Optical transmission system and optical network terminals used t

Details Optical transmission system and optical network terminals used t Optical transmission system and optical network terminals used t

1996-10-31

1998-05-12

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359157, 359179, 359173, H04J 1402

Patent

active

057514550

ABSTRACT:
An optical transmission system of an N : 1 or an N:N type is provided, in which there is no deterioration caused by beat noise between signals. A plurality of optical modulators are cascaded in an optical fiber transmission path having a light source and a plurality of light receivers connected to two respective ends of the optical fiber transmission path, and carrier waves having frequencies respectively different are applied to the optical modulators. This enables the light receivers to receive a radio frequency signal in which the carrier waves are frequency-multiplexed. The light receivers receive only the signal beam so that there is no occurrence of beat noise. In another arrangement, at the optical network terminal, a part of a signal beam is split and the split beam is intensity-modulated responsively to carrier waves by an optical modulator and, thereafter, is combined again to a passing beam. It is possible to obtain at the signal beam receiver a received signal in which carrier waves from respective optical network terminals are frequency-multiplexed. This prevents occurrence of inter-modulation distortion in the cascaded optical modulators.

REFERENCES:
patent: 4236243 (1980-11-01), Davies et al.
patent: 4742976 (1988-05-01), McMahon
patent: 5566381 (1996-10-01), Korotky

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