CN112713940B - Optical fiber array type retro-reflector - Google Patents

Optical fiber array type retro-reflector Download PDF

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Publication number
CN112713940B
CN112713940B CN202011580688.7A CN202011580688A CN112713940B CN 112713940 B CN112713940 B CN 112713940B CN 202011580688 A CN202011580688 A CN 202011580688A CN 112713940 B CN112713940 B CN 112713940B
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retro
optical fiber
reflection
reflector
array type
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CN112713940A (en
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许锐
杨国伟
毕美华
周雪芳
卢旸
胡淼
李齐良
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/548—Phase or frequency modulation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention discloses an optical fiber array type retro-reflector, which comprises optical fibers; aligning and arranging two ends of the optical fiber side by side to obtain a retro-reflection optical fiber; combining a plurality of retro-reflection optical fibers to obtain a retro-reflection optical fiber unit; and arranging the plurality of retro-reflection optical fiber units to obtain the optical fiber array type retro-reflector. The invention can realize the pseudo-phase conjugate echo of the incident light wave and is used for greatly inhibiting the influence of atmospheric turbulence on the disturbance of the light wave phase in the retro-reflection free space optical communication. Meanwhile, the access optical fiber modulator can solve the problem that the MRR modulation rate formed by a micro-cone reflector array and a spatial light modulator is low, and greatly improves the communication rate.

Description

Optical fiber array type retro-reflector
Technical Field
The invention relates to the technical field of optical communication, in particular to an optical fiber array type retro-reflector.
Background
Free space laser communication (FSO) is regarded as a key technology of high-speed wireless communication, but a space node needs to be configured with a high-precision capturing, aligning and tracking system to establish a bidirectional FSO link, and in order to solve the increase of the size, weight and power consumption of an FSO terminal, researchers have proposed a retro-reflection FSO system based on a retro-modulator, wherein a general retro-modulator consists of a pyramid reflector and a spatial light modulator, wherein the pyramid reflector can realize 180-degree retro-reflection of a light wave, and the spatial light modulator realizes modulation of the light wave. A retro-modulator using a single corner cube reflector with a spatial light modulator typically can only achieve communication distances of several kilometers. The size of the pyramid reflector unit is reduced to a sub-millimeter level, and the constructed micro-pyramid reflector array can become a pseudo-phase conjugate device which has distortion phase compensation capability very close to a real phase conjugate mirror. Since the inverse modulator based on the micro-pyramid reflector array needs to use the spatial light modulator to modulate light waves, but the modulation rate of the spatial light modulator is very low, the communication rate of the retro-reflection FSO system is greatly limited, and the practical application of the system is hindered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fiber array type retro-reflector.
In order to achieve the purpose, the invention adopts the following technical scheme:
an optical fiber array type retro-reflector includes an optical fiber; aligning and arranging two ends of the optical fiber side by side to obtain a retro-reflection optical fiber; combining a plurality of retro-reflection optical fibers to obtain a retro-reflection optical fiber unit; and arranging the plurality of retro-reflection optical fiber units to obtain the optical fiber array type retro-reflector.
Furthermore, each end face of the retro-reflection optical fiber is provided with light waves incident and emergent.
Furthermore, the end faces of the retro-reflection optical fibers are positioned on the same plane, and the bending angle of the optical fibers is 180 degrees, so that incident light waves are retro-reflected.
Furthermore, the plurality of retro-reflection optical fibers are combined in different arrangement modes to obtain a retro-reflection optical fiber unit with the diameter smaller than a millimeter level, so that the wave front of the incident light wave rotates around the center of the retro-reflection optical fiber unit for 180-degree emergence to form an approximate conjugate echo in a micro area.
Furthermore, the plurality of retro-reflection optical fiber units are arranged to realize the pseudo-phase conjugate echo of the incident light wave and compensate the phase distortion of the light wave caused by the turbulent medium.
Correspondingly, a modulation method of the optical fiber array type retro-reflector is further provided, and the method comprises the step of connecting an optical fiber modulator in a retro-reflection optical fiber to realize the modulation of the optical wave signals.
Compared with the prior art, the method can realize the pseudo-phase conjugate echo of the incident light wave, and is used for greatly inhibiting the influence of atmospheric turbulence on the phase distortion of the light wave in the retro-reflection free space optical communication. Meanwhile, the access optical fiber modulator can solve the problem that the MRR modulation rate formed by a micro-cone reflector array and a spatial light modulator is low, and greatly improves the communication rate.
Drawings
FIG. 1 is a schematic diagram of a retro-reflective optical fiber according to an embodiment;
FIG. 2 is a schematic structural diagram of a type 1 retro-reflective optical fiber unit according to an embodiment;
FIG. 3 is a schematic structural diagram of a type 2 retro-reflective optical fiber unit according to an embodiment;
FIG. 4 is a schematic structural diagram of a type 3 retro-reflective optical fiber unit according to an embodiment;
FIG. 5 is a schematic structural diagram of a type 4 retro-reflective optical fiber unit according to an embodiment;
FIG. 6 is a schematic view of a type 1 fiber array type retro-reflector according to an embodiment;
FIG. 7 is a schematic view of a type 2 fiber array type retro-reflector according to an embodiment;
FIG. 8 is a schematic view of a type 3 fiber array type retro-reflector according to an embodiment;
FIG. 9 is a schematic view of a type 4 fiber array type retro-reflector according to an embodiment;
fig. 10 is a schematic structural diagram of a retro-reflective fiber-optic modulator according to a second embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to overcome the defects of the prior art and provides a fiber array type retro-reflector and a modulation method thereof.
Example one
The embodiment provides an optical fiber array type retro-reflector, comprising an optical fiber; aligning and arranging two ends of the optical fiber side by side to obtain a retro-reflection optical fiber; combining a plurality of retro-reflection optical fibers to obtain a retro-reflection optical fiber unit; and arranging the plurality of retro-reflection optical fiber units to obtain the optical fiber array type retro-reflector.
As shown in fig. 1, two ends of the optical fiber are aligned and arranged side by side to form a retro-reflective optical fiber, and each end face of the retro-reflective optical fiber has light waves incident and emergent.
In this embodiment, the retro-reflection fiber can be a single-mode fiber, the fiber core diameter is 6 microns, the cladding diameter is 125 microns, the coating layer of the fiber needs to be stripped, two end faces of the fiber need to be located in the same plane, the bending angle of the fiber is 180 degrees, so that the emergent light and the incident light are kept parallel, and the retro-reflection is realized.
Combining a plurality of retro-reflection optical fibers to obtain a retro-reflection optical fiber unit, as shown in fig. 2-5, the retro-reflection optical fiber unit can be formed by a small number of sets of retro-reflection optical fibers in different arrangement modes, and the effective area diameter of the retro-reflection optical fiber unit is smaller than a millimeter level, so that an incident light wave front is rotated by 180 degrees around the center of the retro-reflection optical fiber unit to be emitted in a unit range, and an approximate conjugate echo in a micro-cell area is formed.
Wherein, fig. 2 is a schematic diagram of a type 1 retro-reflection optical fiber unit, the type 1 retro-reflection optical fiber unit is arranged in a transverse direction and comprises two ends of a retro-reflection optical fiber 1; FIG. 3 is a schematic diagram of a type 2 retro-reflective fiber unit, which includes two ends of a retro-reflective fiber 2; the 2-type retro-reflection optical fiber units are vertically arranged, fig. 4 is a schematic diagram of the 3-type retro-reflection optical fiber unit, which comprises two ends 3-1 and two ends 3-2 of the schematic diagram of the 3-type retro-reflection optical fiber unit, and the 3-type retro-reflection optical fiber unit adopts two retro-reflection optical fibers which are vertically arranged at 90 degrees; fig. 5 is a schematic view of a 4-type retro-reflection optical fiber unit, which includes two ends 1-1, two ends 4-2, and two ends 4-3, and the 4-type retro-reflection optical fiber unit employs three retro-reflection optical fibers arranged at 60 degrees with respect to each other.
And arranging the plurality of retro-reflection optical fiber units to obtain the optical fiber array type retro-reflector. As shown in fig. 6-9, the optical fiber array type retro-reflector is composed of a large number of retro-reflective optical fiber units arranged, so as to realize the pseudo-phase conjugate echo of the incident light wave, and compensate the phase distortion of the light wave caused by the turbulent medium.
FIG. 6 is a schematic diagram of a type 1 fiber array type retro-reflector, which is composed of type 1 retro-reflective fiber units; FIG. 7 is a schematic diagram of a type 2 fiber array type retro-reflector, which is composed of type 2 retro-reflective fiber units; FIG. 8 is a 3-type optical fiber array type retro-reflector, which is composed of 3-type retro-reflective optical fiber units; fig. 9 is a type 4 optical fiber array type retro-reflector, which is formed by connecting type 4 retro-reflective optical fiber units through a regular hexagonal honeycomb.
Compared with the prior art, the embodiment can realize the pseudo-phase conjugate echo of the incident light wave, and is used for greatly inhibiting the influence of atmospheric turbulence on the phase distortion of the light wave in the retro-reflection free space optical communication. Meanwhile, the access optical fiber modulator can solve the problem that the MRR modulation rate formed by a micro-cone reflector array and a spatial light modulator is low, and greatly improves the communication rate.
Example two
The present embodiment provides a modulation method of a fiber array type retro-reflector, which is based on the fiber array type retro-reflector of the first embodiment.
As shown in fig. 10, an optical fiber modulator may be connected to the retro-reflective optical fiber to modulate the optical wave signal. The modulation method can modulate the intensity, frequency, phase, polarization and other states of the optical wave.
The optical fiber modulator is classified into an electro-optic modulator, an acousto-optic modulator, a magneto-optic modulator, an electro-absorption modulator, and the like. In this embodiment, the electro-optic intensity modulator and the electro-absorption intensity modulator, which are most widely used in modern optical fiber communication, are selected for explanation. Obviously, the present embodiment does not limit the form of the light wave modulation and the type of the optical fiber modulator.
The following describes in detail the implementation of the optical wave intensity modulation function when a mach-zehnder (M-Z) interferometric modulator and an electro-absorption modulator in an electro-optic modulator are employed, respectively.
When the optical fiber modulator adopts an M-Z interferometric modulator, for a single retro-reflective optical fiber (as shown in fig. 10), the optical wave enters the optical fiber from the a end of the optical fiber, and then enters the waveguide of the M-Z interferometric modulator, and at the first node, the optical wave is divided into two optical waves with the same intensity and the same phase, and the two optical waves continue to propagate in the waveguide. If no bias voltage is applied, at the second node, the two paths of light waves are converged into light waves which are the same as those entering the waveguide, and the light waves are emitted from the end b of the optical fiber, and the emitted light waves represent code elements '1'. If bias voltage is added on the electrode, the refractive index of the electro-optic material where the single arm of the branch waveguide is located can be changed through the difference of the bias voltage, so that the phase of the side waveguide is changed, when the proper bias voltage is selected, two paths of light waves at a second node have a phase difference of pi, the two paths of light waves are cancelled, no light wave exits from the end b of the optical fiber, no exiting light wave exists at the time, and the code element is '0'. Meanwhile, the light wave incident from the end b of the optical fiber is modulated in the same manner, and finally exits from the end a of the optical fiber. Thus, the light waves incident on both end faces are modulated in intensity.
When the optical fiber modulator adopts an electro-absorption modulator, for a single retro-reflection optical fiber (as shown in fig. 10), light waves enter the optical fiber from the end a of the optical fiber, when the modulation voltage makes P-I-N reverse bias, the incident light waves are completely absorbed by the layer I, the incident light waves cannot pass through the layer I, and at this time, no emergent light waves exist at the end b of the optical fiber, which represents a code element "0". When the bias voltage is zero, the barrier potential is small, the incident light wave passes through the I layer without being absorbed, and the light wave emitted from the end b of the optical fiber corresponds to the symbol "1". Meanwhile, the light wave incident from the end b of the optical fiber is modulated in the same manner, and finally exits from the end a of the optical fiber. Thus, the light waves incident on both end faces are modulated in intensity.
The optical fiber array type retro-reflector not only can realize the pseudo-phase conjugate echo of the incident light wave, but also can realize the modulation of the intensity of the incident light wave by accessing the optical fiber modulator, thereby completing the modulation retro-reflection of the incident light wave at a higher speed.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (5)

1. An optical fiber array type retro-reflector comprising an optical fiber; aligning and arranging two ends of the optical fiber side by side to obtain a retro-reflection optical fiber; combining a plurality of retro-reflection optical fibers to obtain a retro-reflection optical fiber unit; arranging a plurality of retro-reflection optical fiber units to obtain an optical fiber array type retro-reflector; and an optical fiber modulator is connected into the retro-reflection optical fiber, and the bias voltage is selected to modulate the intensity of the optical wave.
2. The optical fiber array type retro-reflector according to claim 1, wherein each end face of the retro-reflecting optical fiber has light waves incident and exiting.
3. The optical fiber array type retro-reflector according to claim 2, wherein the end faces of the retro-reflecting optical fibers are in the same plane, and the bending angle of the optical fibers is 180 degrees, so as to realize retro-reflection of incident light waves.
4. The optical fiber array type retro-reflector according to claim 1, wherein the plurality of retro-reflection optical fibers are combined in different arrangement modes to obtain a retro-reflection optical fiber unit with a diameter smaller than a millimeter level, so that a wavefront of an incident light wave rotates around the center of the retro-reflection optical fiber unit by 180 degrees to be emitted to form an approximate conjugate echo in a micro area.
5. The optical fiber array type retro-reflector according to claim 4, wherein the plurality of retro-reflecting optical fiber units are arranged to realize pseudo-phase conjugate echoes of incident light waves to compensate for phase distortion of the light waves caused by turbulent media.
CN202011580688.7A 2020-12-28 2020-12-28 Optical fiber array type retro-reflector Active CN112713940B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1828370A (en) * 2006-03-24 2006-09-06 南开大学 Optical fiber signal modulator based on echo interference effect
CN105577281A (en) * 2016-01-13 2016-05-11 深圳大学 FSO communication network system between mobile nodes
CN106452581A (en) * 2016-07-28 2017-02-22 杭州摩焕科技有限公司 Reverse modulation free space optical communication system based on pseudo phase conjugate reflector
CN106856414A (en) * 2016-12-15 2017-06-16 长春理工大学 Inversely modulate reply free space laser communication system in big visual field

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8301032B2 (en) * 2008-02-12 2012-10-30 Arun Kumar Majumdar Wide field-of-view amplified fiber-retro for secure high data rate communications and remote data transfer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1828370A (en) * 2006-03-24 2006-09-06 南开大学 Optical fiber signal modulator based on echo interference effect
CN105577281A (en) * 2016-01-13 2016-05-11 深圳大学 FSO communication network system between mobile nodes
CN106452581A (en) * 2016-07-28 2017-02-22 杭州摩焕科技有限公司 Reverse modulation free space optical communication system based on pseudo phase conjugate reflector
CN106856414A (en) * 2016-12-15 2017-06-16 长春理工大学 Inversely modulate reply free space laser communication system in big visual field

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