Fiber couplers made with photonic crystal fibers (PCF) are reported. Two types of PCF were fabricated by means of stacking a group of silica tubes around a silica rod and drawing them. The fiber couplers were made by use of the fused biconical tapered method. With a fiber that had five hexagonally stacked layers of air holes, a 33/67 coupling ratio was obtained, and with a one-layer four-hole fiber, a 48/52 coupling ratio was obtained. The fabrication processes and the characteristics of the PCFs and the PCF couplers are presented.
We propose an optical power stabilized LD module without APC circuit and monitor PD. It utilizes the temperature dependence of LD wavelength. With the designed filter, the power penalty is suppressed to Odl3 at full operating temperature range and the optical signal power level reduction is only 1.2dB at 15°C and Odl3 at 70°C in 1.3pm InGaAsP/InP FP MQW LD. We also demonstrate the method by means of the fiber-coupler-filter.
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