SUBMARINE OPTICAL BRANCHING DEVICE AND SUBMARINE OPTICAL NETWORK

PROBLEM TO BE SOLVED: To execute a multi-address communication to all the stations connected to an optical transmission cable. SOLUTION: An optical signal of a wavelength λbc broadcasted from an optical transmission terminal station equipment 1-(n+1) of the main station A is partially branched to a branch station by an optical fiber grating 5-6 within a submarine optical branching equipment 5. The optical signal of the wavelength λbc which is not branched is propagated through an optical fiber 4-1 and partially branched to a branch station D similarly at a submarine optical branching equipment 6. The residual optical signal of the wavelength λbc is propagated through the optical fiber 4-1 to be transmitted to a main station B. Thereby multi-address communication is executed.