conductor laser was coupled into the input waveguides through a single-mode fiber. To control the polarization state of the input light, a polarizer and a polarization controller were used at the input fiber. The near-field mode patterns at the output channels were observed with an infrared vidicon after being magnified by an a ϫ 10 microscopic objective lens. The input and output fibers were precisely aligned and butt-coupled to the end faces of the input and output waveguides of the device. The output power and spectrum data were measured and collected by an optical-spectrum analyzer, which was interfaced to a computer. The 12 near-field patterns at the center position are transformed to the intensity distribution of the corresponding wavelength, as shown in Figure 8. The output power over the 12 channels is almost uniform. The spectrum data of the single output channel show that the insertion loss of the multiplexer is 12-17 dB and the cross talk is less than Ϫ20 dB. The measured wavelength-channel spacing is 0.796 nm, and the center wavelength and 3-dB bandwidth are 1548 and 0.3 nm, respectively. CONCLUSIONIn this work, the method and formulae for parameter optimization of the AWG multiplexer have been presented. A polymer AWG was fabricated using synthesized cross-linkable fluorinated poly (ether ether ketone) (FPEEK) with a high thermal stability up to 500°C. The insertion loss of the multiplexer is 12-17 dB and the crosstalk is less than Ϫ20 dB. The measured wavelength-channel spacing is 0.796 nm, and the center wavelength and 3-dB bandwidth are 1548 and 0.3 nm, respectively. NUMERICAL DESIGN FOR EFFICIENTLY
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