WO2019184203A1

WO2019184203A1 - Black phosphorus material-based all-optical phase modulator and application thereof

Info

Publication number: WO2019184203A1
Application number: PCT/CN2018/101417
Authority: WO
Inventors: 张晗; 王云征
Original assignee: 张晗
Priority date: 2018-03-30
Filing date: 2018-08-21
Publication date: 2019-10-03
Also published as: CN108594479A

Abstract

A black phosphorus material-based all-optical phase modulator (100), comprising a signal light source (1), a pump light source (3), a first coupler (2), a modulation arm (20), a reference arm (30), and a second coupler (11). The signal light source (1) and the pump light source (3) are used for producing signal light and pump light respectively; one path of signal light is input into the modulation arm (20) together with the pump light for processing, and the other path of signal light is input into the reference arm (30) for processing; the modulation arm (20) comprises a black phosphorus-optical fiber composite structure (5); the black phosphorus-optical fiber composite structure (5) comprises a functional optical fiber and a black phosphorus material layer disposed on the functional optical fiber; one path of signal light processed by the black phosphorus-optical fiber composite structure (5) and the other path of signal light processed by the reference arm (30) enter the second coupler (11) simultaneously so that the two paths of signal light converge and interfere. The all-optical phase modulator (100) implements low-loss and wide-broadband light modulation and information loading in the whole optical domain and can be applied to the fields of all-optical phase shifters, all-optical intensity modulators, all-optical signal loaders, or negative logical systems.

Description

All-optical phase modulator based on black phosphorus material and its application

The present invention claims the priority of the prior application filed on Mar. 30, 2018, the disclosure of which is incorporated herein by reference. The content is incorporated into this text by way of introduction.

Technical field

The invention relates to the field of all-optical communication and all-optical information processing, in particular to an all-optical phase modulator based on black phosphorus material and an application thereof.

Background technique

With the continuous improvement of communication capacity and information processing speed, the traditional electric modulator has been unable to meet the increasing communication requirements due to its shortcomings such as limited bandwidth and high power consumption. The optical modulator can load the modulated signal into parameters such as amplitude, phase, polarization or wavelength of the light wave. Because of its wide bandwidth and high speed, it becomes a key component in the field of optical communication systems and optical information processing. At present, the optical modulator mainly has an electro-optic modulator and an all-optical modulator, wherein the all-optical modulator controls the on-off or conversion of another beam through one beam of light, and it completely works in the field of photonics without the need for the outside world. Applying electrical, thermal, magnetic and other physical influences, and achieving ultra-fast, low-loss and wide-bandwidth signal loading in fiber or waveguide structures, has received more and more attention and research.

The all-optical modulator can be divided into an intensity modulator, a phase modulator and a wavelength converter according to the controlled parameters of the signal light, and can be classified into a material based saturation absorption characteristic, an optical Kerr effect, a thermo-optic effect, and the fourth according to the working mechanism. Wave mixing effects and spatial self-phase modulation. Among them, the phase modulator can obtain higher overall transmittance and greater modulation depth, and the phase modulator based on the thermo-optic effect has the advantages of simple operation and full fiber.

At present, an all-optical phase modulator based on the thermo-optic effect of graphene material and transition metal chalcogenide MoS ₂ is reported separately. Since the energy band structure of graphene is a zero band gap Dirac cone, which has the characteristics of broadband absorption, the loss of signal light is relatively large, and it is not suitable for phase type optical devices. However, MoS ₂ is a direct bandgap semiconductor only in a single layer, and an indirect bandgap semiconductor in both bulk and small layers, and the photoresponse is mainly in the visible light band, which limits its in the infrared band, especially the optical communication band. Applications. In addition, MoS ₂ also has a strong light absorption and therefore introduces a large insertion loss.

Therefore, it is necessary to provide a new all-optical phase modulator.

Summary of the invention

In order to solve the above problems, the present invention provides an all-optical phase modulator based on a black phosphorus material for the purpose of realizing light modulation and information loading in a low-loss, wide-bandwidth all-optical region.

A first aspect of the present invention provides an all-optical phase modulator based on a black phosphor material, comprising a signal light source, a pump light source, a first coupler, a modulation arm, a reference arm, and a connection with the modulation arm and the reference arm Second coupler;

The first coupler includes an input end, an A output end, and a B output end, the input end is connected to the signal light source, the A output end is connected to the modulation arm, and the B output end is connected with the reference An arm connection; the signal source and the pump source are respectively configured to generate signal light and pump light; the signal light enters the first coupler through the input, the first coupler is configured to transmit the signal The light is divided into two paths; one of the signal lights is input to the modulation arm through the A output terminal and the pump light for processing, and the other signal light is input to the reference arm through the B output terminal for processing; The modulation arm comprises a black phosphorus-fiber composite structure comprising a functionalized fiber and a layer of black phosphor material disposed on the functionalized fiber, the black phosphorus-fiber composite structure for absorbing the The pump light generates heat, and the phase of the signal light is changed by a thermo-optic effect; one signal light processed by the black phosphorus-fiber composite structure and another signal light processed by the reference arm simultaneously enter the second coupler For two optical signals will interfere combined.

Wherein, the functionalized fiber comprises a micro-nano fiber, a D-shaped fiber or a fiber head.

Wherein the black phosphorus material layer comprises a covalently functionalized, surface-coordinated, protectively encapsulated, metal ion-modified or fluorinated black phosphorus material.

Wherein, the black phosphorus material layer comprises black phosphorus nanosheets, and the black phosphorus nanosheets have a thickness of 0.5-5 nm.

Wherein the modulation arm further includes a first wavelength division multiplexer and a second wavelength division multiplexer, the first wavelength division multiplexer, the black phosphorus-fiber composite structure, and the second wave division Connected in sequence, the first wavelength division multiplexer is configured to introduce the one signal light and the pump light into the black phosphorus-fiber composite structure; the second wavelength division multiplexer is used to The remaining pump light that is not absorbed is filtered out of the optical path.

Wherein the reference arm includes a variable optical attenuator for adjusting a ratio of light in the modulation arm and the reference arm; and a variable optical delay line; the variable optical delay line For adjusting the length difference between the modulation arm and the reference arm.

Wherein the B output end is connected to the variable optical attenuator, the variable optical attenuator is connected to one end of the variable optical delay line, and the other end of the variable optical delay line is opposite to the first Two coupler connections.

Wherein, the variable optical attenuator comprises a manual type, an electric type, or an equivalent type optical attenuator formed by bending an optical fiber or adjusting an optical fiber joint.

Wherein, the variable optical delay line comprises a manual type, an electric type, or an equivalent type optical delay line formed by cutting the length of the optical fiber a plurality of times.

Wherein the black phosphor-based all-optical phase modulator further includes a polarization controller, the polarization controller including a first end and a second end, the first end and the modulation arm and the reference arm, respectively Connected, the second end is coupled to the second coupler, and the polarization controller is configured to adjust a polarization state of two signal lights to be incident on the second coupler.

Wherein, the polarization controller comprises a twisted, extruded or wave plate type polarization controller.

The all-optical phase modulator based on the black phosphor material further includes a first output end and a second output end respectively connected to the second coupler, and the interfered signal light is respectively from the first output end And outputting the second output.

Wherein the first output end and the second output end are two ports disposed on the second coupler or are independent components connected to the second coupler port.

Wherein, the pumping source comprises a continuous laser, a pulsed laser or a modulated laser with information coding.

Wherein, the pumping source is a 980 nm continuous light source, a 980 nm pulse light source or a 980 nm modulated light source.

Wherein, the signal light source comprises a supercontinuum source, a broadband ASE source, a narrowband continuous laser or a narrowband DFB source.

Wherein, the signal light source is a 1550 nm ASE light source or a 1550 nm DFB light source.

Wherein the all-optical phase modulator based on black phosphorus material further comprises a pump light deriving element connected to the second wavelength division multiplexer, the pump light deriving element for dividing the second wavelength The pump light filtered by the multiplexer is led out of the optical path.

Wherein, the black phosphorus-fiber composite structure has a loss of 3-10 dB.

A second aspect of the invention provides the use of an all-optical phase modulator that can be applied to an all-optical phase shifter, a full light intensity modulator, an all-optical signal loader, or a negative logic system.

In summary, the beneficial effects of the present invention include the following aspects:

The all-optical phase modulator based on black phosphorus material provided by the invention overcomes the problem of the electronic bottleneck of the conventional electro-optic modulator, realizes wide bandwidth operation, and the applicable spectral range is greatly improved. In addition, the all-optical phase modulator can achieve greater phase shifting of the signal light. At the same time, the all-optical phase modulator is simple in structure, easy to operate, has low transmission loss, and is compatible with existing fiber-optic communication systems. The all-optical phase modulator based on black phosphorus material provided by the invention can be used in the fields of all-optical phase shifter, all-optical intensity modulator and all-optical signal loader, and can be used in a negative logic system.

DRAWINGS

1 is a schematic structural diagram of an all-optical phase modulator based on a black phosphorus material according to an embodiment of the present invention;

2 is a graph showing the relationship between the phase shift amount and the pump power obtained in Example 1;

3 is a waveform diagram of the signal light intensity obtained in Embodiment 2 after being modulated;

Fig. 4 is a waveform diagram in which the information of the pump light obtained in the third embodiment is loaded to the signal light.

Reference numeral

100-All-optical phase modulator based on black phosphorus material, 1-signal source, 2-first coupler, 3-pump source, 20-modulation arm, 30-reference arm, 4-first wavelength division multiplexer (first WDM), 5-black phosphorus-fiber composite structure, 6-second wavelength division multiplexer (second WDM), 7-pump light derivation element, 8-variable optical attenuator, 9-variable Optical delay line, 10-polarization controller, 11-second coupler, 12-first output, 13-second output. The respective components are connected by a common optical fiber such as a common single mode fiber. The arrows in Fig. 1 indicate the direction of light transmission.

detailed description

The following is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is the scope of protection of the present invention.

Referring to FIG. 1 , an embodiment of the present invention provides an all-optical phase modulator 100 based on a black phosphor material, including a signal light source 1 , a pump light source 3 , a first coupler 2 , a modulation arm 20 , a reference arm 30 , and The modulation arm 20 and the second coupler 11 connected to the reference arm 30;

The first coupler 2 includes an input end, an A output end and a B output end (not shown), the input end is connected to the signal light source 1, and the A output end is connected to the modulation arm 20 The B output terminal is connected to the reference arm 30; the signal light source 1 and the pump light source 3 are respectively used for generating signal light and pump light; the signal light enters the first coupling through the input end The first coupler 2 is configured to divide the signal light into two paths; one of the signal lights is input to the modulation arm 20 through the A output end and the pump light for processing, and the other signal is Light is input through the B output terminal to the reference arm 30; the modulation arm 20 includes a black phosphorus-fiber composite structure 5, the black phosphorus-fiber composite structure 5 includes a functionalized fiber and is disposed in the functionalized a black phosphorous material layer on the optical fiber, the black phosphorus-fiber composite structure 5 for absorbing the pump light to generate heat, and changing the phase of the signal light by a thermo-optic effect; passing through the black phosphorus-fiber composite structure 5 The processed signal light and the other path processed by the reference arm 30 The signal light enters the second coupler 11 at the same time for combining the two signal lights to interfere.

An all-optical phase modulator based on a black phosphorus material provided by an embodiment of the present invention has a monolithic structure of a Mach-Zehnder interferometer (Mach-Zehnder interferometer).

In the embodiment of the present invention, the signal light source 1 comprises a supercontinuum source, a broadband ASE source (wideband amplified spontaneous emission source), a narrowband continuous laser or a narrowband DFB source. Optionally, the signal light source 1 is a 1550 nm ASE light source or a 1550 nm DFB light source.

In the embodiment of the invention, the pumping light source 3 is connected to the modulation arm 20. The pumping source 3 is a continuous laser, a pulsed laser or a modulated laser with information coding. Optionally, the pumping source 3 is a 980 nm continuous light source, a 980 nm pulsed light source or a 980 nm modulated light source.

In an embodiment of the invention, the coupling ratio of the first coupler 2 is determined according to the loss of the black phosphor material and the respective fiber optic devices to obtain maximum signal light utilization efficiency. Optionally, the coupling ratio is 90:10, such as the A output is a 90% output, and the B output is a 10% output.

In the embodiment of the present invention, the working principle of the black phosphorus-fiber composite structure 5 is that the black phosphorus material is used for absorbing pump light to generate heat and raising the temperature of itself and the optical fiber, which causes black due to the thermo-optic effect. The refractive index of the phosphor material and the fiber changes to change the phase of the signal light.

In the embodiment of the invention, the functionalized fiber in the black phosphorus-fiber composite structure 5 comprises a micro/nano fiber, a D-shaped fiber or a fiber tip. The black phosphor material layer is formed by depositing a black phosphorus material such as black phosphorus nanosheet on the micro/nano fiber, the D-shaped fiber or the fiber tip by deposition or spin coating. Optionally, the micro/nano fiber is prepared from a common single mode fiber (SMF-28E) taper. The diameter of the micro-nano fiber is a conventional choice in the industry, and is not particularly limited herein. Optionally, the D-type optical fiber is on a standard single-mode communication optical fiber, and a part of the cylindrical optical fiber cladding is polished away by using optical micro-machining technology to form a D-type optical fiber. Optionally, the fiber optic head may select a fiber optic connector that is conventionally used, and is not particularly limited herein. Optionally, the specific process of the deposition or spin coating is a conventional selection, and is not particularly limited herein.

In an embodiment of the invention, the black phosphorus material layer includes a modified or unmodified black phosphorus material. Optionally, the black phosphorus material comprises black phosphorus modified by a modification means such as covalent functionalization, surface coordination, protective encapsulation, metal ion modification or fluorination. The modified black phosphorus material is more stable and is not easily oxidized. Alternatively, the black phosphorus material may be a black phosphorus material modified with at least one of gold ions, silver ions, iron ions, magnesium ions, mercury ions, and calcium ions. The choice of specific black phosphorus materials is selected according to the actual situation. The thickness of the black phosphor material layer disposed on the functionalized fiber in the black phosphorus-fiber composite structure is not particularly limited, and may be nanoscale or micron. The thickness of the black phosphor material layer disposed on the functionalized fiber by spin coating is 1-10 μm, and the thickness of the black phosphor material layer disposed on the functionalized fiber by deposition is 10-20 μm. Optionally, the black phosphorus material layer comprises black phosphorus nanosheets, the black phosphorus nanosheets have a thickness of 0.5-5 nm, and the black phosphorus nanosheets generally have a number of atomic layers of 1-10 layers. The lateral dimensions of the black phosphorus nanoflakes are not required. Optionally, the black phosphorus-fiber composite structure has a loss between 3-10 dB, specifically, a loss of 10 dB.

In the embodiment of the present invention, the modulation arm 20 further includes a first wavelength division multiplexer 4 (first WDM) and a second wavelength division multiplexer 6 (second WDM), the first wavelength division multiplexer 4. The black phosphorus-fiber composite structure 5 and the second wavelength division multiplexer 6 are sequentially connected to form the modulation arm 20, and the first wavelength division multiplexer 4 is configured to transmit the one signal light therein. The pump light is introduced into the black phosphorus-fiber composite structure 5; the second wavelength division multiplexer 6 is configured to filter the unabsorbed residual pump light from the optical path. Optionally, the second wavelength division multiplexer 6 is a wavelength division multiplexer or filter that filters the pump light and passes the signal light.

In the embodiment of the invention, the second coupler 11 is a 3dB coupler.

In the embodiment of the present invention, the black phosphor-based all-optical phase modulator 100 further includes a pump light deriving element 7 connected to the second wavelength division multiplexer 6, and the pump light deriving element 7 The pump light filtered out by the second wavelength division multiplexer 6 is led out from the optical path. Optionally, the pump light directing element 7 comprises a material having a higher refractive index than the core of the optical fiber, such as a high refractive material having a refractive index of > 1.5. Specifically, the high refractive material is an ultraviolet curing high refractive optical adhesive.

In the embodiment of the present invention, the reference arm 30 includes a variable optical attenuator 8 and a variable optical delay line 9 connected in sequence, and the variable optical attenuator 8 is used to adjust the modulation arm 20 and the reference arm The intensity ratio in 30; the variable optical delay line 9 is used to adjust the difference in length between the modulation arm 20 and the reference arm 30. Optionally, the B output terminal is connected to the variable optical attenuator 8 , and the variable optical attenuator 8 is connected to one end of the variable optical delay line 9 , and the variable optical delay line 9 The other end is connected to the second coupler 11. Optionally, the variable optical attenuator 8 comprises a manual type, an electric type, or an equivalent type optical attenuator constructed by bending an optical fiber or adjusting an optical fiber joint. Alternatively, the variable optical delay line 9 includes a manual type, an electric type, or an equivalent type optical delay line formed by cutting the length of the fiber a plurality of times.

In the embodiment of the present invention, the black phosphor-based all-optical phase modulator 100 further includes a polarization controller 10, the polarization controller 10 including a first end and a second end (not shown), a first end of the polarization controller 10 is coupled to the modulation arm 20 and the reference arm 30, a second end of the polarization controller 10 is coupled to the second coupler 11, and the polarization controller 10 is used to adjust a desired The polarization state of the two signal lights incident on the second coupler 11. Optionally, the polarization controller 10 comprises a twisted, extruded or wave plate type polarization controller.

In the embodiment of the present invention, the black phosphor-based all-optical phase modulator 100 further includes a first output end 12 and a second output end 13 respectively connected to the second coupler 11, and the interfered signal light Outputted from the first output terminal 12 and the second output terminal 13, respectively. Optionally, the first output end 12 and the second output end 13 may be two ports disposed on the second coupler 11 or independent components that may be connected to the second coupler 11 port .

Specifically, as shown in FIG. 1 , an all-optical phase modulator 100 based on a black phosphorus material provided by an embodiment of the present invention is a Mach-Zehnder interferometer, including a signal light source 1 and a first coupler 2 . a pumping light source 3, a first WDM 4, a black phosphorus-fiber composite structure 5, a second WDM 6, a pump light deriving element 7, a variable optical attenuator 8, a variable optical delay line 9, a polarization controller 10, The second coupler 11, the first output terminal 12 and the second output terminal 13. Wherein, the first WDM 4, the black phosphorus-fiber composite structure 5 and the second WDM 6 form a modulation arm 20, and the variable optical attenuator 8 and the variable optical delay line 9 form a reference arm 30; specifically, the signal light source 1 and The input end of a coupler 2 is connected, the A output of the first coupler 2 is connected to an input of the first wavelength division multiplexer 4, and the pump light source 2 and the other input of the first wavelength division multiplexer 4 are connected. The terminal is connected, and the output of the first wavelength division multiplexer 4 is connected to the black phosphorus-fiber composite structure 5. The second wavelength division multiplexer 6 includes an input end and two output ends. The input end of the second wavelength division multiplexer 6 is connected to the black phosphorus-fiber composite structure 5, and one of the second wavelength division multiplexer 6 outputs The end is connected to the pump light directing element 7 and the other output is connected to an input of the polarization controller 10. The B output of the first coupler 2 is connected to the variable optical attenuator 8, the variable optical attenuator 8 is connected to the variable optical delay line 9, and the variable optical delay line 9 is connected to the other input of the polarization controller 10. The polarization controller 10 is connected to the second coupler 11. An output of the second coupler 11 is connected to the first output 12, and the other output of the second coupler 11 is connected to the second output 13.

The signal light source 1 and the pump light source 3 are used to generate signal light and pump light, respectively. The first coupler 2 and the second coupler 11 are respectively used to split the signal light into two paths and to separate the separated signal light from the first output terminal 12 and the second output terminal 13 after recombination. The first WDM 4 and the second WDM 6 are respectively used to introduce pump light into the black phosphorus-fiber composite structure 5 and to filter out unabsorbed residual pump light from the optical path. The black phosphor material is used to absorb the pump light to generate heat and raise the temperature of itself and the fiber, thereby changing the phase of the signal light by the thermo-optic effect. The pump light directing element 7 serves to effectively direct the remaining pump light out of the optical path. The variable optical attenuator 8 is used to adjust the intensity ratio in the two arms of the Mach-Zehnder interferometer to obtain a high interference contrast. The variable optical delay line 9 is used to adjust the length difference of the two arms of the Mach-Zehnder interferometer to vary the size of the free spectral range. The polarization controller 10 is for adjusting the polarization states of the two signal lights incident to the second coupler 11 to obtain a high interference contrast.

Advantageous effects of the present invention include:

1. The all-optical phase modulator based on black phosphorus material provided by the invention overcomes the problem of the electronic bottleneck of the conventional electro-optic modulator, realizes wide bandwidth operation, and greatly improves the applicable spectral range.

2. The all-optical phase modulator based on black phosphorus material provided by the invention has simple structure, is easy to operate, has low transmission loss, and can be compatible with existing optical fiber communication systems.

3. The black phosphorus material used in the invention has strong photothermal performance, and can absorb a pumping light to generate a higher temperature rise, thereby obtaining a larger phase shift of the signal light.

4. The black phosphorus material used in the present invention is a direct bandgap semiconductor whose band gap is related to thickness. The performance of the band gap can be easily adjusted by changing the band gap size, and can cover the infrared band, especially the optical communication band.

5. The all-optical phase modulator based on black phosphorus material provided by the invention can be used in the fields of all-optical phase shifter, all-optical intensity modulator and all-optical signal loader, and can be used in a negative logic system.

Example 1:

As shown in FIG. 1 , the first embodiment provides an all-optical phase modulator based on a black phosphor material, wherein the signal light source 1 of the first embodiment is a 1550 nm ASE light source; the pump light source 3 is a 980 nm continuous light source; The phosphorus-fiber composite structure 4 comprises a micro/nano fiber and a black phosphorus material layer disposed on the micro/nano fiber, the material in the black phosphorus material layer is a fluorinated black phosphorus nanosheet; the variable optical attenuator 8 is a manual type variable light. The attenuator, the variable optical delay line 9 is an equivalent type optical delay line formed by cutting the length of the fiber a plurality of times.

The 1550 nm ASE light is split into two paths by the first coupler 2, one pass through the reference arm 30 composed of the variable optical attenuator 8, the variable optical delay line 9 and the ordinary optical fiber, all passing through the first DWM4, black phosphorus-fiber composite The modulation arm 20 composed of the structure 5 and the second WDM6, the polarization controller 10 is for adjusting the polarization states of the two signal lights incident on the second coupler 11 to obtain a high interference contrast, and finally generated at the second coupler 11. Interference and output from the first output terminal 12 and the second output terminal 13. By adjusting the power of 980nm continuous light, the phase shift of the 1550nm ASE light in the modulation arm can be changed, so that the interference effect changes, and the transmission spectrum of the two outputs is shifted left and right, thereby achieving the purpose of all-optical phase modulation. The transmission spectrum is a cosine function, ie (1+cos(Δφ+φs))/2, where Δφ is the phase difference between the two arms due to the difference in length, and φs is the phase shift caused by the thermo-optic effect in the modulation arm.

The relationship between the phase shift amount of 1550 nm ASE light and the power of 980 nm continuous light is as shown in Fig. 2. When the power is 290 mW, a phase shift amount of 8π is obtained. The phase shift amount is approximately linear with the power, and the slope is 0.029π/mW.

Example 2:

As shown in FIG. 1, this embodiment 2 provides a black phosphor-based all-optical phase modulator similar to that described in Embodiment 1, except that the signal light source 1 in Embodiment 2 is a 1550 nm DFB light source. The pumping source 3 is a 980 nm pulsed light source.

Since the black phosphor-based all-optical phase modulator of the present embodiment has an overall structure of a Mach-Zehnder interferometer, and its transmission curve is controlled by 980 nm light, when the peak wavelength of the transmission curve is 1550 nm DFB light The transmittance is higher when the center wavelengths coincide; and the transmittance is lower when the valley wavelength of the transmission curve coincides with the center wavelength of the 1550 nm DFB light. Therefore, by changing the intensity of 980 nm light, the transmission power of 1550 nm DFB light can be controlled, thereby achieving the purpose of converting phase modulation into intensity modulation.

The waveform of the 980 nm pump light and the 1550 nm signal light modulated at the two output terminals is shown in Fig. 3. The signal light is modulated into pulse light having the same frequency, pulse width and duty ratio as the pump light. Since the heat accumulation and dissipation processes are slow to respond, the rising and falling edges of the signal light waveform become gentle. According to the law of conservation of energy, the waveforms of the first output and the second output satisfy a complementary relationship, that is, the rise of one waveform is accompanied by the decrease of the other waveform.

Example 3:

As shown in FIG. 1 , this embodiment 3 provides a black phosphor-based all-optical phase modulator similar to that described in Embodiment 1, except that the signal light source 1 in Embodiment 3 is a 1550 nm DFB light source. The pumping source 3 is a 980 nm modulated light source.

The light output from the 980nm modulated light source is preloaded with the ASCII signal of 'SZU'. The heat generated by the fluorinated black phosphorus after absorbing the 980nm modulated light is also changed according to the same code position law, so that the phase of the 1550nm DFB light is also the same. Regular changes. When the 1550 nm DFB light interferes at the second coupler, the intensity of the output light of the two outputs is also modulated to vary according to the ASCII code of 'SZU'. Figure 4 shows the measured pump light and the signal light of the two outputs. It can be seen that the information has been successfully loaded from the pump light to the signal light, and the optical signals at the two outputs have a bit flip relationship, which is suitable for negative In a logical link system.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An all-optical phase modulator based on a black phosphor material, comprising a signal light source, a pump light source, a first coupler, a modulation arm, a reference arm, and a second coupler coupled to the modulation arm and the reference arm ;

The first coupler includes an input end, an A output end, and a B output end, the input end is connected to the signal light source, the A output end is connected to the modulation arm, and the B output end is connected with the reference An arm connection; the signal source and the pump source are respectively configured to generate signal light and pump light; the signal light enters the first coupler through the input, the first coupler is configured to transmit the signal The light is divided into two paths; one of the signal lights is input to the modulation arm through the A output terminal and the pump light for processing, and the other signal light is input to the reference arm through the B output terminal for processing; The modulation arm comprises a black phosphorus-fiber composite structure comprising a functionalized fiber and a layer of black phosphor material disposed on the functionalized fiber, the black phosphorus-fiber composite structure for absorbing the The pump light generates heat, and the phase of the signal light is changed by a thermo-optic effect; one signal light processed by the black phosphorus-fiber composite structure and another signal light processed by the reference arm simultaneously enter the second coupling It is used to make two signals light merge and interfere.
The all-optical phase modulator of claim 1 wherein said functionalized fiber comprises a micro/nano fiber, a D-shaped fiber or a fiber optic head.
The all-optical phase modulator of claim 1 wherein said black phosphor material layer comprises covalently functionalized, surface coordinated, protectively encapsulated, metal ion modified or fluorinated black phosphorus material.
The all-optical phase modulator according to claim 1 or 3, wherein the black phosphor material layer comprises black phosphorus nanoflakes, and the black phosphorus nanoflakes have a thickness of 0.5 to 5 nm.
The all-optical phase modulator of claim 1 wherein said modulation arm further comprises a first wavelength division multiplexer and a second wavelength division multiplexer, said first wavelength division multiplexer, said black a phosphor-fiber composite structure and the second wavelength division multiplexer are sequentially connected, and the first wavelength division multiplexer is configured to introduce the one signal light and the pump light into the black phosphorus-fiber composite structure The second wavelength division multiplexer is configured to filter the remaining pump light that is not absorbed from the optical path.
The all-optical phase modulator of claim 1 wherein said reference arm comprises a variable optical attenuator and said variable optical delay line for adjusting said modulation arm and said reference arm The intensity ratio in the medium; the variable optical delay line is used to adjust the difference in length between the modulation arm and the reference arm.
The all-optical phase modulator of claim 6 wherein said B output is coupled to said variable optical attenuator, said variable optical attenuator being coupled to one end of said variable optical delay line, The other end of the variable optical delay line is connected to the second coupler.
The all-optical phase modulator of claim 6 wherein said variable optical attenuator comprises a manual type, an electric type, or an equivalent type optical attenuator constructed by bending an optical fiber or adjusting an optical fiber joint.
The all-optical phase modulator of claim 6 wherein said variable optical delay line comprises a manual type, an electric type, or an equivalent type optical delay line constructed by cutting a length of the fiber a plurality of times.
The all-optical phase modulator of claim 1 wherein said black phosphor-based all-optical phase modulator further comprises a polarization controller, said polarization controller comprising a first end and a second end, said One end is respectively connected to the modulation arm and the reference arm, the second end is connected to the second coupler, and the polarization controller is used for adjusting two signal lights to be incident on the second coupler Polarization state.
The all-optical phase modulator of claim 10 wherein said polarization controller comprises a twisted, extruded or wave plate polarization controller.
The all-optical phase modulator of claim 1 wherein said black phosphor-based all-optical phase modulator further comprises a first output and a second output coupled to said second coupler, respectively The interfered signal light is output from the first output end and the second output end, respectively.
The all-optical phase modulator of claim 12 wherein said first output and said second output are two ports disposed on said second coupler or are coupled to said second coupler A separate component to which the port is connected.
The all-optical phase modulator of claim 1 wherein said pumping source comprises a continuous laser, a pulsed laser or a modulated laser with information encoding.
The all-optical phase modulator of claim 14 wherein said pumping source is a 980 nm continuous source, a 980 nm pulse source or a 980 nm modulation source.
The all-optical phase modulator of claim 1 wherein said signal source comprises a supercontinuum source, a broadband ASE source, a narrowband continuous laser or a narrowband DFB source.
The all-optical phase modulator of claim 16 wherein said signal source is a 1550 nm ASE source or a 1550 nm DFB source.
The all-optical phase modulator of claim 5 wherein said black phosphor-based all-optical phase modulator further comprises a pump light directing element coupled to said second wavelength division multiplexer, said pump The pump light deriving element is used to derive the pump light filtered by the second wavelength division multiplexer from the optical path.
The all-optical phase modulator of claim 1 wherein said black phosphorus-fiber composite structure has a loss of 3-10 dB.
Use of an all-optical phase modulator according to any of claims 1-19 in an all-optical phase shifter, all-optical intensity modulator, all-optical signal loader or negative logic system.