Journal ArticleDOI
Speckle Noise Reduction in Fiber Optic Analog Video Transmission Using Semiconductor Laser Diodes
Ken-ichi Sato,Koichi Asatani +1 more
TLDR
It is experimentally confirmed that the proposed modulation method is effective in reducing speckle noise, and the results of the transmission tests have confirmed the feasibility of analog video transmission using semiconductor laser diodes.Abstract:
This paper investigates the effects of speckle noise on analog video transmission systems using semiconductor laser diodes. The system linearity degradation due to speckle noise is examined using different fiber types. Then this paper proposes a new modulation technique employing a superimposed pulse scheme to reduce speckle noise. It is experimentally confirmed that the proposed modulation method is effective in reducing speckle noise. Based on the above investigations, analog video transmission experiments are performed using single-mode fibers, step-index multimode fibers, and graded-index multimode fibers in the 0.8 and 1.3 μm wavelength regions. The results of the transmission tests have confirmed the feasibility of analog video transmission using semiconductor laser diodes.read more
Citations
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Journal ArticleDOI
Speckle Reduction in Laser Projection Systems by Diffractive Optical Elements
TL;DR: A new method for eliminating speckles in the far field by using a diffractive optical element is proposed, which can be reduced to a few percent while good beam quality is preserved.
Journal ArticleDOI
Receiver design for high-speed optical-fiber systems
TL;DR: In this article, the authors re-examine the optical receiver design in view of these different requirements, namely, high receiver sensitivity, wide dynamic range, transparent to the operating bit rate, unrestricted data format, and fast acquisition time.
Journal ArticleDOI
Bit-Error-Rate Degradation in a Multimode Fiber Optic Transmission Link Due to Modal Noise
TL;DR: The power penalty due to modal noise can be considerably reduced by suitable system modifications, e.g., by optimization of the decision threshold setting or by application of a low coherent light source operating with several spectral emission lines of low coherence and low partition noise.
Journal ArticleDOI
Intensity noise of semiconductor laser diodes in fiber optic analog video transmission
TL;DR: In this paper, the effects of laser diode noise on analog video transmission in the HF and VHF bands were investigated, which resulted in the development of several designs of graded-index multimode fiber systems that can ignore reflection induced laser noise.
References
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Journal ArticleDOI
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TL;DR: The cylindrical lens method is shown to be most efficient, with a coupling loss of 1.8 dB under optimum alignment conditions, and the optimum radius of a cylINDrical lens, which gives maximum coupling efficiency, is derived by theoretical calculation, using the ray matrix method.
Journal ArticleDOI
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TL;DR: In this article, the average connection loss of a C-type, plug-in type, and U-link connector has been found to be 0.4, 0.34, and 0.62 dB, respectively.
Journal ArticleDOI
Nonlinearity and Its Compensation of Semiconductor Laser Diodes for Analog Intensity Modulation Systems
TL;DR: A simple linearizing technique for improving the nonlinearity of laser diodes, using an emphasis principle, is proposed and was experimentally examined, yielding promising results.