CN107643610B - Full optical modulator and its operating method - Google Patents
Full optical modulator and its operating method Download PDFInfo
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- CN107643610B CN107643610B CN201711124536.4A CN201711124536A CN107643610B CN 107643610 B CN107643610 B CN 107643610B CN 201711124536 A CN201711124536 A CN 201711124536A CN 107643610 B CN107643610 B CN 107643610B
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- division multiplexer
- polarization controller
- optical fiber
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Abstract
A kind of full optic modulating device and its operating method, full optical modulator includes the first wavelength division multiplexer, the first Polarization Controller, optical fiber connector, the second wavelength division multiplexer, the second Polarization Controller and the polarizer, the optical fiber connector is the optical fiber connector for being clamped with tungsten sulfide water-soluble film, and first wavelength division multiplexer, the first Polarization Controller, optical fiber connector, the second wavelength division multiplexer, the second Polarization Controller and the polarizer are sequentially connected by single mode optical fiber.The present invention uses tungsten sulfide-PVA film with thickness change, and realizes full light modulation in conjunction with the method for polarization interference volume in optical fiber, which is a kind of compatible fibre system, with low cost, compact-sized full optic modulating device.
Description
Technical field
The present invention relates to the full optical modulator of optical signal, especially a kind of full optical modulator and its operating method.
Background technique
Transient metal sulfide is a kind of nano material with two-dimensional layered structure, there is electrical and optical property outstanding
Can, the extensive concern by researchers at home and abroad.The one kind of tungsten sulfide as transient metal sulfide, is proven to have high
Optical nonlinearity and stronger saturated absorption characteristic.Q-switched laser and mode-locked laser based on tungsten sulfide as saturated absorbing body
The research of device is also successively reported.Therefore tungsten sulfide has extensively in fields such as pulse laser, nonlinear optical fiber, optical signal prosessings
General application prospect.
On the other hand, all-optical signal processing has many advantages, such as electromagnetism interference because of it and easily connect with other optical devices in light
It plays an important role in communication.Full optical modulator has obtained grinding extensively as one of all-optical signal processing basic device
Study carefully.The scheme of the full optical modulator registered mainly include the following types:
Method 1: the full optical modulator based on nonlinear optical fiber Kerr nonlinearity.By utilizing the Ke Er in nonlinear optical fiber
The light light such as non-linear realization Cross-phase Modulation interaction, to realize all-optical signal processing.But nonlinear optical fiber cost compared with
Height, and longer fiber lengths are needed, volume is also larger.
Method 2: the full optical modulator of the carrier properties based on semiconductor optical amplifier.By utilizing semiconductor optical amplification
The interaction of light light is realized in modulation of cross-intensity caused by carrier etc. in device, realizes all-optical signal processing.But semiconductor light is put
Big device is at high cost, and technique is also more complex.
Method 3: the full optical modulator based on graphene thermal luminous effect.It is absorbed heat using graphene and changes the spy of medium refraction index
Property realize the crossmodulation of luminous intensity or light phase, realize all-optical signal processing.But graphene to the absorption of different wave length almost
It is identical, cause control efficiency limited.
In short, above several method or higher cost or volume is larger or complex process or efficiency not
It is high.Therefore, it is necessary to a kind of methods to realize light field and light field while taking into account cost, volume, technique and control efficiency
Interaction.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned the deficiencies in the prior art, a kind of full optical modulator and its operating method are provided,
The device uses tungsten sulfide-PVA film with thickness change, and realizes full light in conjunction with the method for polarization interference volume in optical fiber
Modulation, the device are a kind of compatible fibre systems, with low cost, compact-sized full optic modulating device.
To solve the above-mentioned problems, technical solution of the invention is as follows:
A kind of full optic modulating device, including the first wavelength division multiplexer, the first Polarization Controller, optical fiber connector, the second wave
Division multiplexer, the second Polarization Controller and the polarizer, it is characterized in that the optical fiber connector is that be clamped with tungsten sulfide water-soluble
Property film optical fiber connector, first wavelength division multiplexer, the first Polarization Controller, optical fiber connector, the second wavelength-division are multiple
It is sequentially connected with device, the second Polarization Controller and the polarizer by single mode optical fiber, the first of first wavelength division multiplexer is defeated
Entering end is that 980nm controls light input end, and the second input terminal is 1550nm signal light input end, second wavelength division multiplexer
Second output terminal is the output end for controlling light, and the output end of the polarizer is that the 1550nm signal of this full optic modulating device is defeated
Outlet.
It is water-soluble that the optical fiber connector of the clamping tungsten sulfide water-soluble film is that two single mode optical fibers are clamped with tungsten sulfide
The FC/APC connector of property film.
The 980nm control light is the continuous light or pulsed light of power invariability.
The variation range of the 980nm control optical wavelength is 974nm~982nm.
The variation range of the 1550nm signal light wavelength is 1530nm~1590nm, first Polarization Controller
There is same specification and model, operation wavelength 1530-1590nm with the second Polarization Controller；First wavelength-division multiplex
Device, the first Polarization Controller have same specification and model；The polarizer operation wavelength is 1530-1590nm.
The operating method of above-mentioned full optic modulating device, it is characterised in that method includes the following steps:
1) photodetector of a 1550nm wavelength is connected to the output end of the polarizer, by the photodetector
Output terminate to oscillograph；
It 2) is that the 980nm control light of square wave inputs the first input end of the first wavelength division multiplexer by waveform；
3) continuous wave 1550nm signal light is inputted to the second input terminal of the first wavelength division multiplexer；
4) adjust first Polarization Controller so that on oscillograph the time domain impulse waveform of 1550nm signal light bottom
Portion's voltage is close to no-voltage；
5) adjust second Polarization Controller so that on oscillograph the time domain impulse waveform of 1550nm signal light top
Portion's voltage is maximum；
6) step 4) and 5) is repeated, so that the high voltage of the time domain waveform of 1550nm signal light and low-voltage on oscillograph
Ratio is maximum, to reach optimal extinction ratio；
7) photodetector and oscillograph are disconnected, 1550nm can be exported from the output end of the polarizer
Signal light provides use.
The principle of the invention is to utilize tungsten sulfide-PVA film thermo-optic effect and wavelength dependent absorption.Tungsten sulfide is to 980nm
Light has relatively strong absorption, after 980nm control light enters tungsten sulfide-PVA film by the first wavelength division multiplexer, tungsten sulfide material
Control light is absorbed, heat is generated, since film thickness does not lead to the non-uniform heat distribution generated etc., to pass through tungsten sulfide-
The thermo-optic effect of PVA film generates birefringent, i.e., the variations in refractive index generated on two orthogonal directions (being denoted as x and y) of film
It is different.And when 980nm control optical power is sufficiently high, in the direction x by the signal light phase delay of birefringent introducing compared to the side y
To lag π.Adjusting the first Polarization Controller makes polarization direction of the 1550nm signal light by tungsten sulfide-PVA film when be line
Polarization, and be 45 degree with x-axis angle.When controlling light there are 980nm, 1550nm signal light is passing through tungsten sulfide-PVA film
Afterwards, the phase of x direction signal component lags π relative to the signal component in the direction y, causes total polarization state to become and presss from both sides with x-axis
The linear polarization that angle is 135 degree.The second Polarization Controller is adjusted, so that equivalent after immediately tungsten sulfide-PVA film of the polarizer
Folk prescription is to being 135 degree with x-axis angle.In this way, 1550nm signal light polarization and the polarizer rise if controlling light without 980nm
For folk prescription to vertical, loss is maximum, and if there is 980nm controls light, then it is consistent to be polarized direction for 1550nm signal light polarization and the polarizer,
Loss is minimum.Tungsten sulfide-PVA film is unrelated with the control polarization state of light to the absorption of 980nm control light, therefore does not need to control
Polarization state processed is specially controlled.Tungsten sulfide ensure that system control with higher to the higher absorption of 980nm control light
Efficiency, tungsten sulfide absorption lower to 1550nm signal light ensure that low loss characteristic of the device near 1550nm wavelength.
Compared with prior art, the present invention has the advantage that
The present invention is by being prepared into the thin of certain thickness variation for the mixed liquor of tungsten sulfide dispersion liquid and PVA aqueous solution
Film, so that the present apparatus has compact-sized advantage.Using the wavelength dependent absorption of tungsten sulfide, the 980nm for selecting absorbability strong
Wavelength absorbs weak 1550nm wavelength as signal light as control optical signal, can get higher control efficiency and lower
Signal light insertion circulation.Two polarization states due to signal light along the direction x and y coexist in same optical path, and external disturbance is such as
The noise of the generations such as temperature, vibration is common-mode noise, and the influence to the work of whole device is smaller.Compared in background technique
Method 1 (nonlinear optical fiber), structure of the invention more concision and compact, cost are lower.It (is partly led compared to the method 2 in background technique
Body image intensifer), light loss of the present invention is smaller, and cost is lower, and structure is simpler.Compared to the 3 (graphite of method in background technique
The hot light of alkene), the present invention is absorbed with wavelength selectivity, and signal light loss is lower, and control efficiency is higher.
Detailed description of the invention
Fig. 1 is the structure chart of full light modulator device of the invention
In figure: the first wavelength division multiplexer of 1-, the first Polarization Controller of 2-, 3- clamp the connection of tungsten sulfide-PVA film optical fiber
Device, the second wavelength division multiplexer of 4-, the second Polarization Controller of 5-, the 6- polarizer
Fig. 2 is the schematic diagram of full optical modulator
Fig. 3 is the signal light output time-domain waveform diagram of full optical modulator, wherein (a) is measured on polarizer output port
The waveform of the control optical signal of the waveform and application of signal light is (b) to the single enlarged drawing for exporting modulated signal waveform.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, but protection model of the invention should not be limited with this
It encloses.
Fig. 1 is the structure chart of full light modulator device of the invention, as seen from the figure, the full optic modulating device of the present invention, including the
One wavelength division multiplexer 1, the first Polarization Controller 2, optical fiber connector 3, the second wavelength division multiplexer 4, the second Polarization Controller 5 and rise
Inclined device 6, it is characterized in that the optical fiber connector 3 is the optical fiber connector for being clamped with tungsten sulfide water-soluble film, it is described
First wavelength division multiplexer 1, the first Polarization Controller 2, optical fiber connector 3, the second wavelength division multiplexer 4,5 and of the second Polarization Controller
The polarizer 6 is sequentially connected by single mode optical fiber, and the first input end of first wavelength division multiplexer is that 980nm controls light input
End, the second input terminal are 1550nm signal light input end, and the second output terminal of second wavelength division multiplexer 4 is control light
Output end, the output end of the polarizer 6 are the 1550nm signal output end of this full optic modulating device.
The optical fiber connector of the clamping tungsten sulfide water-soluble film is that two single mode optical fibers are clamped with tungsten sulfide-PVA
The FC/APC connector of water-soluble film.
The 980nm control light is the continuous light or pulsed light of power invariability.
The variation range of the 980nm control optical wavelength is 974nm~982nm.
The variation range of the 1550nm signal light wavelength is 1530nm~1590nm, first Polarization Controller
2 and second Polarization Controller 5 have same specification and model, operation wavelength 1530-1590nm；First wavelength-division multiplex
Device 1, the first Polarization Controller 2 have same specification and model；The polarizer operation wavelength is 1530-1590nm.
The present invention is uneven using the generation heat distribution in uneven thickness of tungsten sulfide-PVA film, further generates birefringent effect
It answers, realizes full light modulation in conjunction with polarization interference structure.Specific structure is that 1550nm signal light and 980nm control light pass through respectively
Enter the first Polarization Controller 2, clamping tungsten sulfide-PVA film optical fiber connector 3 and the second wave after first wavelength division multiplexer 1
Division multiplexer 4.1550nm signal light is exported from the first output end of the second wavelength division multiplexer 4, and passes through the second Polarization Controller 5
With the polarizer 6.Remaining 980nm controls light and exports from the second output terminal of the second wavelength division multiplexer 4.
The operating method of above-mentioned full light modulator device, comprising the following steps:
1) photodetector of a 1550nm wavelength is connected to the output end of the polarizer 6, by the photodetection
The output of device terminates to oscillograph；
It 2) is that the 980nm control light of square wave inputs the first input end of the first wavelength division multiplexer 1 by waveform；
3) continuous wave 1550nm signal light is inputted to the second input terminal of the first wavelength division multiplexer 1；
4) first Polarization Controller 2 is adjusted, so that the time domain impulse waveform of 1550nm signal light on oscillograph
Bottom voltage is close to no-voltage；
5) second Polarization Controller 5 is adjusted, so that the time domain impulse waveform of 1550nm signal light on oscillograph
Top voltage is maximum；
6) step 4) and 5) is repeated, so that the high voltage of the time domain waveform of 1550nm signal light and low-voltage on oscillograph
Ratio is maximum, to reach optimal extinction ratio；
7) photodetector and oscillograph are disconnected, can be exported from the output end of the polarizer 6
1550nm signal light provides use.
In the preferred embodiment of the present invention, the size of film is about 1mm x 1mm, and tungsten sulfide dispersion liquid is removed by liquid phase
Method preparation then mixes drop on the vessel that bottom has certain thickness to change by being stirred after mixing with PVA aqueous solution
Drying obtains the non-uniform film of thickness distribution.
In the preferred embodiment of the present invention, the pulse period that 980nm controls light is 20ms, pulse width 5ms.
Fig. 2 gives the schematic diagram of apparatus of the present invention.X/y plane is vertical with direction of beam propagation, and E1 is 1550nm signal light
Polarization direction before inputting tungsten sulfide-PVA film, Ex and Ey are the component of E1 in the x and y direction.If no 980nm control
Light, then E1 is also that signal light passes through the polarization direction after film.When in the presence of control light, Ex ' is new x after signal light passes through film
Durection component, E2 are total polarization directions, with E1 at 90 degree.The polarizer to be polarized direction consistent with E2.Therefore, no control light
When, it is vertical that signal light by polarization after tungsten sulfide-PVA film and the polarizer is polarized direction, is lost very big, and has control light
When, it is consistent that signal light by polarization after tungsten sulfide-PVA film and the polarizer is polarized direction, be lost it is very low, to realize control
Modulation of the light to signal light.
Fig. 3 gives the time domain waveform of apparatus of the present invention.Black wave is to measure on 6 output port of the polarizer in Fig. 3 (a)
1550nm signal light waveform, grey waveform be apply 980nm control optical signal waveform.Fig. 3 (b) is to single output
The amplification of modulated signal waveform is shown, and carries out exponential fitting, the rising edge being fitted and decline to rising edge and failing edge
It is respectively 324.5 μ s and 353 μ s along time constant.
Claims (6)
1. a kind of full optic modulating device, including the first wavelength division multiplexer (1), the first Polarization Controller (2), optical fiber connector (3),
Second wavelength division multiplexer (4), the second Polarization Controller (5) and the polarizer (6), it is characterised in that the optical fiber connector (3)
It is the optical fiber connector for being clamped with tungsten sulfide water-soluble film, first wavelength division multiplexer (1), the first Polarization Controller
(2), optical fiber connector (3), the second wavelength division multiplexer (4), the second Polarization Controller (5) and the polarizer (6) pass through single mode optical fiber
It is sequentially connected, the first input end of first wavelength division multiplexer is that 980nm controls light input end, and the second input terminal is
1550nm signal light input end, the second output terminal of second wavelength division multiplexer (4) is the output end for controlling light, described
The output end of the polarizer (6) is the 1550nm signal output end of this full optic modulating device, and tungsten sulfide thin, water soluble film thickness differs.
2. full optic modulating device according to claim 1, it is characterised in that the clamping tungsten sulfide water-soluble film
Optical fiber connector is the FC/APC connector that two single mode optical fibers are clamped with tungsten sulfide water-soluble film.
3. full optic modulating device according to claim 1, it is characterised in that the 980nm control light is power invariability
Continuous light or pulsed light.
4. full optic modulating device according to claim 1, it is characterised in that the variation model of the 980nm control optical wavelength
It encloses for 974nm~982nm.
5. full optic modulating device according to claim 1, it is characterised in that the variation of the 1550nm signal light wavelength
Range is 1530nm~1590nm, and first Polarization Controller and the second Polarization Controller have same specification and model,
Operation wavelength is 1530-1590nm；First wavelength division multiplexer (1), the first Polarization Controller (2) have same specification and
Model；The polarizer operation wavelength is 1530-1590nm.
6. the operating method of full optic modulating device described in claim 1, it is characterised in that method includes the following steps:
1) photodetector of a 1550nm wavelength is connected to the output end of the polarizer (6), by the photodetector
Output terminate to oscillograph；
It 2) is that the 980nm control light of square wave inputs the first input end of the first wavelength division multiplexer (1) by waveform；
3) by the second input terminal of continuous wave 1550nm signal light input the first wavelength division multiplexer (1)；
4) adjust first Polarization Controller (2) so that on oscillograph the time domain impulse waveform of 1550nm signal light bottom
Portion's voltage is close to no-voltage；
5) adjust second Polarization Controller (5) so that on oscillograph the time domain impulse waveform of 1550nm signal light top
Portion's voltage is maximum；
6) repeat step 4) and 5) so that on oscillograph the high voltage of the time domain waveform of 1550nm signal light and low-voltage ratio
Maximum, to reach optimal extinction ratio；
7) photodetector and oscillograph are disconnected, 1550nm can be exported from the output end of the polarizer (6)
Signal light provides use.
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