Metro Ring Node Module Based on Polymeric

is? cm and its length 2.5 cm. Propagation losses of the s-bend channel waveguides. tvmicallv 5 to 6 cm lane. were meas~ied~usind iib'ber dad-coupling technique [SI. Typically, light at 1.55 pm is coupled via a single mode fiber into the channel waveguide and output is recorded via either a single mode fiber or an objective lens. Using this technique, knowing the transmission of the objective lens and the fibers. both propagation and coupling losses are simultaneously measured. The lowest measured propagation losses are 0.4 dB/cm and coupling losses are typically around 1.5 dB. The coupling losses are primarily due to the mode mismatch between the Gaussian mode of fiber and the single mode solgel waveguide. The FWHM of the current sol-gel waveguide is estimated to be 6 pm to 7 Vm, while that of single mode fiber is 9 pm to I1 pm. Typical power uniformities are