CN102662250B - Light intensity equalizer - Google Patents
Light intensity equalizer Download PDFInfo
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- CN102662250B CN102662250B CN201210114180.7A CN201210114180A CN102662250B CN 102662250 B CN102662250 B CN 102662250B CN 201210114180 A CN201210114180 A CN 201210114180A CN 102662250 B CN102662250 B CN 102662250B
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Abstract
The invention discloses a light intensity equalizer. The light intensity equalizer comprises a polarization beam splitter, a polarization rotator, a Faraday rotation mirror and a phase modulator. The polarization beam splitter receives and outputs first polarized light in a first polarization direction. The polarization rotator transfers the first polarized light into second polarized light. A second polarization direction is perpendicular to the first polarization direction. The second polarized light has polarization components in the first polarization direction and the second polarization direction. The Faraday rotation mirror reflects the second polarized light and the phase modulator carries out phase modulation to the second polarized light twice. The polarization rotator transfers the modulated second polarized light into third polarized light. The polarization beam splitter outputs the polarization component of the third polarized light in the second polarization direction as output light. Due to nonreciprocity of the Faraday rotation mirror, polarization mode dispersion introduced by each optical device is offset. The light intensity equalizer is irrelevant to wavelength and insensitive to environmental change.
Description
Technical field
The present invention relates to optical field, particularly relate to a kind of light intensity equalizer.
Background technology
At present, Mach-zehnder type light intensity modulator adopts optical waveguide technique on lithium columbate crystal, to produce Mach-Zehnder interference ring.Its principle of work is to utilize the optical path difference of electrooptical effect change interference ring two arms of lithium columbate crystal, controls the light intensity of interference ring output light by interference of light.For Mach-zehnder type light intensity modulator, output light is determined by interference ring two arm optical path differences with the beam intensity ratio (that is, intensity modulated ratio) of input light.Because lithium columbate crystal exists dispersion, the optical path difference that the light of different wave length obtains through light intensity modulator is different, and correspondingly, intensity modulated is than also different.The characteristic of this intensity modulated comparison optical wavelength sensitivity can cause: when the line width of input light is wider, cannot obtain High Extinction Ratio; When input light wavelength changes, for obtaining constant output light light intensity, must adjust accordingly the driving signal of light intensity modulator.
In addition, the intensity modulated of Mach-zehnder type light intensity modulator is than except to wavelength sensitive, also for example, to external environment condition (, temperature, vibration etc.) sensitivity.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of light intensity equalizer, compares the defect of wavelength sensitive to solve the intensity modulated of the Mach-zehnder type light intensity modulator of prior art.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of light intensity equalizer is provided, comprises polarization beam apparatus, polarization rotator, faraday rotator mirror and phase-modulator.The first port of polarization beam apparatus receives the First Line polarized light of the first polarization direction, and the second port output from polarization beam apparatus by First Line polarized light.Polarization rotator is for converting the First Line polarized light of the second port output of polarization beam apparatus to all have polarized component on the first polarization direction and the second polarization direction perpendicular to the first polarization direction the second polarized light.Faraday rotator mirror is for being reflected back polarization rotator by the second polarized light of polarization rotator output.Phase-modulator is arranged between polarization rotator and faraday rotator mirror, be used for the phase place between the polarized component on the first polarization direction and the second polarization direction to the second polarized light of polarization rotator output and carry out phase-modulation one time, and the phase place between the polarized component on the first polarization direction and the second polarization direction is carried out quadratic phase modulation to the second polarized light of faraday rotator mirror reflection
Wherein, only to the second polarized light, the polarized component on the first polarization direction plays phase-modulation effect to light intensity equalizer.Polarization rotator further changes into the 3rd polarized light by the second polarized light after quadratic phase modulation, and exporting the second port of polarization beam apparatus to, polarization beam apparatus is the 3rd port output using the polarized component of the 3rd polarized light on the second polarization direction as output light from polarization beam apparatus further.Wherein, the light intensity of output light is determined by following formula:
Wherein, I
outfor the light intensity of output light, I
infor the light intensity of First Line polarized light, the loss factor that η is light intensity equalizer, α is the phase change amount of a phase-modulation introducing, and β is the phase change amount that quadratic phase modulation is introduced.
Wherein, described the 3rd polarized light is linearly polarized light, and relative the first polarization direction, polarization direction is the predetermined angle of non-zero.
Wherein, the second polarized light is that stokes parameter S1 is zero polarized light.
Wherein, the second polarized light is circularly polarized light or 45 degree polarized lights.
Wherein, the second polarized light is elliptically polarized light.
Wherein, the first polarization direction is horizontal polarization direction, and the second polarization direction is vertical polarization.
Wherein, polarization rotator is the turn clockwise half-wave plate of 45 degree of optical axis relative level polarization direction.
Wherein, the second polarized light is right-circularly polarized light.
By the way, light intensity equalizer of the present invention utilizes polarization rotator the linearly polarized light of the first polarization direction to be converted to the second polarized light that all has polarized component on the first polarization direction and the second polarization direction perpendicular to the first polarization direction, utilize faraday rotator mirror to reflect this second polarized light, utilize phase-modulator to carry out phase-modulation twice to the second polarized light simultaneously.Due to the nonreciprocity of faraday rotator mirror, in above-mentioned light intensity modulator, the polarization mode dispersion that each optical device is introduced is cancelled.Therefore, above-mentioned light intensity modulator has with Wavelength-independent, to the insensitive characteristic of environmental change.Utilize above-mentioned light intensity modulator, can carry out intensity modulation to the wide input light of line width, obtain High Extinction Ratio.
Accompanying drawing explanation
Fig. 1 is according to the schematic block diagram of the light intensity equalizer of one embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Refer to Fig. 1, Fig. 1 is according to the schematic block diagram of the light intensity equalizer of the first embodiment of the present invention.As shown in Figure 1, light intensity equalizer of the present invention mainly comprises polarization beam apparatus 11, polarization rotator 12, phase-modulator 13 and faraday rotator mirror 14.
The first port A of polarization beam apparatus 11 receives the First Line polarized light of the first polarization direction, and the second port B output from polarization beam apparatus 11 by First Line polarized light.In the present embodiment, the first polarization direction is horizontal polarization direction, and corresponding Jones's vector is [1,0]
t, wherein T is matrix transpose.Polarization beam apparatus 11 is arranged to the incident light of transmission level polarization direction, and the incident light of reflection vertical polarization.Therefore, First Line polarized light is exported by the second port B relative with the first port A after polarization beam apparatus 11 transmissions.In other embodiments, the first polarization direction can be also vertical polarization.In addition, polarization beam apparatus 11 also can be arranged to the incident light of reflection levels polarization direction, and the incident light of transmission vertical polarization.Certainly, as understood by those skilled in the art, the first polarization direction can be also to carry out other separated arbitrary polarized directions of space by polarization beam apparatus 11 and the second perpendicular polarization direction.
In the present embodiment, polarization rotator 12 can be the turn clockwise half-wave plate of 45 degree of optical axis relative level polarization direction, converts First Line polarized light to right-circularly polarized light thus, and corresponding Jones's vector is
the phase place that wherein i is pi/2.
Phase-modulator 13 is arranged between polarization rotator 12 and faraday rotator mirror 14.Phase place between the polarized component of the second polarized light of 13 pairs of polarization rotators of phase-modulator, 12 outputs on the first polarization direction and the second polarization direction is carried out phase-modulation one time.In the present embodiment, 13 of phase-modulators have phase-modulation effect to the polarized component on the first polarization direction, and in a phase-modulation process, the phase change amount of the polarized component on 13 pairs of the first polarization directions of phase-modulator is α.
The second polarized light after a phase-modulation further incides faraday rotator mirror 14.Faraday rotator mirror 14 is reflected back polarization rotator 12 by this second polarized light.Now, the phase place between the polarized component of the second polarized light of 13 pairs of faraday rotator mirrors of phase-modulator, 14 reflections on the first polarization direction and the second polarization direction is carried out quadratic phase modulation.In the present embodiment, 13 of phase-modulators have phase-modulation effect to the polarized component on the first polarization direction, and in quadratic phase modulated process, the phase change amount of the polarized component on 13 pairs of the first polarization directions of phase-modulator is β.Now, in the present embodiment, corresponding Jones's vector of the second polarized light after quadratic phase modulation is
The second polarized light after quadratic phase modulation is further incided to polarization rotator 12, by polarization rotator 12, change into the 3rd polarized light, and export the second port B of polarization beam apparatus 11 to.In the present embodiment, the 3rd polarized light of polarization rotator 12 outputs is linearly polarized light, and its Jones's vector is
Due to twice phase-modulation through phase-modulator 13, relative first polarization direction, polarization direction of the 3rd polarized light is the predetermined angle of non-zero.Therefore there is certain polarized component in the 3rd polarized light, on the second polarization direction.The phase change amount that the size of this polarized component is introduced by phase-modulator 13 determines.Polarization beam apparatus 11 is the 3rd port C output using the polarized component of the 3rd polarized light on the second polarization direction as output light from polarization beam apparatus 11 further.Certainly, further the first port A output from polarization beam apparatus 11 by the polarized component of the 3rd polarized light on the first polarization direction of polarization beam apparatus 11.In the present embodiment, the light intensity of output light is determined by following formula:
Wherein, I
outfor the light intensity of output light, I
infor the light intensity of First Line polarized light, the loss factor that η is light intensity equalizer, α is the phase change amount of a phase-modulation introducing, and β is the phase change amount that quadratic phase modulation is introduced.
By the way, light intensity equalizer of the present invention utilizes polarization rotator the linearly polarized light of the first polarization direction to be converted to the second polarized light that all has polarized component on the first polarization direction and the second polarization direction perpendicular to the first polarization direction, utilize faraday rotator mirror to reflect this second polarized light, utilize phase-modulator to carry out phase-modulation twice to the second polarized light simultaneously.Due to the nonreciprocity of faraday rotator mirror, in above-mentioned light intensity modulator, the polarization mode dispersion that each optical device is introduced is cancelled.Therefore, above-mentioned light intensity modulator has with Wavelength-independent, to the insensitive characteristic of environmental change.Utilize above-mentioned light intensity modulator, can carry out intensity modulation to the wide input light of line width, obtain High Extinction Ratio.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. a light intensity equalizer, is characterized in that, comprising:
Polarization beam apparatus, the first port of described polarization beam apparatus receives the First Line polarized light of the first polarization direction, and the second port output from described polarization beam apparatus by described First Line polarized light;
Polarization rotator, for converting the described First Line polarized light of the described second port output of described polarization beam apparatus to all have polarized component on described the first polarization direction and the second polarization direction perpendicular to described the first polarization direction the second polarized light;
Faraday rotator mirror, for being reflected back described polarization rotator by described second polarized light of described polarization rotator output;
Phase-modulator, be arranged between described polarization rotator and described faraday rotator mirror, be used for the phase place between the polarized component on described the first polarization direction and described the second polarization direction to described second polarized light of described polarization rotator output and carry out phase-modulation one time, and the phase place between the polarized component on described the first polarization direction and described the second polarization direction is carried out quadratic phase modulation to described second polarized light of described faraday rotator mirror reflection
Wherein, only to described the second polarized light, the polarized component on described the first polarization direction plays phase-modulation effect to described light intensity equalizer, described polarization rotator further changes into the 3rd polarized light by described the second polarized light after quadratic phase modulation, and export the second port of described polarization beam apparatus, the further three port output of the polarized component on described the second polarization direction as output light from described polarization beam apparatus using described the 3rd polarized light of described polarization beam apparatus to; The light intensity of described output light is determined by following formula:
Wherein, I
outfor the light intensity of described output light, I
infor the light intensity of described First Line polarized light, the loss factor that η is described light intensity equalizer, α is the phase change amount of a phase-modulation introducing, and β is the phase change amount that quadratic phase modulation is introduced.
2. light intensity equalizer according to claim 1, is characterized in that, described the 3rd polarized light is linearly polarized light, and relatively described the first polarization direction, polarization direction is the predetermined angle of non-zero.
3. light intensity equalizer according to claim 1, is characterized in that, described the second polarized light is that stokes parameter S1 is zero polarized light.
4. light intensity equalizer according to claim 1, is characterized in that, described the second polarized light is circularly polarized light or 45 degree polarized lights.
5. light intensity equalizer according to claim 1, is characterized in that, described the second polarized light is elliptically polarized light.
6. light intensity equalizer according to claim 1, is characterized in that, described the first polarization direction is horizontal polarization direction, and described the second polarization direction is vertical polarization.
7. light intensity equalizer according to claim 6, is characterized in that, described polarization rotator is the turn clockwise half-wave plate of 45 degree of the relatively described horizontal polarization direction of optical axis.
8. light intensity equalizer according to claim 7, is characterized in that, described the second polarized light is right-circularly polarized light.
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| CN103197431B (en) * | 2013-03-29 | 2015-04-08 | 光库通讯(珠海)有限公司 | Optical fiber coupler |
| CN106646928A (en) * | 2016-10-28 | 2017-05-10 | 京东方科技集团股份有限公司 | Anti-dazzling device and control method thereof |
| CN110149153B (en) * | 2018-02-13 | 2020-12-01 | 华为技术有限公司 | Optical modulator, modulation method and optical modulation system |
| CN110262054B (en) * | 2019-06-26 | 2021-09-07 | 中国空间技术研究院 | Broadband high-resolution large-dynamic-range delay compensation system and method |
| CN112383359B (en) * | 2021-01-15 | 2021-04-16 | 中国工程物理研究院激光聚变研究中心 | Multi-stage phase modulation system |
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| HU0700132D0 (en) * | 2007-02-06 | 2007-05-02 | Bayer Innovation Gmbh | Phase modulator system comprising a beam splitter and a linear polarisation mode phase modulator and method for separating a light beam travelling toward and reflected back from such a phase modulator |
| CN101871788B (en) * | 2010-06-04 | 2012-05-23 | 北京高光科技有限公司 | Distributed polarization crosstalk method and device for measuring polarization-preserving fiber and birefringent medium |
| CN102183849A (en) * | 2011-05-26 | 2011-09-14 | 北京邮电大学 | High-speed and high-precision all-fiber polarization control device |
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