ISSN 
1998 Vol. 27, No. 5
1998, 27(5): 453-461.
Abstract:
In this paper, the characteristics, advantages and key technologies of free-space laser communication are described The status on the field of free-space laser communications on several main countries are introduced, as well as the development and basement of lasercom in our country Through wholly and strong persuading analysis, it is shown that free-space developing lasercom is in demand, and its appllication is also the possibility.
In this paper, the characteristics, advantages and key technologies of free-space laser communication are described The status on the field of free-space laser communications on several main countries are introduced, as well as the development and basement of lasercom in our country Through wholly and strong persuading analysis, it is shown that free-space developing lasercom is in demand, and its appllication is also the possibility.
1998, 27(5): 462-466.
Abstract:
Acquisition, pointing and tracking-ATP technology is one of the key techniques of free-space laser communication system The architecture and main parameters of ATP system for free-space laser communications are analyzed and discussed in this paper America, Japan and Europe countries dominate the field of free-space laser communications, and their latest development of ATP technology is described by introducing its topic system、The feasibility of space laser communication is also proved.
Acquisition, pointing and tracking-ATP technology is one of the key techniques of free-space laser communication system The architecture and main parameters of ATP system for free-space laser communications are analyzed and discussed in this paper America, Japan and Europe countries dominate the field of free-space laser communications, and their latest development of ATP technology is described by introducing its topic system、The feasibility of space laser communication is also proved.
1998, 27(5): 467-472.
Abstract:
ATP (Acquisition, Tracking and Pointing) technology plays a key role in space laser communication The structure of ATP system of space laser communication is discussed in this paper, and some important techniques such as system stabilization and system dynamic synthesis are analyzed in details.
ATP (Acquisition, Tracking and Pointing) technology plays a key role in space laser communication The structure of ATP system of space laser communication is discussed in this paper, and some important techniques such as system stabilization and system dynamic synthesis are analyzed in details.
1998, 27(5): 473-477.
Abstract:
One of the key phases for free-space optical communication system development is investigation of a series of key technology and integrated optimation technology, as well as evaluation of the system performance through experiments of the ground simulation system This paper describes the design and development of the key ATP subsystem of the ground simulation system It also presents estimated performance and considerations of future update.
One of the key phases for free-space optical communication system development is investigation of a series of key technology and integrated optimation technology, as well as evaluation of the system performance through experiments of the ground simulation system This paper describes the design and development of the key ATP subsystem of the ground simulation system It also presents estimated performance and considerations of future update.
1998, 27(5): 478-481.
Abstract:
This paper describes error analysis of laser beam pointing in free-space optical communication A typical ATP system and its key techniques is also presented.
This paper describes error analysis of laser beam pointing in free-space optical communication A typical ATP system and its key techniques is also presented.
1998, 27(5): 482-486.
Abstract:
According to the demands of the optical communication links between satellites, the key techiques are analyzed briefly The preliminary design of the optical antenna of a demonstrator system is also introduced in this paper This demonstrator system has the automatic tracking function, in which the dominant parameters are given.
According to the demands of the optical communication links between satellites, the key techiques are analyzed briefly The preliminary design of the optical antenna of a demonstrator system is also introduced in this paper This demonstrator system has the automatic tracking function, in which the dominant parameters are given.
1998, 27(5): 487-490.
Abstract:
In this paper, the relative intensity distribution of an off-axis Gaussian beam after passing through a primary spherical aberration system is presented By numerical integration, the relationship curve between the relative intensity and the aberration of the system and the incident position is given Based on the relations and Rayleigh rule, the analysis and rational proposals for the design of laser scanning systems are also given.
In this paper, the relative intensity distribution of an off-axis Gaussian beam after passing through a primary spherical aberration system is presented By numerical integration, the relationship curve between the relative intensity and the aberration of the system and the incident position is given Based on the relations and Rayleigh rule, the analysis and rational proposals for the design of laser scanning systems are also given.
1998, 27(5): 491-493.
Abstract:
In laser space communication systems, the optical collimation of semiconductor laser is important In this paper, general ways of the collimation is described, and the semiconductor laser of 35mW is collimated using one len The results are given The efficiency of the collimation is about 60% and the angle of divergence is about 0 4~0 75mrad.
In laser space communication systems, the optical collimation of semiconductor laser is important In this paper, general ways of the collimation is described, and the semiconductor laser of 35mW is collimated using one len The results are given The efficiency of the collimation is about 60% and the angle of divergence is about 0 4~0 75mrad.
1998, 27(5): 494-501.
Abstract:
By analyzing the delayed self-heterodyne method and investigating partial coherent theory, a novel technique delayed optical fiber interferometer is proposed This paper also deduces the formula describing the measurement of spectral linewidth of semiconductor laser width delayed optical fiber interferometer, which is demonstrated by simultaneous computation and experimental results.
By analyzing the delayed self-heterodyne method and investigating partial coherent theory, a novel technique delayed optical fiber interferometer is proposed This paper also deduces the formula describing the measurement of spectral linewidth of semiconductor laser width delayed optical fiber interferometer, which is demonstrated by simultaneous computation and experimental results.
1998, 27(5): 502-505.
Abstract:
In this paper, the functions and fundamental structure of atmospheric laser communication system are discussed The features and performances of laser sources and detectors-the core components of the system are presented Commonly, the laser communication systems with the functions of ATP are practiced by separating the signal beam and the beacon beam The characteristics of the available detectors-CCD, PSD, 4Q-PIN, 4Q-APD are analyzed The selecting rules are mainly the receiving FOV, sensitivity and position resolution.
In this paper, the functions and fundamental structure of atmospheric laser communication system are discussed The features and performances of laser sources and detectors-the core components of the system are presented Commonly, the laser communication systems with the functions of ATP are practiced by separating the signal beam and the beacon beam The characteristics of the available detectors-CCD, PSD, 4Q-PIN, 4Q-APD are analyzed The selecting rules are mainly the receiving FOV, sensitivity and position resolution.
1998, 27(5): 506-509.
Abstract:
This paper analyzes the sources of background noise and its characters of background noise in optical communication systems of space,and the influence of background noise to systems is studied The optical of filter, the receiver field of view,and the working bandwidth of systems of working conditions which restrain the background noise are discussed and the basic parameter principles of choice are also given.
This paper analyzes the sources of background noise and its characters of background noise in optical communication systems of space,and the influence of background noise to systems is studied The optical of filter, the receiver field of view,and the working bandwidth of systems of working conditions which restrain the background noise are discussed and the basic parameter principles of choice are also given.
1998, 27(5): 510-515.
Abstract:
In this paper, through theoretical arithmetic and experiments, we develop the position resolution to the beam in coarse-tracking subsystem of spatial optical communication that used PSD From the experiments, when the power of the beacon beam on the photosurface of the PSD is about 2.8μW,the spatial position resolution is about 12.6μm Meanwhile, through computer simulation and experiments, we have compared the experimental data and the theoretical data of the linearity of PSD.
In this paper, through theoretical arithmetic and experiments, we develop the position resolution to the beam in coarse-tracking subsystem of spatial optical communication that used PSD From the experiments, when the power of the beacon beam on the photosurface of the PSD is about 2.8μW,the spatial position resolution is about 12.6μm Meanwhile, through computer simulation and experiments, we have compared the experimental data and the theoretical data of the linearity of PSD.
1998, 27(5): 516-521.
Abstract:
This paper analyses the multiple pulses PPK coded modulation characteristics, such as signal space, redundancy, ratio of data rates and band The caculation for ratio of data rates is given Under certain conditions, multiple pulses PPK has higher date rates than single pulse PPKand OOK, and it has not bandwidth spread Suitable parameter choice can space much larger redundancy than that of the multiple pulses PPK itself, and thus provide the capability of correct coded control.
This paper analyses the multiple pulses PPK coded modulation characteristics, such as signal space, redundancy, ratio of data rates and band The caculation for ratio of data rates is given Under certain conditions, multiple pulses PPK has higher date rates than single pulse PPKand OOK, and it has not bandwidth spread Suitable parameter choice can space much larger redundancy than that of the multiple pulses PPK itself, and thus provide the capability of correct coded control.
1998, 27(5): 522-525.
Abstract:
In this paper, the interface design of the ATP system in space laser communication is discussed The practical structures of the interface circuits, their functions and the components are analyzed in detailed.
In this paper, the interface design of the ATP system in space laser communication is discussed The practical structures of the interface circuits, their functions and the components are analyzed in detailed.
1998, 27(5): 526-531.
Abstract:
By analyzing the multiple access environment, strong background noise etc, and comparing the features of several multiplexing techniques, the possibility, pribilege and technical difficulties of CDMA in free-space wireless optical communication are discussed The scheme of CDMA combined with SDMA is presented, as well as the system model.
By analyzing the multiple access environment, strong background noise etc, and comparing the features of several multiplexing techniques, the possibility, pribilege and technical difficulties of CDMA in free-space wireless optical communication are discussed The scheme of CDMA combined with SDMA is presented, as well as the system model.
1998, 27(5): 532-536.
Abstract:
In this paper, a feed-foreword compensation method to restrain the jitter of the optical platform in inter-satellite laser communication is discussed Using this method, by producing jitter compensation signal from self-tuning feed-forward controller, the jitter signal can be reduced effectively.
In this paper, a feed-foreword compensation method to restrain the jitter of the optical platform in inter-satellite laser communication is discussed Using this method, by producing jitter compensation signal from self-tuning feed-forward controller, the jitter signal can be reduced effectively.
1998, 27(5): 537-540.
Abstract:
Laser signal is affected by the scintillation in the course of atmospheric transmission,thus the performances of the laser detecting system are unstable In this paper,the effect of atmospheric scintillation to laser signal detection is roughly estimated and calculated The corresponding changes of signal detection are also demonstrated.
Laser signal is affected by the scintillation in the course of atmospheric transmission,thus the performances of the laser detecting system are unstable In this paper,the effect of atmospheric scintillation to laser signal detection is roughly estimated and calculated The corresponding changes of signal detection are also demonstrated.
1998, 27(5): 541-545.
Abstract:
In this paper, the development of the laser communications explored by NASA and MIT Lincoln Lab is described The key techniques and key components units of the laser communication system are introduced for LCDS system Its composite proceeding for optical,mechanical,electrical elements and the optimization of the whole system and the main performances are also discussed.
In this paper, the development of the laser communications explored by NASA and MIT Lincoln Lab is described The key techniques and key components units of the laser communication system are introduced for LCDS system Its composite proceeding for optical,mechanical,electrical elements and the optimization of the whole system and the main performances are also discussed.
1998, 27(5): 546-551.
Abstract:
Japan develops rapidly in the field of free-space laser communications By using the ETS-VI/LCE system, an optical link between GEO and optical ground station is established The data and results obtained from the system accelerate the application of free-space laser communication technique This paper summarizes the development of free-space laser communications of Japan and its ETS-VI/LCE system.
Japan develops rapidly in the field of free-space laser communications By using the ETS-VI/LCE system, an optical link between GEO and optical ground station is established The data and results obtained from the system accelerate the application of free-space laser communication technique This paper summarizes the development of free-space laser communications of Japan and its ETS-VI/LCE system.
1998, 27(5): 552-556.
Abstract:
This paper summarizes the history, status and future of the ESA(European Space Agency) developments in inter-satellite laser communications Particularly, the plan, implement and schedule of the biggest project that ESA performed in optical communications at present are given In the end, some development plans in key technology of elements and systems related to the inter-satellite laser communications of ESA are also presented.
This paper summarizes the history, status and future of the ESA(European Space Agency) developments in inter-satellite laser communications Particularly, the plan, implement and schedule of the biggest project that ESA performed in optical communications at present are given In the end, some development plans in key technology of elements and systems related to the inter-satellite laser communications of ESA are also presented.
1998, 27(5): 557-560.
Abstract:
In this paper the overview of SOLACOS(German free-space laser communication system),the developing plan and key techniques of SOLACOS are presented SOLACOS accomplishes a computer simulation system and a breadboard in laboratory based on available technology The key technolique for free-space laser communication between satellites are determined and developed by computer simulation and experiments on breadboard.
In this paper the overview of SOLACOS(German free-space laser communication system),the developing plan and key techniques of SOLACOS are presented SOLACOS accomplishes a computer simulation system and a breadboard in laboratory based on available technology The key technolique for free-space laser communication between satellites are determined and developed by computer simulation and experiments on breadboard.
1998, 27(5): 561-565.
Abstract:
Because of the society of information, the emerging of Internet, Intranet and multimedia service, multifunction of satellite communications is demanded In this paper, the commercial prospects of the satellite laser communications in the broadband satellite communication and inter-satellite links are analyzed.
Because of the society of information, the emerging of Internet, Intranet and multimedia service, multifunction of satellite communications is demanded In this paper, the commercial prospects of the satellite laser communications in the broadband satellite communication and inter-satellite links are analyzed.
