Multichannel AM video transmission using a high-power Nd:YAG laser and linearized external modulator

A high-power Nd:YAG laser with a linearized external modulator-based system is demonstrated for a transmission of 50 channels of vestigal sideband amplitude modulated (VSM AM) video. The 1320-nm diode-pumped Nd:YAG laser is an attractive source for AM video transmission due to the high output power...

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Bibliographic Details
Published inIEEE journal on selected areas in communications Vol. 8; no. 7; pp. 1369 - 1376
Main Authors Childs, R.B., O'Byrne, V.A.
Format Journal Article
LanguageEnglish
Published New York, NY IEEE 01.09.1990
Institute of Electrical and Electronics Engineers
Subjects
Amplitude modulation
Applied sciences
Broadcasting. Videocommunications. Audiovisual
Diodes
Exact sciences and technology
Laser noise
Linearization techniques
Optical distortion
Optical modulation
Power generation
Power lasers
Predistortion
System testing
Telecommunications
Telecommunications and information theory
Videocommunications (networks and services)
Videocommunication
System description
Laser
Optical modulator
Experimental study
Performance
Signal distortion
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Summary:A high-power Nd:YAG laser with a linearized external modulator-based system is demonstrated for a transmission of 50 channels of vestigal sideband amplitude modulated (VSM AM) video. The 1320-nm diode-pumped Nd:YAG laser is an attractive source for AM video transmission due to the high output power ( approximately 200 mW) and low relative intensity noise (<-170 dB/Hz). However, the required external modulator generates third-order distortion products, which limit the performance of such a system. A predistortion linearization technique is described. It reduces the modulator generated third-order distortion products by 16.4 dB, allowing a modulation index of 3.37% per channel. When combined with the Nd:YAG laser, this yields a 50-channel video transmission system with a 12 dB optical power budget for video carrier-to-noise ratios of 52 dB and composite distortion products (CSO and CTB) of less than -60 dBc. The demonstrated power budget is sufficient to allow four-way power splitting, with the remaining margin comparable to the test results obtained with DFB (distributed-feedback) laser-based AM transmission systems.< >
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0733-8716
1558-0008
DOI:10.1109/49.59139