Optical transmitter and optical transmission system using the sa

Details Optical transmitter and optical transmission system using the sa Optical transmitter and optical transmission system using the sa

1996-10-03

2000-06-20

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, H04J 1402

Patent

active

060784121

ABSTRACT:
In a system for simultaneously optically transmitting a plurality of digital modulation signals using an analog SCM transmission technique, the degree of degradation of the waveform of a transmission signal or the magnitude of distortion thereof differs depending on bands, whereby there arises a difference in transmission quality among channels. Therefore, an analog signal to be transmitted is converted into a digital signal by an analog-to-digital converting portion, after which the digital signal is divided, by a hierarchy separating portion, into a plurality of groups of digital information depending on degrees of importance in constructing the original analog signal. A modulating portion digitally modulates carriers having different frequencies which are respectively assigned to the groups of digital information. A multiplexing portion frequency-multiplexes and simultaneously optically transmits all the digital modulation signals. In this case, the carrier corresponding to the digital information having a higher degree of importance is set on a lower frequency side, and the carrier corresponding to the digital information having a lower degree of importance is set on a higher frequency side. Consequently, it is possible to minimize the effect of the degradation and the distortion caused in the transmission on received and reproduced data, whereby high-quality transmission is possible.

REFERENCES:
patent: 5016242 (1991-05-01), Tang
patent: 5351148 (1994-09-01), Maeda et al.

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