free-space laser communication
Highly Efficient Free Space Laser Communication
... the laser torch. This in turns modulates the laser beam, since laser torch acts like a balanced modulator, where two signals – one is message signal (audio signal) and carrier laser signal, ...
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Analysis of the effect of BER and Q-factor on free space optical communication system using diverse wavelength technique
... Abstract. This paper presents the analysis of the effect of BER and Q-factor on free space optical communication system using the diverse wavelength technique. The visibility is gradually decreased ...
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DP DQPSK Optical Access System Integrated with Fiber and Free Space Downlink for High Spectral Efficiency Application
... The setup for the seamless integration of DP-DQPSK optical fiber link with FSO communication system is shown in Figure 2. At the transmitter, a continuous-wave (CW) light beam from a distributed feedback (DFB) ...
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Performances of Free-Space Optical Communication System Over Strong Turbulence
... Proposed experiment. As shown on the Fig. 2-3, FSOC system is fiber detection. Optical modem of full-duplex TX/RX at λ of 1550 nm and rate transmission of 1000 Mbps. For each unit of TX and RX is connected to UTP of PC’s ...
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Free Space Optical Communication System under Different Weather Conditions
... CW Laser, Mach-Zender Modulator at transmission part; while, PIN photo detector and Low Pass Bessel Filter at the receiver ...wave laser as a carrier ...the free space ...
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Investigating Wavelength Dependency of Terrestrial Free Space Optical Communication Link
... The greatest problem that FSO system has to face comes from the atmospheric channel, which results in signal, absorption, scattering and fluctuation. The optical beam travelling through the atmosphere comes across ...
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An Algorithm of Wireless Sensor Network Based on Free Space Optical Communication
... increasing communication distance and system ...restrictive. Free-Space Optical Commu- nication (FSO) is the two-way communication technology, it uses laser beam as carri- er to precede ...
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Saturation in cascaded optical amplifier free space optical communication systems
... FSO communication system is shown in ...the laser beam through a fibre into the OA) is assumed to be perfectly aligned with the transmitting lens and an optical band pass filter (OBPF) is used to reduce the ...
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A Survey of Free Space Optical Communication Network Channel over Optical Fiber Cable Communication
... The laser has an important property of highly directional beams. Free space optical system receiver is designed in such a way to get a small divergence and concentrate less optical energy on a ...
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SPATIAL DIVERSITY TECHNIQUES IN MIMO WITH FREE SPACE OPTICAL COMMUNICATION
... The link has been designed for 4X4 MIMO FSO system shown in figure 3. Here the channel matrix is of 4X4 and the length of the channel is 1 Km. The PRBS generator generates randomdata which is converted into electrical ...
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Simulation research of free space optical communication based on linear polarization shift keying modulation
... Light, being an electromagnetic wave has a vector characteristic. Thus, the linear polarization shift keying enables us to encode digital bits as polarization states (vertical and horizontal) that are preserved over the ...
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Optical Transceiver Design And Geometric Loss Measurement For Free Space Optic Communication
... of free space optical channel characteristic in term of the geometric ...point communication system in free space using infrared LED or laser as light ...operation, free ...
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Architectural Analysis of Spectrum Sliced Wavelength Division Multiplexed Free Space Optical Communication
... In this paper we have analyzed a spectrum sliced WDM FSO system with various modulation formats such as RZ, NRZ, CSRZ, and DRZ at 2.5 Gb/s bit rate by varying link range 1 to 5 km with clear weather atmospheric ...
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Degradation Measures in Free Space Optical Communication (FSO) and its Mitigation Techniques A Review
... buildings or even inside offices. FSO devices look like security video cameras and basically consist of an optical transceiver with a laser transmitter and receiver to provide full duplex capability. FSO unit ...
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Free Space Optical Communication System at Different Atmospheric Turbulence for Diverse Temperature Conditions
... The effect of atmospheric turbulence over optical wave propagation has been an area of research. The majority of effort in this area has been focused on a vertical propagation path system for astronomical imaging and ...
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High-speed Orbital Angular Momentum Multiplexed Free-space Optical communication systems
... At the receiver side, the received signal is amplified by an EDFA to compensate the loss and its power is adjusted by a VOA. The ASE noise-loading stage is constructed by two EDFAs cascaded with a VOA. The ASE noise and ...
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Performance Evaluation of Free Space Optical Wireless Communication
... the laser diode (LD). The light from the LD is transmitted in free space, which is assumed to be log- normally ...for space–ground transmission and the Gaussian beam model gives a good ...
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Comparison of Polarization Shift Keying and Amplitude Shift Keying Modulation Techniques in FSO
... optical communication system is an optical communication technology which uses air as a medium to transmit signal from one place to other in the form of light ....Wireless laser communication ...
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Role of Wavelength Division Multiplexing Scheme in Free Space Optical Communication Systems
... software as shown in Fig. 1. The system contains two transmitter channels each consists of pseudo-random bit sequence (PRBS) generator. PRBS provides 10 Gbps of data rates which is subjected to return-zero (RZ) encoder. ...
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Dramatic Atmospheric Turbulence Effects on Submarine Laser Communication Systems (SLCS) and Free Space Optics (FSO)
... a laser beam through the ...(LOS) communication between the transmitter and receiver as shown in the ...the laser beam passing through it, so the quality of data received is ...
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