CN110854657B - Resonance optical communication device without intra-cavity interference based on optical frequency doubling - Google Patents
Resonance optical communication device without intra-cavity interference based on optical frequency doubling Download PDFInfo
- Publication number
- CN110854657B CN110854657B CN201910978155.5A CN201910978155A CN110854657B CN 110854657 B CN110854657 B CN 110854657B CN 201910978155 A CN201910978155 A CN 201910978155A CN 110854657 B CN110854657 B CN 110854657B
- Authority
- CN
- China
- Prior art keywords
- retro
- reflector
- resonant
- frequency
- lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/163—Solid materials characterised by a crystal matrix
- H01S3/164—Solid materials characterised by a crystal matrix garnet
- H01S3/1643—YAG
-
- 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
- H04B10/60—Receivers
Abstract
The invention relates to a resonant optical communication device based on optical frequency doubling and free of intracavity interference, which comprises a host machine and a slave machine, wherein the host machine comprises a retro-reflection modulation module and a resonant light emitting module consisting of a first retro-reflector and a gain medium, the slave machine comprises a second retro-reflector, a resonant light path between the first retro-reflector and the second retro-reflector forms a free space resonant cavity, and the retro-reflection modulation module comprises a third back reflector, an optical modulator, an optical frequency multiplier and a third lens, wherein the third back reflector, the optical modulator, the optical frequency multiplier and the third lens are arranged along the light path. Compared with the prior art, the invention has the advantages of high-speed resonant optical communication, mobility, interference avoidance and the like.
Description
Technical Field
The invention relates to the field of wireless optical communication, in particular to a resonance optical communication device without intra-cavity interference based on optical frequency doubling.
Background
With the development of information technology, the carrier frequency of wireless communication systems is higher and higher because higher carrier frequencies can provide larger bandwidths. The frequency of millimeter wave communication which is currently researched has reached dozens of GHz, while the carrier waves with higher frequencies are light waves in a frequency band of hundreds of THz. In the foreseeable future, the use of light waves for wireless communication will be an important technical means, and a data transmission channel is provided for application fields requiring large bandwidth communication, such as virtual reality and augmented reality.
However, a challenge facing wireless optical communications is the tradeoff of received power and mobility. Particularly, a common LED lamp can realize optical communication with a wide coverage area, and a mobile terminal can flexibly move within the light coverage area, however, the receiving power of the mobile terminal is very low, and the signal-to-noise ratio of the mobile terminal is often difficult to meet the requirement of high-rate communication. Another technique is to use a focused LED or laser to achieve directional optical communication, which typically requires the use of a mechanical or non-mechanical beam steering device to direct the beam to the receiver. Mechanical devices generally adopt a micro-electro-mechanical system to control the rotation of a reflector to realize beam steering, and the devices have slow response speed and low precision. The conventional non-mechanical beam steering device adopts a grating or a spatial light modulator, has high response speed, but has the difficulty that the receiver needs to be accurately positioned in advance, which has great technical and cost challenges.
In chinese invention patent 2017110620229.8, "wireless communication device based on distributed optical resonator" and chinese invention patent 201811209197.4, "energy-carrying communication device based on resonant beam", a scheme for realizing wireless communication by using free-space laser resonator is mentioned, and such scheme has higher received power and better mobility, and is a technology for breaking through the bottleneck of conventional wireless communication.
However, directly modulating the beam within the free-space laser cavity inevitably faces the problem of intra-cavity echo interference, i.e. the modulated beam travels back and forth within the cavity, affecting the subsequent communication process. The echo interference problem exists, so that the scheme can only realize modulation at a low rate, and the superiority of the free space laser resonant cavity in wireless optical communication is not fully reflected.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a resonant optical communication device without intra-cavity interference based on optical frequency doubling.
The purpose of the invention can be realized by the following technical scheme:
the host machine comprises a retro-reflection modulation module and a resonant light emitting module consisting of a first retro-reflector and a gain medium, the slave machine comprises a second retro-reflector, a resonant light path between the first retro-reflector and the second retro-reflector forms a free space resonant cavity, and the retro-reflection modulation module comprises a third back reflector, an optical modulator, an optical frequency multiplier and a third lens, wherein the third back reflector, the optical modulator, the optical frequency multiplier and the third lens are arranged along the light path.
The first retro-reflector is composed of a first back reflector and a first lens, the second retro-reflector is composed of a second lens and a second back reflector, and the second back reflector is plated with a film with wavelength selection property and used for transmitting frequency doubling beams and reflecting resonance beams.
When the device adopts the optical path folding type structure, the pupil of the first retro-reflector coincides with the pupil position of the retro-reflective modulation module, and the gain medium is disposed at the pupil position, and a reflection surface is disposed behind the gain medium.
The reflecting surface is a reflecting surface with partial transmissivity, the third lens, the optical frequency multiplier, the optical modulator and the third rear reflector are sequentially arranged in the transmission direction of the reflecting surface, and the first retro-reflector is arranged in the reflecting direction of the reflecting surface.
When the device adopts a light path through type structure, the optical frequency multiplier is arranged on a resonance light path between the second rear reflector and the first lens, the first rear reflector is plated with a film with wavelength selection property and is used for transmitting frequency-doubled light beams and reflecting resonance light beams, and the third lens, the optical modulator and the third rear reflector are sequentially arranged in the transmission direction of the first rear reflector.
The gain medium is disposed at the pupil of the first retro-reflector.
The third lens is composed of two lenses which are arranged in parallel.
The film with the wavelength selection property is specifically a frequency doubling light beam antireflection film and a resonance light beam antireflection film.
The slave machine also comprises a condensing lens and a photoelectric detector which are arranged behind the second rear reflector and used for receiving the frequency doubling light beam.
The frequency of the frequency doubling light beam is not less than 2 times of the frequency of the resonance light beam.
Compared with the prior art, the invention has the following advantages:
the invention creatively designs a composite lens group structure, which can lead out a part of resonance light beams with power to carry out frequency doubling and modulation, and the other part of resonance light beams maintain resonance in a cavity. A wavelength selective retro-reflector is used in the slave to separate the frequency doubled beam from the resonant beam. In the design, the frequency doubling light beam carrying modulation information directly utilizes the spontaneous established path of the resonance light beam and cannot form oscillation in the free space resonant cavity, so that the problem of echo interference in the cavity is avoided. Therefore, the invention realizes high-speed resonant optical communication, and the extracted frequency doubling modulated light beam can be reflected back according to the original path and reenters the resonant light beam path. Since the spontaneous establishment characteristic of the resonant beam is the root cause for imparting mobility to the communication link, the design of the patent to cause the frequency doubled modulated beam to revert back to the resonant beam path maintains the mobility of the communication device.
Drawings
Fig. 1A is a schematic diagram of the structure and principle of a telecentric cat-eye retroreflector.
FIG. 1B is a schematic diagram of a free-space laser resonator structure based on a telecentric cat-eye retroreflector.
Fig. 2 is a schematic structural diagram of the resonant optical communication device without intra-cavity interference based on optical frequency doubling according to the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of the optical path folding type in fig. 2.
Fig. 4 is a schematic structural view of the optical path through type embodiment shown in fig. 2.
The notation in the figure is:
1. a master, 11, a back mirror, 12, a lens, 13, a pupil, 14, a light beam, 150, a back mirror, 151, a lens, 152, a pupil, 160, a back mirror, 161, a lens, 162, a pupil, 17, a gain medium, 18, a resonant light beam, 2, a slave, 20, a resonant light emitting module, 201, a first retro-reflector, 202, a gain medium, 203, a reflective surface with partial transmissivity, 21, a retro-reflective modulation module, 22, a second retro-reflector, 23, a condenser lens, 24, a photodetector, 3, a free space, 210, a third back mirror, 211, a light modulator, 212, a light multiplier, 213, a third lens, 2130, a lens, 2131, a lens, 4, a reflective surface, 2011, a first back mirror, 2012, a first lens, 221, a second lens, 222, a second back mirror, 80, a pupil of a first retro-reflector, 81, a pupil of a second retro-reflector, 82. the pupil of the modulation module is retroreflected.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Fig. 1A and 1B together illustrate the principle of a free-space laser cavity based on a telecentric cat-eye retro-reflector. Fig. 1A shows a structure of a telecentric cat-eye retroreflector, which includes a lens (12) and a back mirror (11) at the focal plane of the lens (12). According to the principles of geometric optics, any light passing through the focal point of the lens passes through the lens and is then incident normally at the focal plane on this side of the lens. If the other light beams are parallel to the light rays passing through the focal point of the lens, the other light beams pass through the lens and are focused to the same point, and the focused point is the point of the light rays passing through the focal point of the lens and finally perpendicularly incident on the focal plane. The light reflected by the rear reflector at the focal plane is still parallel to the incident light after passing through the lens, i.e. the reflected light is reflected in the direction opposite to the incident light. According to the principle, a pupil (13) is considered to exist at the focal point of the lens (12), and any parallel light beam (14) entering through the pupil (13) is reflected by the cat-eye retro-reflector, then passes through the pupil (13) and is coincided with the path of the original incident light beam (14).
FIG. 1B is an example of a free-space laser cavity based on a telecentric cat-eye retro-reflector. In this example, a first retro-reflector is constituted by a back mirror (150) and a lens (151); a second retroreflector is constituted by a rear mirror (160) and a lens (161). According to the principle of a cat-eye retroreflector, parallel light beams on a line between the first retroreflector pupil (152) and the second retroreflector pupil (162) can oscillate back and forth regardless of the relative position between the first retroreflector and the second retroreflector. Thus, the first retro-reflector and the second retro-reflector form a free space resonant cavity. The gain medium (17) is located at the first retro-reflector pupil (152), and since the path of the oscillating light beam necessarily passes through the pupil (152), the gain medium can be made small in size and high in energy use efficiency. The free space laser resonant cavity is formed by the free space resonant cavity and the intracavity gain medium. According to the laser principle, a resonant beam of energy-concentrated reciprocating motion can be spontaneously generated within the cavity. Thus, modulation of information can be achieved by varying the intracavity resonant beam. The intracavity resonant beam is generated spontaneously, connecting the transmitting device and the receiving device, and the beam can still be generated during movement of the devices, which provides mobility to the communication system.
The patent discloses a resonance optical communication device based on optical frequency doubling and without echo interference, which comprises a host and a slave. A first retro-reflector is included in the master and a second retro-reflector is included in the slave. In the main unit, a gain medium is further included in the optical path between the first retro-reflector and the second retro-reflector. The two retro-reflectors and the communicable light path between them form a free space resonant cavity, and photons can reciprocate in the free space resonant cavity to generate oscillation. Therefore, when the gain medium absorbs external energy and population inversion occurs, photons generated by spontaneous radiation of the gain medium enter the free space resonant cavity and oscillate back and forth between the first retro-reflector and the second retro-reflector. The photons repeatedly pass through the gain medium in the oscillation process, the power of the photons is also continuously amplified, and finally a resonant beam with high power density is formed.
The retro-reflectors each have a pupil area through which all light beams capable of being retro-reflected must pass, and therefore the resonant light beams must pass through the pupils of the first and second retro-reflectors. The gain medium should be placed in the pupil area of the first retro-reflector so that the resonant beam generated on any path passes through the gain medium. This configuration can reduce the volume of the gain medium, thereby saving cost and reducing energy consumption.
Directly modulating resonant light within the cavity faces a number of problems. On the one hand, the power of the modulated resonant light beam is fluctuated, and the balance between the intracavity resonant light power and the dynamic gain of the gain medium is broken, so that the resonant light beam power is more unstable. On the other hand, due to the nature of the resonant beam, if the communication modulation is performed in the free space resonant cavity, the modulated beam will move back and forth, becoming echo interference affecting subsequent communication.
In view of the above problems, the present patent proposes to use optical frequency doubling and filtering to realize resonance optical communication without echo interference. In contrast to the resonance beam, the frequency doubled beam is generated by passing the resonance beam or a part of the beam extracted from the resonance beam through an optical frequency doubler, the frequency of which is twice or higher than the original resonance beam. The patent thus also includes at least one optical frequency doubler, which may be located in the path of the resonant beam or in the path of the beam emerging from the resonant beam.
The path of the resonant light beam in the main machine at least comprises a reflecting surface with partial transmissivity, and the reflecting surface is used for leading out frequency doubling light beams fused in the resonant light beam or directly leading out a part of the resonant light beam. Depending on the position of the optical doubler, there are two alternatives:
a) when the frequency doubling crystal is placed on the resonance light path, the frequency doubling light beam is generated on the resonance light beam path and is mixed with the resonance light beam, so that the reflecting surface with partial transmissivity is coated with a film with wavelength selection property to separate the frequency doubling light beam from the resonance light beam, wherein the separated frequency doubling light beam is transmitted to the retro-reflection modulation module;
b) when the frequency doubling crystal is placed on the path of the light beam extracted from the resonant light beam, the reflecting surface with partial transmissivity should separate a part of the light beam from the resonant light beam according to a certain power proportion, so that the light beam becomes a frequency doubling light beam after passing through the frequency doubling crystal and is transmitted to the retro-reflection modulation module.
In different embodiments, the reflecting surface with partial transmission may be a separate mirror or may be a back mirror in the first retro-reflector structure.
Therefore, the host comprises a retro-reflection modulation module which is used for modulating the frequency doubling light beam and reflecting the modulated frequency doubling light beam according to the original incident direction. Because the frequency doubling light beam is generated by the resonance light beam through the frequency doubler, and the frequency doubler does not influence the propagation direction of the light beam, the frequency doubling light beam reflected by the retro-reflection modulation module can be returned to the path of the resonance light beam and propagated to the slave.
In the host, the retro-reflective modulation module includes at least one retro-reflector and a light modulator. The pupil of the first retro-reflector used to form the resonant beam or its equivalent pupil should overlap with the pupil of the retro-reflector within the retro-reflective modulation module. The direction of the intracavity resonant beam is dynamically varied depending on the relative positions of the master and slave. However, the pupil of the retro-reflector is stationary, depending only on the configuration of the retro-reflector. Therefore, in the structure disclosed in this patent, the pupil of the first retro-reflector or its equivalent and the pupil of the retro-reflector in the retro-reflective modulation module should be overlapped, in which case the requirement that the resonance light beam passes through the pupil of the first retro-reflector in the host and the pupil of the retro-reflector in the retro-reflective modulation module at the same time can be satisfied. The equivalent pupil is another fixed area other than the pupil through which a part of the light beam split by the retroreflector must pass by the transforming action of the optics. When the pupil of the retro-reflective modulation module overlaps the equivalent pupil of the first retro-reflector, the split beam from the resonant beam can also be reflected back to the resonant beam path.
In the slave, a partially transmissive reflecting surface having wavelength selective properties is included, the reflecting surface functioning to separate the resonant beam from the frequency doubled beam. According to different embodiments, the partially transmissive reflective surface having wavelength selective properties may be arranged to reflect the resonance light beam and transmit the frequency doubled light beam, or to reflect the frequency doubled light beam and transmit the resonance light beam. According to different embodiments, the partially transmissive reflective surface with wavelength selective properties may be a separate device or may be a reflective surface inside the second retro-reflector structure.
In the slave, a condenser and at least one photodetector are also included. The condenser is used for collecting frequency doubling light beams led out by the partially-transmitted reflecting surface with the wavelength selection property and concentrating the frequency doubling light beams on the photoelectric detector. The photodetector receives the frequency-doubled optical signal that has been modulated and converts it into a corresponding electrical signal.
Example 1:
as shown in fig. 2, the main unit 1 of the resonant optical communication device based on optical frequency doubling without intra-cavity interference includes a resonant light generation module 20 and a retro-reflection modulation module 21. The resonant light generation module 20 includes a first retro-reflector 201, a gain medium 202, and a reflection surface 203 having a partial transmittance, and includes a second retro-reflector 22, a condenser 23, and a photodetector 24 from the slave 2.
The optical path between the first retro-reflector 201 and the second retro-reflector 22 in fig. 2 constitutes a free space resonant cavity. The gain medium 202 is placed at the pupil position of the first retro-reflector 201, and has the functions of frequency selection and power amplification. Specific materials of the gain medium optionally include neodymium-doped yttrium aluminum garnet Nd: YAG crystals, neodymium-doped yttrium vanadate Nd: YVO4 crystals, gallium arsenide GaAs semiconductor materials, and the like. For example, the embodiment of fig. 2 uses Nd: YAG crystal as the gain medium, and 1064nm semiconductor laser as the pumping source, so that the wavelength of the resonant beam formed in the free space 3 is 1064 nm.
The reflecting surface 203 having partial transmittance is disposed behind the gain medium, i.e., also in the pupil region of the first retro-reflector 201, which can increase the energy conversion efficiency of the gain medium. The reflecting surface 203 having partial transmittance reflects a part of the resonant beam of power to the first retro-reflector 201 and transmits another part of the resonant beam of power to the retro-reflective modulation module 21.
The retro-reflective modulation module 21 includes a light multiplier and a light modulator inside, so that the 1064nm light beam transmitted by the reflective surface 203 passes through the light multiplier to generate a 532nm frequency-doubled light beam. Further, the 532nm frequency doubled light beam is modulated by the optical modulator. The modulator comprises an optical intensity modulator and a phase modulator made of lithium niobate crystals, or an electro-absorption modulator made of semiconductor materials. Illustratively, the scheme selects a lithium niobate light intensity modulator, and changes the amplitude or the light intensity of a 532nm light beam so that the light beam carries information. Finally, the retro-reflective modulator 21 reflects the modulated 532nm frequency doubled beam back in the path of the original 1064nm beam. According to the setup, the 532nm doubled frequency beam reflected by the retro-reflective modulator 21 and the 1064nm beam reflected by the first retro-reflector 201 are merged at the pupil position where the gain medium 202 is located and propagate through the free space 3 to the slave 2 according to the same optical path.
In fig. 2, the second retro-reflector 22 in the slave 2 has wavelength selective properties, i.e. light at 1064nm is reflected back in retro-reflection, while light at 532nm is directed out of the resonant beam path. Specifically, a 1064nm antireflection film and a 532nm antireflection film are plated on the inner reflecting surface of the second retroreflector 22. 532nm light is transmitted out and then collected by the condenser 23 onto the photodetector 24. Finally, the photodetector 24 converts the optical signal into an electrical signal and outputs it.
Example 2
Fig. 3 shows a folding type structure of the present invention. The host 1 in this embodiment includes the following parts:
a retro-reflective modulation module composed of a rear mirror 310, a light modulator 211, and a third lens 213;
b a first retro-reflector composed of a first back mirror 2011 and a first lens 2012;
c gain medium 202 at the first retro-reflector pupil 80;
d a light doubler 212 inside the retro-reflective modulation module, i.e. between the light modulator 211 and the third lens 213;
e a reflecting surface 4 having a partial transmittance.
The slave 2 of the embodiment shown in fig. 3 comprises the following parts:
a second retro-reflector composed of a second coated rear mirror 222 and a second lens 221;
b a condenser constituted by a focusing lens 23;
In fig. 3, the first retro-reflector and the second retro-reflector constitute a free space resonant cavity, according to the reflection action of the reflection surface 4 having partial transmittance, that is, a resonance light beam can be generated between the first retro-reflector and the second retro-reflector, and these light beams pass through the pupil 80 of the first retro-reflector and the pupil 81 of the second retro-reflector. The embodiment shown in fig. 3 illustratively employs a Nd: YAG crystal as the gain medium, and thus produces a resonant beam wavelength of about 1064 nm. A small portion of the resonant beam may pass through a reflective surface 4 having a transmissivity and pass to the retro-reflective modulation module. Since the pupil 80 of the first retro-reflector is also the pupil of the retro-reflective modulation module, the light beam passing through the reflecting surface 34 can be reflected back. In particular, the light beam passing through the reflective surface 4 will also pass through the optical doubler 212 to be doubled at a wavelength of about 532nm before being reflected back to the pupil 80 of the first retro-reflector. The frequency doubled light then passes through an optical modulator 211 as a modulated frequency doubled light beam. The modulated frequency doubled beam finally returns to the pupil 80 of the first retro-reflector, coincides with the resonant beam and propagates through the free space 3 to the slaves, by reflection from the third back mirror 210 and action of the third lens 213.
In fig. 3, since the coated second rear mirror 222 is coated with a reflective film for a light wave with a resonant beam wavelength of 1064nm and an anti-reflection film for a light wave with a frequency doubling light wavelength of 532nm, the resonant beam is reflected by the second rear mirror 222 back to the host 1, and the modulated frequency doubling light beam can pass through the second rear mirror 222 and be concentrated on the photodetector 24 by the focusing lens 23.
Example 3
Fig. 4 is a through-type structure designed based on another more specific exemplary embodiment of fig. 2. The host 1 comprises the following parts:
a first retro-reflector composed of a first back mirror 2011 having partial transmittance and a first lens 2012;
b is a retro-reflective modulation module consisting of a third back reflector 210, a light modulator 211 and a third lens 213 which comprises two lenses arranged in parallel;
c gain medium 202 at the first retro-reflector pupil;
d is the optical doubler 43 inside the first retro-reflector, i.e. between the first back mirror 2011 having partial transmissivity and the lens 442.
The slave 2 of the embodiment shown in fig. 4 comprises the following parts:
a second retro-reflector composed of a lens and a second back mirror 222 and a second lens 221 having partial transmittance;
b a condenser consisting of a focusing lens 23;
In fig. 4, the first retro-reflector and the second retro-reflector constitute a free-space stimulated radiation resonant cavity. An energy-concentrated resonant beam is formed between the first retro-reflector and the second retro-reflector due to the frequency-selective and amplifying effects of the gain medium 202. Depending on the nature of the retro-reflection, the resonant beam must pass through the pupil 80 of the first retro-reflector and the pupil 81 of the second retro-reflector. The embodiment adopts Nd, YAG as a gain medium material, and the generated resonant beam frequency is 1064 nm.
In fig. 4, since the optical frequency doubler 212 is disposed on the resonant beam path, a small part of the resonant beam moving in the direction of the first back mirror 2011 becomes a 531nm frequency-doubled beam. The first rear mirror 2011 is plated with a 532nm antireflection film and a 1064nm antireflection film, so that the first rear mirror 2011 reflects all the resonant light beams back, and 532nm frequency doubling light beams can pass through the first rear mirror 2011.
In fig. 4, the first rear mirror 2011 also coincides with the focal plane of the first lens 2012, and thus the first rear mirror 2011 can be equivalent to the first lens 2012. Since the light beam reflected by the first rear mirror 2011 and the transmitted light beam can be regarded as mirror images, the plane in which the first lens 2012 and the first rear mirror 2011 are located can also be regarded as a mirror image of the first retro-reflector. Therefore, the frequency-doubled light beam transmitted into the retro-reflective modulation module by the first back mirror 2011 necessarily passes through the focal position of the first lens 2012.
In fig. 4, the first rear mirror 2011 and lens 2131 also form a telecentric cat-eye retro-reflector that reflects the doubled frequency beam, and thus has the pupil 82 of the retro-reflective modulation module. In this embodiment, the pupil 82 of the retro-reflective modulation module is also at the focal position of the first lens 2012. Therefore, the frequency-doubled light beam entering the retro-reflector modulation module through the first back mirror 2011 also inevitably passes through the pupil 82 of the retro-reflection modulation module, and the requirement of the telecentric cat-eye retro-reflector on the path of the incident light beam is met. The frequency doubled light beam is modulated by the light modulator 211 inside the telecentric cat-eye retro-reflector that reflects the frequency doubled light to become a modulated frequency doubled light beam. Finally, due to the action of the retro-reflector, the modulated frequency-doubled light beam will also pass through the pupil 82 of the retro-reflective modulation module, be reflected back to the first back mirror 2011 in the original path, and after passing through the first back mirror 2011, be overlapped with the resonant light beam, and finally propagate to the slave 2 through the free space 3.
In fig. 4, the second rear mirror 222 in slave machine 2 is coated with an antireflection film for 1064nm light and an antireflection film for 532nm light. The resonant beam is reflected by the second back mirror 222 back to the main unit 1, and the modulated frequency-doubled beam is transmitted through the second back mirror 222 and focused by the focusing lens 23 onto the photodetector 24.
When the light modulator 211 is a multiple quantum well semiconductor electro-optic modulator, it may also be placed at the pupil 82 of the retro-reflective modulation module. Since all the frequency-doubled light necessarily passes through the pupil 82 position, the area of the multiple quantum well electro-optical modulator can be set small, which contributes to an increase in the modulation rate.
Those skilled in the art will recognize that the present invention is not limited to those specifically illustrated or described above, but encompasses combinations and sub-combinations of individual features and variations and modifications thereof which occur to persons skilled in the art upon reading the foregoing description and which are not in the prior art and which are not described in the context.
Claims (8)
1. A resonance optical communication device based on light frequency doubling without intracavity interference comprises a host (1) and a slave (2), wherein the host (1) comprises a retro-reflection modulation module (21) and a resonance light emitting module (20) composed of a first retro-reflector (201) and a gain medium (202), the slave (2) comprises a second retro-reflector (22), a resonance light path between the first retro-reflector (201) and the second retro-reflector (22) forms a free space resonant cavity, the device is characterized in that the retro-reflection modulation module (21) comprises a third retro-reflector (210) arranged along the light path, an optical modulator (211), an optical frequency multiplier (212) used for generating frequency-doubled light beams and a third lens (213), the first retro-reflector (201) is composed of a first retro-reflector (221) and a first lens (20112012), the second retro-reflector (22) is composed of a second lens (221) and a second retro-reflector (222), the second rear mirror (222) is coated with a film having wavelength selective properties for transmitting the frequency-doubled light beam and reflecting the resonance light beam, and when the device adopts the optical path folding type structure, the pupil of the first retro-reflector (201) coincides with the pupil position of the retro-reflective modulation module (21), and the gain medium (202) is disposed at the pupil position, and a reflecting surface (4) is disposed behind the gain medium (202).
2. The resonant optical communication device according to claim 1, wherein the reflective surface (4) is a reflective surface with partial transmittance, the third lens (213), the optical frequency multiplier (212), the optical modulator (211) and the third back mirror (210) are sequentially disposed in the transmission direction of the reflective surface (4), and the first retro-reflector (201) is disposed in the reflection direction of the reflective surface (4).
3. The resonant optical communication device according to claim 1, wherein when the device is configured to have a pass-through structure, the optical frequency multiplier (212) is disposed on the resonant optical path between the second rear mirror (2011) and the first lens (2012), the first rear mirror (2011) is coated with a film with wavelength selective property for transmitting the frequency-multiplied light beam and reflecting the resonant light beam, and the third lens (213), the optical modulator (211) and the third rear mirror (210) are sequentially disposed in the transmission direction of the first rear mirror (2011).
4. A resonant optical communication device without intracavity interference based on frequency doubling of light according to claim 3, wherein the gain medium (202) is arranged at the pupil of the first retro-reflector (201).
5. A resonant optical communication device based on optical frequency doubling without intracavity interference according to claim 3, wherein the third lens (213) is composed of two lenses arranged in parallel.
6. The device according to claim 3, wherein the wavelength selective films are frequency doubling light beam antireflection films and resonance light beam antireflection films.
7. The resonant optical communication device based on optical frequency doubling without intracavity interference according to claim 1, wherein the slave (2) further comprises a condenser lens (23) and a photodetector (24) which are arranged behind the second rear mirror (222) and receive the frequency-doubled light beam.
8. The apparatus according to claim 1, wherein the frequency of the frequency-doubled light beam is not less than 2 times the frequency of the resonant light beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910978155.5A CN110854657B (en) | 2019-10-15 | 2019-10-15 | Resonance optical communication device without intra-cavity interference based on optical frequency doubling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910978155.5A CN110854657B (en) | 2019-10-15 | 2019-10-15 | Resonance optical communication device without intra-cavity interference based on optical frequency doubling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110854657A CN110854657A (en) | 2020-02-28 |
| CN110854657B true CN110854657B (en) | 2020-10-02 |
Family
ID=69597604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910978155.5A Active CN110854657B (en) | 2019-10-15 | 2019-10-15 | Resonance optical communication device without intra-cavity interference based on optical frequency doubling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110854657B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809631B (en) * | 2020-06-16 | 2023-05-09 | 华为技术有限公司 | Communication device, center device, and communication system |
| CN113446963B (en) * | 2021-06-08 | 2022-06-21 | 同济大学 | Angle measuring system based on phased array and measuring method thereof |
| CN113676248B (en) * | 2021-07-22 | 2022-02-08 | 香港中文大学（深圳） | Resonance optical communication device based on echo interference elimination |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450550A (en) * | 2018-11-13 | 2019-03-08 | 同济大学 | A kind of relevant OAM communication demodulating system based on convolutional neural networks |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4530487B2 (en) * | 2000-02-10 | 2010-08-25 | 俊弘 津村 | Multi-channel optical communication system and optical transmission apparatus therefor |
| TWI396033B (en) * | 2008-11-07 | 2013-05-11 | Univ Nat Chiao Tung | Multi - frequency electrical signal of the photoelectric device |
| CN201774136U (en) * | 2010-05-06 | 2011-03-23 | 山东远普光学股份有限公司 | Mode-hop-free continuously-tuned semiconductor laser |
| EP2719097B3 (en) * | 2011-06-13 | 2023-06-07 | Wi-Charge Ltd. | Spatially distributed laser resonator |
| EP2790011B1 (en) * | 2011-12-05 | 2017-07-12 | Sony Corporation | Systems and methods for stimulated Raman scattering spectroscopy |
| CN105356215A (en) * | 2015-10-30 | 2016-02-24 | 中国工程物理研究院应用电子学研究所 | Direct frequency multiplication device of semiconductor laser |
| CN107911165B (en) * | 2017-11-02 | 2020-06-26 | 同济大学 | Wireless communication device based on distributed optical resonant cavity |
| CN109639353A (en) * | 2018-10-17 | 2019-04-16 | 同济大学 | It is a kind of that energy communication device is taken based on resonance light beam |
| CN109951233A (en) * | 2019-01-17 | 2019-06-28 | 同济大学 | A kind of multi beam resonance light portable communications system |
| CN110061412B (en) * | 2019-04-11 | 2021-02-26 | 中国科学院理化技术研究所 | Ultraviolet solid laser device suitable for optical communication |
| CN110045385B (en) * | 2019-04-12 | 2023-05-02 | 同济大学 | Laser ranging system based on separation resonant cavity |
| CN110058256B (en) * | 2019-04-12 | 2022-12-16 | 同济大学 | Tracking and positioning system based on separation cavity |
-
2019
- 2019-10-15 CN CN201910978155.5A patent/CN110854657B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450550A (en) * | 2018-11-13 | 2019-03-08 | 同济大学 | A kind of relevant OAM communication demodulating system based on convolutional neural networks |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110854657A (en) | 2020-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110854657B (en) | Resonance optical communication device without intra-cavity interference based on optical frequency doubling | |
| CN113162692A (en) | Resonance optical communication device | |
| EP1742098A1 (en) | Optical resonator, optical modulator, optical frequency comb generator, optical oscillator, and optical resonator manufacturing method | |
| CN110855356B (en) | Resonance wave beam communication device based on detection feedback control | |
| Xiong et al. | Resonant beam communications: Principles and designs | |
| JPH10303819A (en) | Laser transmission system and its operation method | |
| CN107947860B (en) | Energy and information composite transmission system for realizing full duplex communication based on optical fiber vibration | |
| Xiong et al. | Retro-reflective beam communications with spatially separated laser resonator | |
| CN110518976A (en) | A kind of communication device based on distributed optical resonance system | |
| CN113630182B (en) | Microwave photon regulation and control system and method based on-chip analog-digital signal | |
| Xiong et al. | Mobile optical communications using second harmonic of intra-cavity laser | |
| CN110838874B (en) | Mobile optical communication device supporting high-speed multi-beam tracking | |
| CN108963751A (en) | Injection Locking Semiconductor Lasers | |
| CN113541815B (en) | Resonant optical communication device and method based on gain control | |
| Javed et al. | Long-range wireless optical power transfer system using an EDFA | |
| CN113676248B (en) | Resonance optical communication device based on echo interference elimination | |
| EP3179645B1 (en) | Optical signal modulation apparatus and system | |
| CN110994814A (en) | Long-distance resonant light wireless energy supply device based on telescope optical modulator | |
| CN207765785U (en) | Narrow linewidth, tunable, continuous and mode-locked laser surface-emitting laser | |
| CN213957807U (en) | Double-entanglement photon pair generation device based on collinear BBO crystal | |
| CN107947852A (en) | The energy of full-duplex communication and information combined Transmission system are realized based on galvanometer | |
| CN109167236B (en) | Three-dimensional terahertz wave parametric oscillator | |
| CN214337915U (en) | Resonance optical communication device | |
| CN109193316B (en) | Multi-polarization period terahertz wave parametric oscillator | |
| WO2021254285A1 (en) | Communication apparatus, central device, and communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |