CN111290041A - Method and device for suppressing intensity noise of light source by utilizing proportional compensation of electro-optic modulator - Google Patents
Method and device for suppressing intensity noise of light source by utilizing proportional compensation of electro-optic modulator Download PDFInfo
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Abstract
The invention discloses a method and a device for suppressing intensity noise of a light source by utilizing proportional compensation of an electro-optic modulator. The light beam splitting device is used for splitting the light source output in proportion to form a pair of high-power light beams and low-power light beams, the high-power light beams are sampled to obtain light intensity fluctuation information, a modulation signal is loaded to the electro-optical modulator through the signal processing module to modulate the light intensity fluctuation of the low-power light beams to generate light signals which have the same intensity as the high-power light beams and have the phase difference of 180 degrees, and finally the light signals are combined with the high-power light beams to be output, so that the effect of restraining the light intensity fluctuation of output light is achieved. The invention overcomes the defect of low power threshold of the electro-optical modulator, realizes the suppression of the intensity noise of the high-power laser, and has low cost and easy application and implementation.
Description
Technical Field
The invention relates to a method and a device for reducing intensity noise of a light source, in particular to a method and a device for reducing intensity noise of a light source by compensating light intensity fluctuation by using an electro-optical modulator.
Background
According to the photoelectric detection theory, when the photoelectric detector receives an optical signal input and converts an electrical signal output, two noise sources mainly exist. One is shot noise of the photodetector. Due to the particle nature of light, the number of electrons emitted by the detector randomly fluctuates around a statistical average, even though the average intensity of the incident light is constant. The shot noise power spectral density is proportional to the light source power P, as follows:
in the formula (I), the compound is shown in the specification,
is the average optical power of the incident light,his the constant of the planck, and,cis the speed of light in vacuum and λ is the source wavelength.
The other noise source is light source relative intensity noise which mainly comes from intensity fluctuation of an incident light field, and the noise power spectral density is in direct proportion to the square of the light source power, so that the following conditions are met:
in the formula, Δ λ is a spectral width of the light source.
Since the power of the light source relative intensity noise is proportional to the square of the power of the light source, and the power of the shot noise is proportional to the power of the light source, when the power of the light source is gradually increased, the light source relative intensity noise often exceeds the shot noise and becomes a main factor influencing the accuracy of the photoelectric detection system. The suppression of the relative intensity noise of the light source has important significance on the improvement of the system performance.
Light source intensity noise suppression is generally classified into outer modulation and inner modulation. Wherein the internal modulation is achieved by pump gain modulation and intra-cavity loss modulation within the laser. Generally, the internal structure of the laser is not involved in laser application, so that the external modulation scheme is mostly adopted for suppressing the intensity noise of the light source. The suppression scheme of the external modulation light source intensity noise mainly comprises a mode cleaner method, a semiconductor optical amplifier saturation suppression method, a photoelectric feedback method and the like. The pattern cleaner method has a significant effect of suppressing intensity noise, but has a limited effect of suppressing intensity noise in a low frequency band. The semiconductor optical amplifier saturation suppression method is to suppress the intensity noise of a light source by using the gain saturation characteristic of an optical amplifier, but the semiconductor optical amplifier saturation suppression method is limited by the input optical power of the amplifier and cannot meet the high-power input requirement of an optical trap sensing system. The traditional photoelectric feedback method is to sample the output optical signal and feed the sampled output optical signal back to the acousto-optic modulator or the electro-optic modulator to adjust the optical power so as to achieve the effect of noise suppression, but the acousto-optic modulator has low response bandwidth and the electro-optic modulator has low optical power damage threshold, and is limited to a certain extent in the application of an optical trap sensing system.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method and a device for suppressing the intensity noise of a light source by utilizing the proportional compensation of an electro-optical modulator.
A method for utilizing the proportion compensation of an electro-optical modulator to inhibit the intensity noise of a light source adopts the proportion compensation based on the electro-optical modulator to inhibit the intensity noise of the light source, the output of the light source is split in proportion to form a pair of high-power light beams and low-power light beams, the high-power light beams are split and sampled to obtain light intensity fluctuation information, the light intensity fluctuation information is fed back to the electro-optical modulator of the low-power light beams, the intensity of the low-power light beams is modulated in proportion to generate optical signals which have the same intensity as the high-power light beams and are deflected by 180 degrees in phase, and finally the optical signals and the high-power.
The device for suppressing the intensity noise of the light source by using the proportional compensation of the electro-optical modulator comprises a light source, a first beam splitter, a second beam splitter, a beam combiner, a first reflector, the electro-optical modulator, a second reflector, a signal processing module and a photoelectric detector, wherein the first beam splitter is used for splitting the light source into a plurality of beams; light emitted by the light source is divided into a light beam A and a light beam B through the first spectroscope, the light beam A is stronger than the light beam B, the light beam B enters the electro-optical modulator through the first reflector, the light beam A is divided into a light beam C and a light beam D through the second spectroscope, the light beam C is stronger than the light beam D, the light beam D is connected to the photoelectric detector, an electric signal subjected to photoelectric conversion is connected to the signal processing module, the signal processing module outputs the electric signal to control the electro-optical modulator, and output light of the electro-optical modulator is combined with the light beam C in the beam combining mirror and output after being reflected by the.
The splitting ratio of the first light splitter is 1:99, and the splitting ratio of the second light splitter is 1: 99.
The light power of the emergent light of the electro-optical modulator isP 1 =P 01 +P n1 WhereinP 01 In order to be the average light power,P n1 the optical power of 99% end outgoing light of the second spectroscope is the light source power fluctuationP 2 =P 02 +P n2 WhereinP 02 In order to be the average light power,P n2 in order for the power of the light source to fluctuate,P n1 andP n2 in contrast, the amplitudes are the same, and are 180 ° out of phase, i.e. the phase difference isP n1 +P n2 =0。
The invention has the advantages of
The invention restrains the intensity noise of the light source based on the proportion compensation of the electro-optical modulator, overcomes the defect of low power threshold of the electro-optical modulator, can realize the light intensity fluctuation compensation of the high power end only by smaller light power at the low power end, realizes the intensity noise restraint of the high power laser, has low cost and is easy to apply and implement.
Drawings
FIG. 1 is a schematic diagram of the optical path of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the signal processing module of the apparatus of the present invention;
FIG. 3 is a schematic diagram of a high power beam and a low power beam;
FIG. 4 is a schematic diagram of superposition cancellation of light source intensity noise;
in the figure, a light source 1, a first beam splitter 2, a second beam splitter 3, a beam combiner 4, a first reflector 5, an electro-optical modulator 6, a second reflector 7, a signal processing module 8 and a photoelectric detector 9.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of the present invention is not limited to the following embodiments.
A method for utilizing the proportion compensation of an electro-optical modulator to inhibit the intensity noise of a light source adopts the proportion compensation based on the electro-optical modulator to inhibit the intensity noise of the light source, the output of the light source is split in proportion to form a pair of high-power light beams and low-power light beams, the high-power light beams are split and sampled to obtain light intensity fluctuation information, the light intensity fluctuation information is fed back to the electro-optical modulator of the low-power light beams, the intensity of the low-power light beams is modulated in proportion to generate optical signals which have the same intensity as the high-power light beams and are deflected by 180 degrees in phase, and finally the optical signals and the high-power. Because the light power fluctuation of the light source is smaller than the light source power by more than 2 magnitude, the light intensity fluctuation compensation of the high-power end can be realized only by smaller light power at the low-power end. The invention hopefully realizes the integral suppression of the intensity noise of the light source by improving the traditional photoelectric feedback method.
Examples
Referring to fig. 1, an apparatus for suppressing intensity noise of a light source by utilizing proportional compensation of an electro-optical modulator includes a light source 1, a first beam splitter 2, a second beam splitter 3, a beam combiner 4, a first reflector 5, an electro-optical modulator 6, a second reflector 7, a signal processing module 8, and a photodetector 9. Light emitted by the light source 1 is divided into a light beam A and a light beam B through the first spectroscope 2, the light beam A is stronger than the light beam B, the light beam B enters the electro-optical modulator 6 through the first reflector 5, the light beam A is divided into light beams C and D through the second spectroscope 3, the light beam C is stronger than the light beam D, the light beam D is connected with the photoelectric detector 9, an electric signal after photoelectric conversion is connected with the signal processing module 8, the signal processing module 8 outputs the electric signal to control the electro-optical modulator 6, and output light of the electro-optical modulator 6 is combined with the light beam C in the beam combining mirror 4 and output after being reflected by the second reflector 7.
The splitting ratio of the first beam splitter 2 is 1:99, the splitting ratio of the second beam splitter 3 is 1:99, 1% of output light of the first beam splitter 2 is incident to the electro-optical modulator 6 after passing through the first reflector 5, 1% of output light of the second beam splitter 3 is incident to the sub-photoelectric detector 9, and signal acquisition and processing are carried out by the signal processing module 8 after photoelectric conversion. Referring to fig. 2, the signal processing module collects the output of the photodetector 9 through the AD, performs signal processing by the on-chip program of the FPGA board, generates a control signal, outputs the control signal to the electro-optical modulator 6 through the DA, and adjusts parameters such as time delay and amplitude of the input light. Referring to FIG. 3, the light power of the emergent light of the electro-optical modulator 6 isP 1 =P 01 +P n1 WhereinP 01 In order to be the average light power,P n1 for the fluctuation of the light source power, the light power of 99% end outgoing light of the second spectroscope 3 isP 2 =P 02 +P n2 WhereinP 02 In order to be the average light power,P n2 is the light source power fluctuation. With reference to figure 4 of the drawings,P n1 andP n2 the amplitudes are the same, and the phase difference is 180 degrees, namelyP n1 +P n2 And =0, the optical power fluctuation is cancelled out after the beam combining by the beam combining mirror, and the light source intensity noise of the output light is suppressed. Because the light power fluctuation of the light source is smaller than the light source power by more than 2 magnitude, the light intensity fluctuation compensation of the high-power end can be realized only by smaller light power at the low-power end, and the high-power light is prevented from directly entering the electro-optical modulator.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for utilizing the proportion compensation of an electro-optical modulator to restrain the intensity noise of a light source is characterized in that the proportion compensation based on the electro-optical modulator is adopted to restrain the intensity noise of the light source, the output of the light source is split in proportion to form a pair of high-power light beams and low-power light beams, the high-power light beams are split and sampled to obtain light intensity fluctuation information, the light intensity fluctuation information is fed back to the electro-optical modulator of the low-power light beams, the intensity of the low-power light beams is modulated in proportion to generate light signals which have the same intensity as the high-power light beams and are deflected by 180 degrees in phase, and the light signals and the high-power.
2. An apparatus for suppressing intensity noise of a light source using proportional compensation of an electro-optic modulator according to the method of claim 1, wherein: the device comprises a light source, a first beam splitter, a second beam splitter, a beam combiner, a first reflector, an electro-optical modulator, a second reflector, a signal processing module and a photoelectric detector; light emitted by the light source is divided into a light beam A and a light beam B through the first spectroscope, the light beam A is stronger than the light beam B, the light beam B enters the electro-optical modulator through the first reflector, the light beam A is divided into a light beam C and a light beam D through the second spectroscope, the light beam C is stronger than the light beam D, the light beam D is connected to the photoelectric detector, an electric signal subjected to photoelectric conversion is connected to the signal processing module, the signal processing module outputs the electric signal to control the electro-optical modulator, and output light of the electro-optical modulator is combined with the light beam C in the beam combining mirror and output after being reflected by the.
3. The apparatus of claim 2, wherein: the splitting ratio of the first light splitter is 1:99, and the splitting ratio of the second light splitter is 1: 99.
4. The apparatus of claim 2, wherein: the light power of the emergent light of the electro-optical modulator isP 1 =P 01 +P n1 WhereinP 01 In order to be the average light power,P n1 the optical power of 99% end outgoing light of the second spectroscope is the light source power fluctuationP 2 =P 02 +P n2 WhereinP 02 In order to be the average light power,P n2 in order for the power of the light source to fluctuate,P n1 andP n2 in contrast, the amplitudes are the same, and are 180 ° out of phase, i.e. the phase difference isP n1 +P n2 =0。
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| CN111934772A (en) * | 2020-07-24 | 2020-11-13 | 中山水木光华电子信息科技有限公司 | Optical fiber code identification system and method based on differential automatic noise elimination |
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