Analogue optical fibre communications by B. Wilson, Z. Ghassemlooy, I.Z. Darwazeh

By B. Wilson, Z. Ghassemlooy, I.Z. Darwazeh

Covers concerns thinking about enhancing the current variety of structures and know-how of optical fibre established telecommunications prone working with analogue-sourced signs

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Lightwave Technol, 1989, 7, pp. : 'Performance improvements in fiber optic links for multi-carrier TV transmission', 1991 IEEE MTT-S Int. Microwave Symposium Digest, pp. : 'Subcarrier multiplexed broad-band service network: a flexible platform for broad-band subscriber services', J. Lightwave Technol, 1993,11, pp. -J: Optoelectronics, 1993,140, pp. : 'H-Bus: an experimental ATM-based optical premises network", J. Lightwave Technol, 1989, 7, pp. : 'A hybrid architecture for analog video broadcast and B-ISDN services in customer premises networks', IEEEJ.

12 in terms 6f optical power since that is a directly measurable quantity. 15) The first two terms represent direct detection of the signal and local oscillator respectively. The third term is of more interest. First, its magnitude is proportional to the square root of the local oscillator power, thus the detected signal can be made larger simply by increasing the local oscillator power. Second, the detected signal is proportional to the square root of the source output power; thus linear modulation of the source electric field will yield linear modulation of the detected photo-current at the intermediate frequency.

Hence the baseband information is detected directly by the prefiltered signal illuminating the detector. The photodetector and any subsequent processing electronics need only have a bandwidth consistent with the 20 Subcarrier multiplexing baseband signal. This contrasts strongly with conventional SCM demultiplexing where a photodetector and amplifier combination with a bandwidth up to the highest subcarrier frequency is required. The method can also deal with frequency modulated subcarriers [12].

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