A minimum channel spacing of optical wavelength‐division‐multiplexing transsion for subscriber loop systems

Abstract

AbstractThis paper describes standardization of wavelengths in wavelength‐division‐multiplexing transmission for optical subscriber loop systems. First we estimate the minimum channel spacing for both the short and long wavelength regions considering such system requirements as transmission distance, transmission signals and future trend of optical components (e.g., optical source, optical multi/demultiplexer, optical connector and optical fiber) and select eight wavelengths in the short wavelength region (0.75, 0.77, 0.79, 0.81, 0.83, 0.85, 0.87 and 0.89 μm) and eight wavelengths in the long wavelength region (1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40 and 1.45 μm). Then, considering presently required transmission signals and the present state of the art of optical sources and optical components, it is concluded that the use of two wavelengths in the short wavelength region (0.81 and 0.89 μm) and two in the long wavelength region (1.2 and 1.3 μm) will suffice for the time being, and that with the required technological advances, necessary wavelengths will be developed and used from among the 16 wavelengths.