The device which forms the wavelength division multiplex signal whose channel interval is narrow

摘要

(57) Abstract Optical signal (from KS11 KS1n; KS2n) the plural wave length multiplexers which are supplied (WM1 and WM2) the optical coupler is connected from KS21. This optical signal (from KS11 KS1n; From KS21 KS2n), the wavelength division multiplex signal (WMS) it is interleaved alternately in order to form. The optical signal by the wave length multiplexer (WM1 and WM2) possessing the channel bandwidth of 2 times the wavelength division multiplex signal (WMS) in comparison with the multiplexer which is used in order to form in one stage, restricts the spectrum of the result optical signal (from KS11 KS1n; KS2n) it does not cause quality deterioration from KS21.