CN107819523B - High-speed reverse modulation reflection module based on modulator and reflection transmission method - Google Patents
High-speed reverse modulation reflection module based on modulator and reflection transmission method Download PDFInfo
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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
- H04B10/516—Details of coding or modulation
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
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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
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Abstract
本发明公开了一种基于调制器的高速逆向调制反射模块及反射传输方法。包括光学天线、空间‑光纤耦合装置、光环形器、偏振控制器、信号源、电光调制器，光学天线从自由空间接收的光载波经空间‑光纤耦合装置耦合入射到电光调制器中，通过电光调制器将信号源发出的电信号调制到来自空间‑光纤耦合装置的光载波上产生光信号，通过光环形器将光信号反射回空间‑光纤耦合装置，再经空间‑光纤耦合装置耦合回自由空间，经光学天线逆向回射，由此实现高速长距离自由空间通信。本发明用于高速逆向调制反射式自由空间激光通信系统，降低逆向调制终端设备的体积和功耗，同时大大提高上行信号的传输速率，满足下一代高速大容量长距离的自由空间光信号传输的需要。
The invention discloses a modulator-based high-speed reverse modulation reflection module and a reflection transmission method. It includes an optical antenna, a space-fiber coupling device, an optical circulator, a polarization controller, a signal source, and an electro-optical modulator. The optical carrier received by the optical antenna from the free space is coupled to the electro-optical modulator through the space-fiber coupling device, and the electro-optical The modulator modulates the electrical signal from the signal source to the optical carrier from the space-fiber coupling device to generate an optical signal, and reflects the optical signal back to the space-fiber coupling device through the optical circulator, and then couples back to the free space through the space-fiber coupling device. The space is retroreflected through the optical antenna, thereby realizing high-speed long-distance free-space communication. The present invention is used in a high-speed reverse modulation reflection free space laser communication system, reduces the volume and power consumption of the reverse modulation terminal equipment, and greatly improves the transmission rate of the uplink signal, so as to meet the requirements of the next generation of high-speed, large-capacity and long-distance free-space optical signal transmission. need.
Description
Technical Field
The invention relates to a signal high-speed reverse modulation reflection function module and a reflection transmission method, in particular to a high-speed reverse modulation reflection module based on a modulator and a reflection transmission method.
Background
With the increasing popularization of communication devices such as mobile phones and computers and the rapid development of spatial information technology, the demand of people for high-speed wireless information security transmission is rapidly increased. The free space optical communication technology has many potential advantages, such as high security, strong anti-interference capability, high bandwidth, high spectrum utilization rate, etc., and has been widely applied to information transmission systems between mobile devices and base stations (airplanes, satellites, ground platforms, etc.). However, the conventional high-precision active free-space optical system generally has the disadvantages of large volume, heavy weight, complex device, high power consumption, and the like, and is a great challenge for terminal devices with strict load requirements and energy consumption limitations. The retro-modulation reflection module is used as a competitive terminal device, combines an optical retro-reflector and a modulator, directly reflects a modulated optical signal to a signal transmitting end, transfers most weight and power consumption to a base station of a free space optical communication system, and can effectively solve application limitation of free space optical communication, so that the realization of the free space optical communication by the retro-modulation reflection module and the reduction of the volume and the technical complexity of the terminal device become an important trend.
The existing inverse modulation schemes comprise a frustrated total internal reflector, a liquid crystal modulator, a multi-quantum well device, a reflective semiconductor optical amplifier and the like, and the modulation rate of the schemes is relatively low, only reaches 1.25 gigabits/second at most, and still does not meet the requirement of high rate (dozens or even hundreds of gigabits/second) of modern optical communication.
Disclosure of Invention
The invention aims to provide a high-speed reverse modulation reflection module based on a modulator and a reflection transmission method, which can realize reverse modulation reflection of incident light.
The invention can realize the function of high-speed reverse modulation reflection by utilizing the high-speed modulation of the electro-optical modulator and matching with the optical antenna, the space-optical fiber coupling device and the optical circulator, and has important practical significance for realizing high-speed long-distance free space communication.
The technical scheme adopted by the invention is as follows:
a high-speed reverse modulation reflection module based on a modulator comprises:
the device comprises an optical antenna, a space-optical fiber coupling device, an optical circulator, a polarization controller, a signal source and an electro-optical modulator; the optical antenna is connected with the space-optical fiber coupling device through space optical coupling, the space-optical fiber coupling device is connected with the second port end of the optical circulator through optical fibers, the third port of the optical circulator is connected with the polarization controller through optical fibers, the polarization controller is connected with the input end of the electro-optical modulator through optical fibers, the output end of the electro-optical modulator is connected with the first port of the optical circulator through optical fibers, and the electro-optical modulator is connected with the signal source through cables.
The optical antenna receives optical carriers from the free space, the optical carriers are coupled and incident into the optical circulator through the space-optical fiber coupling device, the optical carriers are transmitted into the electro-optical modulator through the polarization controller, electric signals sent by the signal source are modulated onto the optical carriers from the space-optical fiber coupling device through the electro-optical modulator to generate optical signals, the optical signals are reflected back to the space-optical fiber coupling device through the optical circulator, then are coupled back to the free space through the space-optical fiber coupling device, and are reversely reflected back through the optical antenna, so that high-speed long-distance free space communication is realized.
The invention utilizes the high-speed modulation of the electro-optical modulator, and is matched with the optical antenna, the space-optical fiber coupling device and the optical circulator to realize the function of the high-speed reverse modulation reflection module. Compared with the optical signal transmission of the existing prism, the optical circulator and the electro-optical modulator are matched to carry out the processing, so that the volume is greatly reduced, and the power consumption is reduced.
Secondly, a high-speed reverse modulation reflection transmission method based on a modulator comprises the following steps:
the optical carrier received from the free space is incident into the electro-optical modulator through the optical circulator and the polarization controller, and simultaneously, the digital signal is loaded into the electro-optical modulator, the digital modulation electric signal is modulated onto the optical carrier through the electro-optical modulator to generate an optical signal, and the optical signal is reversely reflected back to the original incident port of the optical carrier through the optical circulator, so that the high-speed long-distance free space communication is realized.
The modulation format and the modulation rate of the retromodulation reflection module are determined by the modulation type and the highest modulation rate of the electro-optical modulator, wherein the modulation format is an on-off keying signal or a differential phase shift keying signal or a quaternary phase shift keying signal, and the modulation rate can reach at least 10 Gbit/s, so that compared with the existing retromodulation reflection module and mode (the transmission rate of the existing structure is at most 1.25 Gbit/s), the transmission rate is greatly improved.
The invention has the beneficial effects that:
according to the invention, high-speed modulation and reflection functions can be realized simultaneously only by one optical circulator and one electro-optical modulator, so that the transmission rate is greatly improved, the transmission rate of a modulation signal can reach at least 10 Gbit/s, the size and the weight of terminal equipment are reduced, and the method has important practical significance for realizing smaller, faster and longer-distance free space communication.
The invention can be used for a high-speed reverse modulation reflection type free space laser communication system, reduces the volume and the power consumption of reverse modulation terminal equipment, greatly improves the transmission rate of uplink signals, and can meet the requirement of free space optical signal transmission of next generation of high speed, large capacity and long distance.
Drawings
FIG. 1 is a schematic view of the connection structure of the device of the present invention.
Fig. 2 is an eye diagram of a retro-modulated reflected signal in an embodiment of the invention.
In the figure: 1 is an optical antenna, 2 is a space-optical fiber coupling device, 3 is an optical circulator, 4 is a polarization controller, 5 is a signal source, and 6 is an electro-optical modulator.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the high-speed retro-modulation reflection module of the present invention includes an optical antenna 1, a space-fiber coupling device 2, an optical circulator 3, a polarization controller 4, a signal source 5, and an electro-optical modulator 6. An optical carrier received by the optical antenna 1 from a free space is coupled and incident into the optical circulator 3 through the space-optical fiber coupling device 2, is transmitted into the electro-optical modulator 6 through the polarization controller 4, modulates an electric signal emitted by the signal source 5 onto the optical carrier from the space-optical fiber coupling device 2 through the electro-optical modulator 6 to generate an optical signal, then is reflected back to the space-optical fiber coupling device 2 through the optical circulator, is coupled back to the free space through the space-optical fiber coupling device 2, and is reversely retroreflected through the optical antenna 1.
In the invention, the optical antenna can select various existing space light collimation devices and systems, such as a lens, an optical telescopic system and the like, and the space-optical fiber coupling device, the optical circulator, the polarization controller and the electro-optical modulator can select various commercial devices.
The signal light of the device is received by an optical antenna 1, the signal is coupled to an optical circulator 3 through a space-optical fiber coupling device 2, then is transmitted to an electro-optical modulator 6 through a polarization controller 4, the electric signal sent by a signal source 5 is modulated onto an optical carrier to generate an optical signal by utilizing the high-speed modulation of the electro-optical modulator, then the optical signal is reflected by the optical circulator, the reflected signal light is coupled to a free space through the space-optical fiber coupling device 2 again, and then is reversely reflected by the optical antenna 1.
The examples of the invention are as follows:
according to the high-speed reverse modulation reflection module based on the electro-optical modulator, a space laser signal with the wavelength of 1550 nanometers is utilized, the space laser signal is coupled into the optical circulator through the optical antenna and the space-optical fiber coupling device, the optical circulator is connected with a polarization controller and is input to the electro-optical modulator through the polarization controller, a signal source generates a pseudo-random binary sequence of 10 Gbit/s for simulating a modulation signal in practical application, and loaded on an electro-optical modulator to be modulated into an on-off keying signal (OOK), and after passing through an optical circulator, the modulated on-off keying signal (OOK) enters the space-fiber coupling device, is coupled to free space, and then reversely retroreflects by the optical antenna, an eye diagram of a signal transmitted through free space measured in an experiment is shown in fig. 2, which is received at the space laser signal transmitting end and detected by a photoelectric detector.
The modulation rate of the mach-zehnder intensity modulator of the embodiment of the present invention supports 10 gbits/sec, so the maximum transmission rate of the downstream and the upstream that can be achieved by the embodiment is also 10 gbits/sec. But in particular practical applications higher rate electro-optical modulators may be used, such as in-phase quadrature modulators (IQM), with maximum modulation rates of up to at least 100 gbits/sec, and therefore the maximum transmission rate for application of the inventive structure is not limited thereto.
Therefore, the invention has obvious technical effect, can realize the function of reverse modulation reflection, has the characteristic of high speed, reduces the volume and the power consumption of reverse modulation terminal equipment, and simultaneously improves the transmission rate of uplink signals.
Claims (3)
1. A high-speed retro-reflective modulator, comprising: the device comprises an optical antenna (1), a space-optical fiber coupling device (2), an optical circulator (3), a polarization controller (4), a signal source (5) and an electro-optical modulator (6); the optical antenna (1) is connected with the space-optical fiber coupling device (2) through space optical coupling, the space-optical fiber coupling device (2) is connected with the second port end of the optical circulator (3) through optical fibers, the third port of the optical circulator (3) is connected with the polarization controller (4) through optical fibers, the polarization controller (4) is connected with the input end of the electro-optical modulator (6) through optical fibers, the output end of the electro-optical modulator (6) is connected with the first port of the optical circulator (3) through optical fibers, and the electro-optical modulator (6) is connected with the signal source (5) through cables;
the optical antenna (1) receives optical carriers from free space, the optical carriers are coupled and incident into the optical circulator (3) through the space-optical fiber coupling device (2), the optical carriers are transmitted into the electro-optical modulator (6) after passing through the polarization controller (4), electric signals sent by the signal source (5) are modulated onto the optical carriers through the electro-optical modulator (6) to generate optical signals, the optical signals are reflected back to the space-optical fiber coupling device (2) through the optical circulator (3), then are coupled back to the free space through the space-optical fiber coupling device (2), and are reversely reflected back through the optical antenna (1), so that high-speed long-distance free space communication is achieved.
2. A high-speed retro-modulated transmission method based on a modulator applied to the high-speed retro-modulated reflection module of claim 1, characterized in that: the method comprises the steps that a light carrier received from a free space is incident into an electro-optical modulator through an optical circulator and a polarization controller, specifically, the light carrier is incident into the optical circulator through coupling of a space-optical fiber coupling device, then the light carrier is transmitted into the electro-optical modulator through the polarization controller, meanwhile, a digital electric signal is loaded into the electro-optical modulator, the digital electric signal is modulated onto the light carrier through the electro-optical modulator to generate an optical signal, and the optical signal is reversely reflected back to an original incident port of the light carrier through the optical circulator, so that high-speed long-distance free space communication is realized.
3. A high-speed retro-modulated reflective transmission method based on a modulator according to claim 2, characterized in that: the modulation format and the modulation rate of the high-speed reverse modulation reflection module are determined by the modulation type and the highest modulation rate of the electro-optical modulator (6), wherein the modulation format is an on-off keying signal, a differential phase shift keying signal or a quaternary phase shift keying signal, and the modulation rate is at least 10 gigabits/second.
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| US10069562B2 (en) * | 2016-10-11 | 2018-09-04 | X Development Llc | Optical circulator for free space optical communication |
| CN109039439A (en) * | 2018-07-02 | 2018-12-18 | 曾昭雄 | Communication means, device and terminal |
| CN110266386B (en) * | 2019-07-10 | 2021-08-10 | 电子科技大学 | Reflective coherent optical communication system combining unidirectional optical signal amplification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104270193A (en) * | 2014-10-28 | 2015-01-07 | 长春理工大学 | Full-duplex cat-eye reverse modulation recovery free-space laser communication system |
| CN106656325A (en) * | 2016-11-14 | 2017-05-10 | 浙江大学 | High-speed single-light source two-way free space laser communication system |
| CN106712845A (en) * | 2016-11-14 | 2017-05-24 | 浙江大学 | RSOA-based high-speed amplified reverse modulation reflective module and implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270193A (en) * | 2014-10-28 | 2015-01-07 | 长春理工大学 | Full-duplex cat-eye reverse modulation recovery free-space laser communication system |
| CN106656325A (en) * | 2016-11-14 | 2017-05-10 | 浙江大学 | High-speed single-light source two-way free space laser communication system |
| CN106712845A (en) * | 2016-11-14 | 2017-05-24 | 浙江大学 | RSOA-based high-speed amplified reverse modulation reflective module and implementation method |
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