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We achieved successful low-input-power (-10 dBm) wavelength conversion at 10 Gb/s by using a hybrid integrated cross-phase modulation wavelength converter (XPM-WC). The input CW power was also -10 dBm and the total current was only 215 mA, and no signal preamplifiers were used. From the relationship between the eye-opening ratio and the injection current to the SOA, we clarified the optimal current condition for low-input-power operation. The XPM-WC consists of a two-channel spot-size converter integrated semiconductor optical amplifier (SS-SOA), which is mounted on a planar lightwave circuit (PLC) platform. We also fabricated an 8-slot unit. XPM-WC modules are inserted in every slot and can operate independently. Stable and uniform low-input-power operation is confirmed in all slots. [ABSTRACT FROM PUBLISHER]

We propose an approach to optical wave field spot-size conversion that uses a waveguide structure. An optical wave field is decomposed with a Hermite-Gaussian basis, and we describe its motion with partial differential equations for the field radius and center parameters derived from the propagation of the lower order components. We use the equations to design a spot-size conversion waveguide structure for expanding and reducing a field spot as an example in a quasi-single-mode optical waveguide. [ABSTRACT FROM PUBLISHER]

The authors successfully fabricate a 100-GHz spacing eight-channel light source integrated with gratings and laser diodes on a planar lightwave circuit platform. They obtain mode-hopping free-single mode oscillations, precisely controlled wavelengths, and sufficient output power of more than 1.5 mW at 80 mA. [ABSTRACT FROM PUBLISHER]

We developed a compact 16-ch optical wavelength selector (OWS). Our OWS is composed of two arrayed-waveguide gratings (AWG's) and an optical gate array (OGA) integrated on a single PLC platform by using the hybrid integration technique. We successfully obtained lossless operation with an extinction ratio of better than -45 dB for all wavelength channels. We also obtained a switching time of less than 1 ns. These excellent characteristics are the same as those of a previously reported OWS fabricated using PLC-PLC direct attachment [ABSTRACT FROM PUBLISHER]