator (22), first pump light source (31), first wavelength division multiplexer (51) and optical signal analyzer (4); It constitutes the connection of device:
Treat that buffer memory light signal (1) links to each other with first port (511) of first wavelength division multiplexer by first optoisolator (21), the 3rd port (513) of first wavelength division multiplexer is connected with first port (61) of composite grating coupling mechanism, constitutes the importation of light signal;
First pump light source (31) links to each other with second port (512) of first wavelength division multiplexer by second optoisolator (22), constitutes the control section for the treatment of the buffer memory light signal;
Second port (62) of composite grating coupling mechanism is linked to be ring resonator (7) by the 3rd port (63) of single-mode fiber and composite grating coupling mechanism, constitutes the buffer memory part of light signal;
The 4th port (64) of composite grating coupling mechanism links to each other with signal analyzer (4), constitutes the probe portion of light signal;
The buffer memory part of the importation of described light signal, the control section for the treatment of the buffer memory light signal, light signal, the probe portion of light signal, the light-operated dynamic all-optical buffer shaper of formation forward direction pump mode;
The probe portion of described light signal is: the 4th port (64) of composite grating coupling mechanism is connected with first port (521) of second wavelength division multiplexer, and the 3rd port (523) of second wavelength division multiplexer links to each other with signal analyzer (4);
The described control section of buffer memory light signal for the treatment of is: second port (522) of second wavelength division multiplexer is connected with second pump light source (32) through the 3rd optoisolator (23);
The importation of described light signal is: treat that buffer memory light signal (1) is connected with first port (61) of composite grating coupling mechanism by first optoisolator (21);
The importation of described light signal, the buffer memory of described light signal part, the described control section of buffer memory light signal and the probe portion of described light signal treated, the backward pump mode of formation light-operated dynamic all-optical buffer shaper;
Forward direction and back constitute the light-operated dynamic all-optical buffer shaper of two directional pump mode to common pumping.
2. a kind of light-operated dynamic all-optical buffer shaper according to claim 1 based on the composite grating nonreciprocal coupling, it is characterized in that, described composite grating coupling mechanism (6) is the gain-type composite grating coupling mechanism that index modulation and pump light source gain modulation form, or the loss-type composite grating coupling mechanism of index modulation and periodicity microbending loss modulation formation, or has the periodically composite grating coupling mechanism of complex modulation fuction.
3. a kind of light-operated dynamic all-optical buffer shaper according to claim 1 based on the composite grating nonreciprocal coupling, it is characterized in that, described composite grating coupling mechanism (6) is realized the flexible conversion between nonreciprocal coupled characteristic and the reciprocity coupled characteristic under first pump light source (31), second pump light source (32) control.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102411986B (en) * | 2011-10-12 | 2013-09-25 | 清华大学 | Optical temporary register |
| CN104977733B (en) * | 2015-05-12 | 2021-09-14 | 桂林 | Silicon-based nonreciprocal device structure and electric control nonreciprocal implementation method |
| CN105515665B (en) * | 2015-11-26 | 2017-08-25 | 西南交通大学 | Full optical buffer based on excited Brillouin gain polarization characteristic |
| CN106685533B (en) * | 2017-03-01 | 2020-12-15 | 北方工业大学 | Tunable optical pulse buffer |
| CN107817557B (en) * | 2017-12-17 | 2019-06-28 | 华中科技大学 | A kind of non-reciprocal device of all -fiber and preparation method thereof |
| CN112423163B (en) * | 2020-10-12 | 2023-03-14 | 江西师范大学 | Optical buffer based on coherent feedback |
| CN113193917A (en) * | 2021-05-08 | 2021-07-30 | 北方工业大学 | All-optical buffer capable of extracting multi-wavelength optical signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101145852A (en) * | 2007-11-01 | 2008-03-19 | 上海交通大学 | High-power optical fiber Brillouin amplifier for full optical buffer |
| CN101262709A (en) * | 2008-04-11 | 2008-09-10 | 华中科技大学 | A full optical buffer based on proton crystal optical fiber |
| CN101572375A (en) * | 2009-04-30 | 2009-11-04 | 天津理工大学 | Device utilizing single longitudinal mode dual wavelength fibre laser to generate microwave and millimeter wave |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145852A (en) * | 2007-11-01 | 2008-03-19 | 上海交通大学 | High-power optical fiber Brillouin amplifier for full optical buffer |
| CN101262709A (en) * | 2008-04-11 | 2008-09-10 | 华中科技大学 | A full optical buffer based on proton crystal optical fiber |
| CN101572375A (en) * | 2009-04-30 | 2009-11-04 | 天津理工大学 | Device utilizing single longitudinal mode dual wavelength fibre laser to generate microwave and millimeter wave |
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