Investigation on spectral grids for VIS WDM applications over SIPOF

In recent years, a growing interest to develop wavelength division multiplexing (WDM) systems over large core Polymer Optical Fibers (POFs) is present. WDM technology for POF is already under investigation and development by several working groups. Besides key WDM components (e.g. demultiplexer (DEMUX)), which are essential to the success of WDM over POF, an important aspect is establishing a unique set of WDM transmission channels for the realization of standardized commercial WDM devices and systems. Among different types of POF, the 1 mm polymethylmethacrylate (PMMA) Step-Index POF (SI-POF) is the best known and by far the most widely used type of POF. In this paper spectral grids for visible spectrum (VIS) WDM applications over SI-POF are investigated. The criteria for evaluating the applicability of a spectral grid are first established. These refer to: attenuation in individual channels, performances of different multiplexer (MUX)/DEMUX solutions, availability of optical sources, capacity of the WDM system, and long-term compatibility. New-generated wavelength and frequency grids in 400 nm - 700 nm region, but also extensions of existing grids from infrared into VIS (Dense and Coarse WDM grid according to ITU-T Recommendations G.694.1 and G.964.2 respectively) are analyzed. The grid that best satisfies set criteria is proposed for further international discussion and revision.