Patent ID: 6392770
Filing Date: 2002-05-21
Classification: H04B,H04J

Abstract:
A multi-point optical transmission system for optically transmitting code-division multiplex signals from a plurality of slave stations to a master station,said slave stations having each varied carrier frequency assigned, each of said slave stations comprising: frequency conversion means for subjecting each code-division multiplex signal having a predetermined frequency to be transmitted to said master station to frequency conversion to equalize the predetermined frequency thereof with the carrier frequency assigned to one own station; drive means for applying a bias to a signal obtained after the conversion by said frequency conversion means; and electrical-optical conversion means for converting an electrical signal obtained through the bias applied by said drive means into an optical signal whose intensity is modulated by the electrical signal, and said master station comprising: optical multiplex means for multiplexing optical signals obtained after conversion by said electrical-optical conversion means; optical-electrical conversion means for converting an optical signal obtained after multiplexing by said optical multiplex means into an electrical signal; band pass filter means for extracting a signal equal in frequency to the carrier frequency assigned to each of said slave stations from the electrical signal obtained after conversion by said optical-electrical conversion means; and frequency re-conversion means for subjecting each signal extracted by said band pass filter means to frequency re-conversion to equalize each frequency thereof with said predetermined frequency.