CN112987442A - Broadband tunable optical frequency comb generation device and method - Google Patents
Broadband tunable optical frequency comb generation device and method Download PDFInfo
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- CN112987442A CN112987442A CN202110203878.5A CN202110203878A CN112987442A CN 112987442 A CN112987442 A CN 112987442A CN 202110203878 A CN202110203878 A CN 202110203878A CN 112987442 A CN112987442 A CN 112987442A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008878 coupling Effects 0.000 claims abstract description 42
- 238000010168 coupling process Methods 0.000 claims abstract description 42
- 238000005859 coupling reaction Methods 0.000 claims abstract description 42
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 230000005701 quantum confined stark effect Effects 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 5
- 210000001520 comb Anatomy 0.000 description 3
- 229940125730 polarisation modulator Drugs 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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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
- G02F1/17—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 based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169
- G02F1/174—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 based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169 based on absorption band-shift, e.g. Stark - or Franz-Keldysh effect
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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
- G02F2203/00—Function characteristic
- G02F2203/56—Frequency comb synthesizer
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Abstract
The invention discloses a broadband tunable optical frequency comb generation device and method in the technical field of photonics, and the device comprises: the device comprises a continuous light source, an electric absorption modulator, a radio frequency signal source, an electric power divider, a coupling operation circuit and an electric amplifier; the radio frequency signal source outputs a sinusoidal electric signal which is input into the coupling operation circuit through the electric power divider, generates an even-power radio frequency coupling signal, drives the electric absorption modulator after passing through the electric amplifier, and modulates the intensity and the phase of continuous light output by the continuous light source; the generated optical frequency comb has the characteristics of large number of comb lines, higher power flatness, wide coverage spectrum range, tunable comb line frequency interval and the like.
Description
Technical Field
The invention belongs to the technical field of photonics, and particularly relates to a broadband tunable optical frequency comb generation device and method.
Background
An optical frequency comb (optical comb for short) is a novel ideal carrier in a DWDM system (dense light wave multiplexing system), is a spectrum consisting of a series of discrete frequency components at uniform intervals on a frequency spectrum, has the characteristics of approximately equal optical power between comb lines, equal frequency intervals, more comb lines and the like, and is widely applied to the fields of optical arbitrary waveform generation, microwave photon signal processing, precise optical measurement, dense wavelength division multiplexing and the like.
The existing optical comb generation methods mainly include a mode-locked laser method, a nonlinear optical fiber method, a micro-ring resonant cavity 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. The OFC generated by the external modulator method is used for generating comb lines by driving the modulator through Radio Frequency (RF) signals, and has the advantages of stable output frequency spectrum, adjustable frequency interval between the comb lines, simple structure, flexible operation and the like. 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).
Specifically, the method for generating the optical comb based on the external modulator mainly comprises the following steps: the PolM is driven by using RF, input laser is modulated into a comb spectrum, and then a separated optical sideband with lower optical power is properly compensated by a polarization beam splitter to generate an optical comb; a single RF is used for driving an MZM to modulate single-wavelength input light, and the power flatness is optimized by adjusting the phase of a radio frequency signal and a direct current bias voltage to generate an optical comb; generating a multi-frequency driving signal by superposing two RF with different frequencies, and then driving a single IM to generate an optical comb; the input laser is modulated under a single RF drive using the cascading action of the EAM and the PM, creating an optical frequency comb, etc.
However, in the existing schemes for generating optical frequency combs based on the external modulator method, the single RF or the superposition of multiple RFs is used to drive the single external modulator, so that the generated comb lines are fewer in number or higher in cost. The approach of using cascaded modulators in turn increases the cost and complexity of the system. Therefore, how to simplify the optical frequency comb generation device, it is important to develop a high-quality OFC with a large number of generated comb lines, a wide frequency spectrum range, a high flatness of comb line power, and a tunable frequency interval.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a broadband tunable optical frequency comb generation device and method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a broadband tunable optical frequency comb generation apparatus, comprising: the device comprises a continuous light source, an electric absorption modulator, a radio frequency signal source, an electric power divider, a coupling operation circuit and an electric amplifier; the radio frequency signal source outputs a sine electric signal which is input into the coupling operation circuit through the electric power divider, generates an even-power radio frequency coupling signal, drives the electric absorption modulator after passing through the electric amplifier, and modulates the intensity and the phase of continuous light output by the continuous light source.
Further, the coupled arithmetic circuit includes a squaring circuit and an electrical multiplier.
Further, the continuous light source is a continuous laser, and the radio frequency signal source is a continuous radio frequency signal generator.
Further, the electroabsorption modulator comprises a quantum confined stark effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
A method of generating a broadband tunable optical frequency comb, comprising: setting the frequency and amplitude of a radio frequency signal source, wherein a sinusoidal electric signal sent by the radio frequency signal source generates a radio frequency coupling signal of an even power through an electric power divider and a coupling operation circuit; the radio frequency coupling signal passes through the electric amplifier and then drives and controls the electric absorption modulator; the continuous light source outputs single-wavelength continuous light to the electro-absorption modulator, and the input light is modulated in intensity and phase under the drive of the radio frequency coupling signal to generate a flat optical frequency comb with the frequency interval of 2 times the frequency of the radio frequency signal source.
Further, the continuous light source is a continuous laser, and the radio frequency signal source is a continuous radio frequency signal generator.
Further, the electroabsorption modulator comprises a quantum confined stark effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, after RF passes through an arithmetic circuit consisting of a squaring circuit and an electric multiplier, generated even power radio frequency coupling signals drive an electric absorption modulator, so that the intensity and the phase of input light are modulated, and a flat comb line is generated; the low-frequency RF is utilized to generate multi-frequency driving signals of even power through the coupling arithmetic circuit, the method for generating the multi-frequency driving signals by utilizing a plurality of high-cost high-frequency radio frequency sources can be replaced, the cost of an OFC generating device is reduced, the tunable comb line interval can be realized by changing the frequency of the RF, the comb line interval for generating the optical comb is 2 times of the RF output frequency, and the spectral bandwidth of the optical frequency comb is effectively expanded;
(2) the device has simple structure and easy realization, generates more optical combs, has higher power flatness, tunable comb line frequency interval and wide frequency spectrum coverage range, and can be applied to optical communication systems with large capacity and high speed.
Drawings
Fig. 1 is a schematic structural diagram of a broadband tunable optical frequency comb generating device according to an embodiment of the present invention;
FIG. 2 is a diagram of a 10 th power coupling operation circuit according to an embodiment of the present invention;
FIG. 3 is a graph of the spectrum of a 10 th power RF coupled signal at an RF output frequency of 7.5GHz in accordance with an embodiment of the invention;
FIG. 4 is a diagram of an optical frequency comb spectrum with a frequency interval of 15GHz output by the electro-absorption modulator driven by a 10-th power RF coupling signal according to an embodiment of the present invention;
FIG. 5 is a diagram of an optical frequency comb spectrum with a frequency interval of 20GHz output by the electro-absorption modulator driven by a 10-th power RF coupling signal according to an embodiment of the present invention;
in the figure: 1. a radio frequency signal source; 2. an electric power divider; 3. a coupling arithmetic circuit; 4. an electrical amplifier; 5. a continuous light source; 6. an electroabsorption modulator; 7. a spectrometer.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1, a broadband tunable optical frequency comb generation device includes a radio frequency signal source 1, an electrical splitter 2, a coupling operation circuit 3, an electrical amplifier 4, a continuous light source 5, an electro-absorption modulator 6, and a spectrometer 7; the radio frequency signal source 1 outputs sine electric signals which are input into a coupling operation circuit 3 consisting of a squaring circuit and an electric multiplier through an electric power divider 2, and radio frequency coupling signals of even power are generated. The radio frequency coupling signal is transmitted to the electro-absorption modulator 6 through the electrical amplifier 4, and the electro-absorption modulator 6 modulates the intensity and the phase of the input light due to the driving of the radio frequency coupling signal of the even power, so that more frequency components can be observed in the spectrometer 7, and the optical frequency comb with high power flatness, a large number of comb lines and tunable frequency interval is obtained. The radio frequency signal source 1 is a continuous radio frequency signal generator; the continuous light source 5 is a continuous laser; the electro-absorption modulator 6 is a quantum confined Stark effect electro-absorption modulator (QCSE-EAM) or a multiple quantum well electro-absorption modulator (MQW-EAM).
Preliminarily setting the laser center frequency output by the continuous laser to be 193.1THz, the line width to be 10MHz and the optical power to be 0 dBm; the RF output amplitude is 2V, the frequency is the sinusoidal electric signal of 7.5 GHz; the gain factor of the electrical amplifier 4 is 1; the modulation factor of the electro-absorption modulator 6 is 0.99 and the chirp factor is 16.
The signal output by the radio frequency signal source 1 is multiply coupled by 10 times by using the coupling arithmetic circuit 3, the sinusoidal electric signal output by the radio frequency signal source 1 is divided into an upper branch and a lower branch by an electric power divider, the upper branch signal generates a radio frequency signal of 8 times by 3 square circuits, the lower branch generates a radio frequency signal of 2 times by 1 square circuit, the upper branch and the lower branch generate a radio frequency coupling signal of 10 times by multiplication coupling by an electric multiplier, and the 10-time coupling arithmetic circuit is shown in fig. 2. The 10 th power radio frequency coupled signal is generated to have a plurality of frequency components in the electrical domain, as shown in fig. 3, and in particular, fig. 3 shows a 10 th power radio frequency coupled signal spectrum diagram at an RF output frequency of 7.5 GHz. Continuous light output by the continuous light source 5 is injected into the electro-absorption modulator 6, and the electro-absorption modulator 6 generates an optical frequency comb with a comb line number of 55, a frequency interval of 15GHz, a spectral bandwidth of 810GHz, and a power flatness of 8.4dB under the driving of a radio frequency coupling signal of 10 times, as shown in fig. 4. By increasing the RF output frequency to 10GHz, the electro-absorption modulator 6 produces an optical frequency comb with a comb line count of 55, a frequency spacing of 20GHz, a spectral bandwidth of 1080GHz, and a power flatness of 8.4dB, as shown in fig. 5.
In summary, in the present embodiment, after RF passes through an arithmetic circuit composed of a squaring circuit and an electrical multiplier, the generated even power RF coupling signal drives the electro-absorption modulator, so as to modulate the intensity and phase of the input light, and generate a flat comb line; the low-frequency RF is utilized to generate multi-frequency driving signals of even power through the coupling arithmetic circuit, the method for generating the multi-frequency driving signals by utilizing a plurality of high-cost high-frequency radio frequency sources can be replaced, the cost of an OFC generating device is reduced, the tunable comb line interval can be realized by changing the frequency of the RF, the comb line interval for generating the optical comb is 2 times of the RF output frequency, and the spectral bandwidth of the optical frequency comb is effectively expanded; the device of the embodiment has the advantages of simple structure, easy realization, more generated optical combs, higher power flatness, tunable comb line frequency interval and wide frequency spectrum coverage range, and can be applied to optical communication systems with large capacity and high speed.
Example two:
based on the broadband tunable optical frequency comb generating device according to the first embodiment, the present embodiment provides a broadband tunable optical frequency comb generating method, including the following steps:
setting the frequency and amplitude of a radio frequency signal source 1, wherein a sinusoidal electric signal sent by the radio frequency signal source generates a radio frequency coupling signal of an even power through a power divider 2 and a coupling operation circuit 3;
secondly, the radio frequency coupling signal passes through the electric amplifier 4 and then drives and controls the electric absorption modulator 6;
and thirdly, outputting single-wavelength continuous light from a continuous light source 5 to an electro-absorption modulator 6, and modulating the intensity and the phase of the input light under the driving of a radio frequency coupling signal to generate a flat optical frequency comb with the frequency interval of 2 times of the frequency of a radio frequency signal source.
The driving signal for driving the electroabsorption modulator 6 to generate the flat optical frequency comb can be a radio frequency coupling signal of 10 power, and according to the power reduction formula of the trigonometric function, the radio frequency coupling signal can be equivalently expressed into 5 radio frequency coupling signals with different amplitudes and frequencies of 2 respectivelyf c 、4fc、6fc、8fcAnd 10fcThe sinusoidal radio frequency signal of (1) is superposed, and an optical comb generated by EAM is equivalent to 5 sets of frequency intervals of 2f c 、4fc、6fc、8fcAnd 10fcStacking the optical comb spectra. Thereby producing a higher flatness with a frequency spacing of 2f c The optical frequency comb of (1).
Modulation index and chirp factor of the electro-absorption modulator 6 and modulation voltage of the electro-absorption modulator 6V pulse And bias voltageV bias The modulation index and the chirp factor are changed by adjusting the modulation voltage and the bias voltage, so that different intensity and phase modulation effects on input light can be achieved, and the generated optical frequency comb has more comb line number and better power flatness.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A broadband tunable optical frequency comb generation apparatus, comprising: the device comprises a continuous light source, an electric absorption modulator, a radio frequency signal source, an electric power divider, a coupling operation circuit and an electric amplifier; the radio frequency signal source outputs a sine electric signal which is input into the coupling operation circuit through the electric power divider, generates an even-power radio frequency coupling signal, drives the electric absorption modulator after passing through the electric amplifier, and modulates the intensity and the phase of continuous light output by the continuous light source.
2. A wideband tunable optical frequency comb generation device as claimed in claim 1, wherein the coupled operational circuit comprises a squaring circuit and an electrical multiplier.
3. A wideband tunable optical frequency comb generation device as claimed in claim 1, wherein the continuous light source is a continuous laser and the rf signal source is a continuous rf signal generator.
4. A broadband tunable optical frequency comb generation device according to claim 1, wherein the electroabsorption modulator comprises a quantum confined stark effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
5. A method of generating a broadband tunable optical frequency comb, comprising:
setting the frequency and amplitude of a radio frequency signal source, wherein a sinusoidal electric signal sent by the radio frequency signal source generates a radio frequency coupling signal of an even power through an electric power divider and a coupling operation circuit;
the radio frequency coupling signal passes through the electric amplifier and then drives and controls the electric absorption modulator;
the continuous light source outputs single-wavelength continuous light to the electro-absorption modulator, and the input light is modulated in intensity and phase under the drive of the radio frequency coupling signal to generate a flat optical frequency comb with the frequency interval of 2 times the frequency of the radio frequency signal source.
6. The method of claim 5, wherein said continuous light source is a continuous laser and said RF signal source is a continuous RF signal generator.
7. A method of generating a broadband tunable optical frequency comb according to claim 5, wherein the electro-absorption modulator comprises a quantum confined Stark effect electro-absorption modulator or a multiple quantum well electro-absorption modulator.
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- 2021-02-24 CN CN202110203878.5A patent/CN112987442A/en active Pending
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