CN115268117A - Tunable optical frequency comb generation device and method - Google Patents

Tunable optical frequency comb generation device and method Download PDF

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CN115268117A
CN115268117A CN202210997388.1A CN202210997388A CN115268117A CN 115268117 A CN115268117 A CN 115268117A CN 202210997388 A CN202210997388 A CN 202210997388A CN 115268117 A CN115268117 A CN 115268117A
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modulator
radio frequency
frequency signal
drive mach
dual
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赵峰
张维
李静玲
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Xian University of Posts and Telecommunications
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Xian University of Posts and Telecommunications
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0102—Constructional details, not otherwise provided for in this subclass
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/212—Mach-Zehnder type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/56—Frequency comb synthesizer

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  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a tunable optical frequency comb generating device and a method, relating to the technical field of optics, wherein the device comprises: the device comprises a double-drive Mach-Zehnder modulator, a phase modulator, an electroabsorption modulator, a laser emission component, a first signal source component and a second signal source component; the first signal source assembly is used for: sending a first radio frequency signal to a first input end of the dual-drive Mach-Zehnder modulator; sending a second radio frequency signal to a second input end of the dual-drive Mach-Zehnder modulator; the first radio frequency signal and the second radio frequency signal are used for adjusting the bias voltage of the dual-drive Mach-Zehnder modulator; transmitting a third radio frequency signal to an input terminal of the phase modulator; the second signal source component is used for sending a fourth radio frequency signal to the electroabsorption modulator; laser emitted by the laser emitting component is modulated by the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator in sequence to generate the optical frequency comb. The invention produces an optical frequency comb with good stability and tunable spectral line spacing.

Description

Tunable optical frequency comb generation device and method
Technical Field
The invention relates to the technical field of optics, in particular to a tunable optical frequency comb generation device and method.
Background
An Optical Frequency Comb (OFC) refers to a spectral line shape whose distribution in the Frequency domain is at equal Frequency intervals, and appears as a periodic Optical pulse train in the time domain like Comb teeth of a Comb. The special equal frequency interval spectrum characteristics of the optical frequency comb make the optical frequency comb have important application in many fields, such as spectral measurement, spectrometer calibration, arbitrary waveform generation, microwave photonics and the like. The high-flatness electro-optical modulation optical frequency comb can be used as a multi-channel laser light source to be applied to the field of communication, particularly a dense wavelength division multiplexing system, due to the fact that power change among comb teeth is small.
The current optical comb generation mode mainly comprises the following steps: a mode-locked laser method, a nonlinear optical fiber method, a micro-ring resonator method, a photoelectric oscillator method, an external modulator method, and the like. The device of the mode-locked laser method is simple, but the comb line power flatness is poor, the carrier number is not easy to control, and the required mode-locking condition is harsh and difficult to meet. The nonlinear optical fiber method can produce more comb lines, but the power flatness and the number of the comb lines are not easy to control. The optical comb generated by the micro-ring resonant cavity method has larger bandwidth, but the power flatness of the comb line is not high and the tuning process of the spectral line spacing is not easy to control. Although the photoelectric oscillator method does not need an additional radio frequency source, the scheme system uses more devices and is complex in device. Common modulators used in the external modulator method include a polarization modulator (PolM), a Phase Modulator (PM), a mach-zehnder modulator (MZM), an Intensity Modulator (IM), and a Frequency Modulator (FM). However, in the scheme for generating the optical Frequency comb based on the external modulator method reported so far, a single RF (Radio Frequency) or a plurality of RF superposed is used to drive the single external modulator, the generated comb lines are fewer in number or higher in cost and not high in flatness, and the Frequency spectrum presents a typical bat ear shape. The application of the comb teeth in the field of multi-channel laser light sources is limited due to the narrow frequency spectrum range and low flatness between the comb teeth.
Disclosure of Invention
The invention aims to provide a tunable optical frequency comb generation device and method, so that an optical frequency comb with good stability and tunable spectral line spacing is generated.
In order to achieve the purpose, the invention provides the following scheme:
a tunable optical frequency comb generation device comprises a double-drive Mach-Zehnder modulator, a phase modulator, an electroabsorption modulator, a laser emission component, a first signal source component and a second signal source component;
the first signal source component is to:
sending a first radio frequency signal to a first input end of the dual-drive Mach-Zehnder modulator;
sending a second radio frequency signal to a second input end of the dual-drive Mach-Zehnder modulator; the first radio frequency signal and the second radio frequency signal are used for adjusting bias voltage of the dual-drive Mach-Zehnder modulator;
transmitting a third radio frequency signal to an input of the phase modulator; the third radio frequency signal is used for driving the phase modulator;
the second signal source component is used for sending a fourth radio frequency signal to the electroabsorption modulator; the fourth radio frequency signal is used for adjusting the bias voltage of the electroabsorption modulator and driving the electroabsorption modulator;
and laser emitted by the laser emission component is modulated by the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator in sequence to generate an optical frequency comb.
Optionally, the first signal source component includes a radio frequency signal source, a power divider, a phase shifter, and an attenuator;
the output end of the radio frequency signal source is connected with the input end of the power divider;
the first output end of the power divider is connected with the first input end of the double-drive Mach-Zehnder modulator; a second output end of the power divider sequentially passes through the phase shifter and the attenuator and is connected with a second input end of the dual-drive Mach-Zehnder modulator; and the third output end of the power divider is connected with the input end of the phase modulator.
Optionally, the first signal source assembly further comprises an electrical amplifier;
one end of the electric amplifier is connected with the input end of the phase modulator, and the other end of the electric amplifier is connected with the third output end of the power divider.
Optionally, the tunable optical frequency generation apparatus further comprises a fiber amplifier;
one end of the optical fiber amplifier is connected with the phase modulator, and the other end of the optical fiber amplifier is connected with the electro-absorption modulator.
Optionally, the tunable optical frequency generation apparatus further comprises a spectrometer;
the spectrometer is connected with the electro-absorption modulator and is used for displaying and storing the optical frequency comb.
Optionally, the laser emission assembly includes a laser and a polarization controller connected in sequence;
the polarization controller is used for controlling the polarization direction of the first laser; the first laser is laser emitted by the laser.
In order to achieve the purpose, the invention also provides the following technical scheme:
a tunable optical frequency comb generation method, comprising:
setting a first radio frequency signal, a second radio frequency signal and a third radio frequency signal output by a first signal source component, and setting a fourth radio frequency signal output by a second signal source component; the third radio frequency signal is used for driving a phase modulator; the fourth radio frequency signal is used for adjusting the bias voltage of the electroabsorption modulator and driving the electroabsorption modulator;
adjusting the bias voltage of the dual-drive Mach-Zehnder modulator according to the first radio frequency signal and the second radio frequency signal;
and emitting laser light through a laser emission component, and enabling the laser light to sequentially pass through the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator so as to generate an optical frequency comb.
Optionally, adjusting a bias voltage of the dual-drive mach-zehnder modulator according to the first radio frequency signal and the second radio frequency signal specifically includes:
according to the formula
ΔA+Δθ＝π/2
Adjusting the bias voltage of the dual-drive Mach-Zehnder modulator;
wherein Δ a = (a) 1 -A 2 )/2，A 1 Representing the amplitude, A, of the first radio frequency signal 2 Represents the amplitude of the second radio frequency signal, Δ θ represents the phase difference of the bias voltage applied to the dual-drive mach-zehnder modulator, Δ θ = (θ) 1 -θ 2 )/2，θ 1 Representing the phase, theta, of a bias voltage applied to a first input terminal of a dual-drive Mach-Zehnder modulator 2 Representing the phase of the bias voltage applied to the second input of the dual-drive mach-zehnder modulator.
Optionally, the tunable optical frequency comb generating method further comprises:
and after the laser sequentially passes through the double-drive Mach-Zehnder modulator and the phase modulator, obtaining a preliminary optical frequency comb, amplifying the preliminary optical frequency comb, and then conveying the amplified preliminary optical frequency comb to the electroabsorption modulator.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a tunable optical frequency comb generation device and a tunable optical frequency comb generation method, wherein a first signal source component is used for respectively sending a first radio frequency signal to a first input end of a double-drive Mach-Zehnder modulator, sending a second radio frequency signal to a second input end of the double-drive Mach-Zehnder modulator and sending a third radio frequency signal to an input end of a phase modulator; a fourth radio frequency signal is transmitted to the electro-absorption modulator through the second signal source assembly. The method comprises the steps that a first radio frequency signal and a second radio frequency signal are respectively loaded to a double-drive Mach-Zehnder modulator, the bias voltage of the double-drive Mach-Zehnder modulator is adjusted, and the optical pulse with the high extinction ratio is achieved; driving the phase modulator by a third radio frequency signal; adjusting the bias voltage of the electro-absorption modulator through a fourth radio frequency signal and driving the electro-absorption modulator; the data adjustment of each part in the whole device is realized by integrating the three parts, and the laser emitted by the laser emitting component can be modulated by the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator in sequence to generate the optical frequency comb with a large number of comb teeth, a large bandwidth, high conversion efficiency and high flatness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a tunable optical frequency comb generating device according to the present invention;
FIG. 2 is a schematic flow chart of a tunable optical frequency comb generation method according to the present invention;
FIG. 3 is a graph of the spectrum of the output of the dual-drive Mach-Zehnder modulator of the present invention;
FIG. 4 is a graph of the spectrum of the phase modulator output of the present invention;
FIG. 5 is a graph of the spectrum of the output of the electro-absorption modulator of the present invention.
Description of the symbols:
the device comprises a 1-laser, a 2-polarization controller, a 3-double-drive Mach-Zehnder modulator, a 4-first radio frequency signal source, a 5-power divider, a 6-bias voltage, a 7-phase shifter, an 8-attenuator, a 9-phase modulator, a 10-electric amplifier, an 11-optical fiber amplifier, a 12-electric absorption modulator, a 13-second radio frequency signal source and a 14-spectrometer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and detailed description, in order to make the objects, features and advantages thereof more comprehensible.
Example one
As shown in fig. 1, the present embodiment provides a tunable optical frequency comb generating device, which includes a dual-drive mach-zehnder modulator 3, a phase modulator 9, an electroabsorption modulator 12, a laser emitting component, a first signal source component, and a second signal source component. In particular, the second signal source component corresponds to the second rf signal source 13 in fig. 1.
Wherein the first signal source component is to:
sending a first radio frequency signal to a first input end of the dual-drive Mach-Zehnder modulator 3;
sending a second radio frequency signal to a second input end of the dual-drive Mach-Zehnder modulator 3; the first radio frequency signal and the second radio frequency signal are used for adjusting a bias voltage 6 of the dual-drive Mach-Zehnder modulator 3;
sending a third radio frequency signal to an input of the phase modulator 9; the third radio frequency signal is used to drive the phase modulator 9.
The second signal source assembly is used for transmitting a fourth radio frequency signal to the electroabsorption modulator 12; the fourth rf signal is used to adjust the bias voltage of the electroabsorption modulator 12 and to drive the electroabsorption modulator 12.
The laser emitted by the laser emitting component is modulated by the double-drive Mach-Zehnder modulator 3, the phase modulator 9 and the electric absorption modulator 12 in sequence to generate an optical frequency comb.
Specifically, the first signal source component includes a radio frequency signal source (corresponding to the first radio frequency signal source 4 in fig. 1), a power divider 5, a phase shifter 7 and an attenuator 8. The output end of the radio frequency signal source is connected with the input end of the power divider 5; a first output end of the power divider 5 is connected with a first input end of the dual-drive Mach-Zehnder modulator 3; a second output end of the power divider 5 is connected with a second input end of the dual-drive Mach-Zehnder modulator 3 through the phase shifter 7 and the attenuator 8 in sequence; a third output terminal of the power divider 5 is connected to an input terminal of the phase modulator 9.
The first signal source assembly further comprises an electrical amplifier 10; one end of the electric amplifier 10 and the phaseThe input end of the bit modulator 9 is connected, and the other end of the electrical amplifier 10 is connected with the third output end of the power divider 5. That is, the rf signal with the modulation frequency ω output by the first rf signal source 4 is divided into three parts by the power divider 5: first part RF a Directly driving the upper arm of a dual-drive Mach-Zehnder modulator, the second part RF b The lower arm of the double-drive Mach-Zehnder modulator is driven after passing through a phase shifter 7 and an attenuator 8, and the third part drives a phase modulator 9 after being amplified by an electric amplifier 10.
The tunable optical frequency generation apparatus further includes a fiber amplifier 11 and a spectrometer 14. One end of the optical fiber amplifier 11 is connected to the phase modulator 9, and the other end of the optical fiber amplifier 11 is connected to the electro-absorption modulator 12. The spectrometer 14 is connected to the electro-absorption modulator 12, and the spectrometer 14 is used for displaying and storing the optical frequency comb. Namely, the output preliminary optical frequency comb of the phase modulator 9 is amplified by the optical fiber amplifier 11 and then sent to the electric absorption modulator 12; the electro-absorption modulator 12 controls the amplitude and bias voltage of the driving signal under the driving of the second rf signal source 13, so that the power of the low-order optical sideband of the primary optical frequency comb is increased, the power of the high-order optical sideband of the bat ear shape is reduced due to the large power, the power flatness of the comb spectrum is improved, and the optical frequency comb with a large number of comb teeth and a power flatness of 1.3db is finally obtained and transmitted to the spectrometer 14.
In one embodiment, the fiber amplifier 11 is an erbium doped fiber amplifier.
The laser emission component comprises a laser 1 and a polarization controller 2 which are connected in sequence; the polarization controller 2 is used for controlling the polarization direction of the first laser; the first laser is the laser emitted by the laser 1. Preferably, the laser 1 is an external cavity laser.
In summary, the tunable optical frequency comb generating device provided in this embodiment cascade the dual-drive mach-zehnder modulator, the phase modulator, and the electro-absorption modulator, and adjust the first signal source assembly and the second signal source assembly to construct the spectrum distribution of the optical frequency comb. The number of comb lines is greatly increased compared to most existing solutions and a higher bandwidth is achieved. The device is divided into three parts: 11 optical frequency combs with flatness within 1.3db and flatness within 4.5db are output by the first part of double-drive Mach-Zehnder modulator, and the sideband interval is omega; the second part of the phase modulator outputs 27 line flat optical combs with the flatness of 4.8dB; the third part of the electro-absorption modulator outputs an optical frequency comb with a large number of comb teeth and a power flatness of 1.3 db.
Example two
As shown in fig. 2, the present embodiment provides a tunable optical frequency comb generating method, including:
step 100, setting a first radio frequency signal, a second radio frequency signal and a third radio frequency signal output by a first signal source component, and setting a fourth radio frequency signal output by a second signal source component; the third radio frequency signal is used for driving a phase modulator; the fourth radio frequency signal is used to adjust a bias voltage of the electro-absorption modulator and to drive the electro-absorption modulator.
Specifically, the third rf signal drives the phase modulator after being amplified by the electrical amplifier, and the output of the phase modulator at this time is:
Figure BDA0003805942520000071
wherein A is 3 Is the modulation index of the phase modulator.
And 200, adjusting the bias voltage of the dual-drive Mach-Zehnder modulator according to the first radio frequency signal and the second radio frequency signal. Specifically, step 200 includes:
according to the formula
ΔA+Δθ＝π/2
Adjusting the bias voltage of the dual-drive Mach-Zehnder modulator;
wherein Δ a = (a) 1 -A 2 )/2，A 1 Representing a first radio frequencyAmplitude of the signal, A 2 Represents the amplitude of the second radio frequency signal, Δ θ represents the phase difference of the bias voltage applied to the dual-drive mach-zehnder modulator, Δ θ = (θ) 1 -θ 2 )/2，θ 1 Representing the phase, θ, of a bias voltage applied to the first input of the dual-drive Mach-Zehnder modulator 2 Representing the phase of the bias voltage applied to the second input of the dual-drive mach-zehnder modulator.
And 300, emitting laser through a laser emitting component, and enabling the laser to sequentially pass through the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator so as to generate an optical frequency comb. Specifically, the laser 1 emits light with a wavelength λ and an amplitude E in The polarization direction of the laser light is adjusted by the polarization controller 2, is consistent with the polarization direction of the double-drive Mach-Zehnder modulator 3, and enters the double-drive Mach-Zehnder modulator 3; the radio frequency signal with the modulation frequency ω output by the first radio frequency signal source 4 is divided into three parts by the power divider 5: first part RF a Directly driving the upper arm of a dual-drive Mach-Zehnder modulator, the second part RF b The lower arm of the double-drive mach-zehnder modulator is driven via a phase shifter 7 and an attenuator 8, and the third part drives a phase modulator 9 after being amplified via an electrical amplifier 10.
Wherein, RF a Has an amplitude of A 1 ，RF b Has an amplitude of A 2 The method comprises the following steps:
RF a ＝A 1 sinωt
RF b ＝A 2 sinωt
after the double-drive Mach-Zehnder modulator modulates the laser, the electric field of the output light is E out The method comprises the following steps:
Figure BDA0003805942520000081
wherein, J k (. -) is a Bessel function of order k.
Further, if it is, the conversion efficiency η κ Defined as the optical frequency of the k orderIntensity of rate comb component P κ And the input light intensity P in Ratio, then when the drive amplitude is a larger amplitude signal, A 1 And A 2 When sufficiently large, the conversion efficiency eta κ The calculation formula of (a) is as follows:
Figure BDA0003805942520000082
wherein,
Figure BDA0003805942520000083
ΔA＝(A 1 -A 2 )/2，Δθ＝(θ 1 -θ 2 )/2。
from this it is obtained: the condition for a flat line characteristic is η κ Regardless of the order k, the conditions for obtaining a flat spectral line characteristic are as follows:
ΔA+Δθ＝π/2。
preferably, if both the planarization condition and the maximum efficiency are to be met, the first and second rf signals are adjusted such that Δ a = Δ θ = π/4 to meet the maximum efficiency planarization condition.
In a specific embodiment, a spectrogram output after modulation by the dual-drive mach-zehnder modulator is shown in fig. 3; the phase modulator modulates the output of the dual-drive mach-zehnder modulator as a light source, thereby generating a 27-line flat optical comb, and fig. 4 is a spectrogram of the output of the phase modulator; amplifying the output preliminary optical frequency comb of the phase modulator by an erbium-doped fiber amplifier, and then transmitting the amplified preliminary optical frequency comb to an electric absorption modulator; the electro-absorption modulator enables the power of the low-order optical sidebands of the amplified preliminary optical frequency comb to be increased, the power of the bat-ear-shaped high-order optical sidebands is reduced due to the fact that the power is too large originally, the power flatness of the comb spectrum is improved, and finally the optical frequency comb with the large number of comb teeth and the power flatness of 1.3db is obtained, and a spectrogram output by the electro-absorption modulator is shown in fig. 5; and finally, transmitting the data to a spectrometer for display and storage.
Compared with the prior art, the invention also has the following advantages:
(1) The invention adopts a cascade electro-optical modulation method of the double-drive Mach-Zehnder, the phase modulator and the electro-absorption modulator to generate the optical frequency comb with a wide spectral range of 500GHz, and the generated optical frequency comb has the advantages of high spectral flatness, more comb teeth, large bandwidth, high conversion efficiency, good stability and tunable spectral line spacing; the device has the advantages of simple structure and flexible operation, and becomes a practical first choice for broad scholars.
(2) The electro-absorption modulator adopted in the invention further optimizes the flatness of the ultra-wide OFC, and has the advantages of low output noise, easy integration and the like. In practical application, the radio frequency source can be directly used for driving the electric absorption modulator, so that the power of the low-order optical sideband of the comb spectrum generated by the cascade single-stage double-drive Mach-Zehnder modulator and the phase modulator is increased, the power of the high-order optical sideband of the bat-ear shape is reduced due to too high power, the power flatness of the comb spectrum is improved, and the optical frequency comb with a large number of comb teeth and high power flatness is finally obtained.
(3) The tunable optical Frequency comb generating device can greatly reduce the number of light sources in a WDM (Wavelength Division Multiplexing) system and an OFDM (Orthogonal Frequency Division Multiplexing) system, thereby reducing the system cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.

Claims (9)

1. The tunable optical frequency comb generation device is characterized by comprising a double-drive Mach-Zehnder modulator, a phase modulator, an electroabsorption modulator, a laser emission component, a first signal source component and a second signal source component;
the first signal source assembly is to:
sending a first radio frequency signal to a first input end of the dual-drive Mach-Zehnder modulator;
sending a second radio frequency signal to a second input end of the dual-drive Mach-Zehnder modulator; the first radio frequency signal and the second radio frequency signal are used for adjusting bias voltage of the dual-drive Mach-Zehnder modulator;
transmitting a third radio frequency signal to an input of the phase modulator; the third radio frequency signal is used for driving the phase modulator;
the second signal source component is used for sending a fourth radio frequency signal to the electroabsorption modulator; the fourth radio frequency signal is used for adjusting the bias voltage of the electroabsorption modulator and driving the electroabsorption modulator;
and laser emitted by the laser emission component is modulated by the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator in sequence to generate an optical frequency comb.
2. The tunable optical frequency comb generation apparatus of claim 1, wherein the first signal source assembly comprises a radio frequency signal source, a power divider, a phase shifter, and an attenuator;
the output end of the radio frequency signal source is connected with the input end of the power divider;
the first output end of the power divider is connected with the first input end of the double-drive Mach-Zehnder modulator; a second output end of the power divider sequentially passes through the phase shifter and the attenuator and is connected with a second input end of the dual-drive Mach-Zehnder modulator; and a third output end of the power divider is connected with an input end of the phase modulator.
3. The tunable optical frequency comb generation apparatus of claim 2, wherein the first signal source assembly further comprises an electrical amplifier;
one end of the electric amplifier is connected with the input end of the phase modulator, and the other end of the electric amplifier is connected with the third output end of the power divider.
4. The tunable optical frequency comb generation device of claim 1, further comprising a fiber amplifier;
one end of the optical fiber amplifier is connected with the phase modulator, and the other end of the optical fiber amplifier is connected with the electro-absorption modulator.
5. The tunable optical frequency comb generation device of claim 1, further comprising a spectrometer;
the spectrometer is connected with the electric absorption modulator and is used for displaying and storing the optical frequency comb.
6. The tunable optical frequency comb generation apparatus of claim 1, wherein the laser emitting assembly comprises a laser and a polarization controller connected in sequence;
the polarization controller is used for controlling the polarization direction of the first laser; the first laser is laser emitted by the laser.
7. A tunable optical frequency comb generation method, comprising:
setting a first radio frequency signal, a second radio frequency signal and a third radio frequency signal output by a first signal source component, and setting a fourth radio frequency signal output by a second signal source component; the third radio frequency signal is used for driving a phase modulator; the fourth radio frequency signal is used for adjusting the bias voltage of the electro-absorption modulator and driving the electro-absorption modulator;
according to the first radio frequency signal and the second radio frequency signal, adjusting the bias voltage of the dual-drive Mach-Zehnder modulator;
and emitting laser light through a laser emission component, and enabling the laser light to sequentially pass through the double-drive Mach-Zehnder modulator, the phase modulator and the electric absorption modulator so as to generate an optical frequency comb.
8. The method for generating a tunable optical frequency comb according to claim 7, wherein adjusting a bias voltage of the dual-drive mach-zehnder modulator according to the first radio frequency signal and the second radio frequency signal specifically comprises:
according to the formula
ΔA+Δθ＝π/2
Adjusting the bias voltage of the dual-drive Mach-Zehnder modulator;
wherein Δ a = (a) 1 -A 2 )/2，A 1 Representing the amplitude, A, of the first radio frequency signal 2 Represents the amplitude of the second radio frequency signal, Δ θ represents the phase difference of the bias voltage applied to the dual-drive mach-zehnder modulator, Δ θ = (θ) 1 -θ 2 )/2，θ 1 Representing the phase, theta, of a bias voltage applied to a first input terminal of a dual-drive Mach-Zehnder modulator 2 Representing the phase of the bias voltage applied to the second input of the dual-drive mach-zehnder modulator.
9. The tunable optical frequency comb generation method of claim 7, further comprising:
and after the laser sequentially passes through the double-drive Mach-Zehnder modulator and the phase modulator, obtaining a preliminary optical frequency comb, amplifying the preliminary optical frequency comb, and then conveying the amplified preliminary optical frequency comb to the electroabsorption modulator.
CN202210997388.1A 2022-08-19 2022-08-19 Tunable optical frequency comb generation device and method Pending CN115268117A (en)

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