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We demonstrate mode switching in tandem quasi-stadium laser diodes. Switching is achieved by optical injection between lasing in the cavity axis and the closed ring trajectory of a quasi-stadium laser resonator.
We have made cross-shaped polarization-switching VCSELs for dual-channel optical communications. The polarization of the device is controlled by its asymmetry in geometry and current injection. High switching power ratio of over 20 between two polarization states has been achieved.
We demonstrate fabrication of the first AlN-waveguide-based intersubband transition device. The device can operate at 1.3 mum, confirmed with the new waveguide-coupling measurement method. The intersubband absorption saturation in the device is also successfully demonstrated.
We propose a new label recognition system for photonic packet routing using self-routing of labels. Whole binary-coded labels modulated in phase can be recognized with a circuit consisting of tree-structure passive asymmetric-waveguide X-junctions.
A switchable multiwavelength erbium-doped fiber laser with a multimode FBG and highly nonlinear PCF is demonstrated. Stable five-wavelength operation with 0.8 nm spacing was achieved. Switching between stable one- to four-wavelength operations is also demonstrated.
We demonstrate an all-optical polarization controller using the injection-locking induced transverse-mode switching of 1.5 mum elliptical-apertured VCSEL. The polarization of an output fundamental-mode was stabilized even for randomly polarized input light injected into a high-order transverse mode.
Utilizing soft-lithography based nanofluidics and silicon nanophotonics we demonstrate ultracompact tunable spectral filtering. Liquid based addressing and high refractive index modulation of a single row of holes within a planar photonic crystal is demonstrated.
Utilizing terahertz time domain spectroscopy, we characterized the electromagnetic response of planar split ring resonators fabricated on GaAs. Optical excitation is sufficient to turn off the electric resonance demonstrating the potential of SRR terahertz switches.
We have demonstrated all-optical on-off switching at 10 Gbit/s using four-wave mixing in only 1.9 m of bismuth-based highly nonlinear fiber. The all-optical on-off switch has a fast response time and high ON/OFF switching ratio.
We realized, for the first time, NOLM-type all optical switching with carbon nanotubes loaded planar waveguide. ~20% splitting ratio contrast has been achieved using just 1 cm-long carbon nanotubes loaded planar waveguide.
Recent leading-edge status of waveguide-loss and cavity-Q for photonic crystals and all-optical switching action in resonator-waveguide-coupled systems are described. All-optical digital processing chips and novel ways of dynamic controlling light will be also discussed.
The first experimental measurement of electron spin relaxation in GaInNAs quantum wells is reported. An all-optical polarization switch based on the excitation of spin-polarized electrons is demonstrated.
We report 1.25 Gbps transmission over a multimode air clad holey fiber(MACHF) using a 1times4 MACHF power splitter that showed a low insertion loss of 9.9 dB and excess loss of 3.9 dB. Eye opening for 20 m transmission at 850 nm was measured.
A 3times3 SOA-based switch is demonstrated for routing both radio-over-fiber and digital signals simultaneously. High extinction ratio digital baseband signals are transmitted and sufficient linearity is found for high performance RF signal distribution.
We propose and demonstrate self-clocked serial-to-parallel/parallel-to-serial conversion (time demux/mux) of asynchronous optical packets with an optically-clocked transistor array. Clock generation, demux/mux are performed with a compact, low-power OEIC, enabling a high-performance asynchronous optical label swapper.
Sub-picosecond all-optical switching at telecommunication wavelengths has been demonstrated by utilizing an intersubband transition of II-VI-based MQW fabricated in high-mesa waveguide devices with separate confinement heterostructure, where (CdS/ZnSe)/BeMgTe QW is employed as active layer.
We proposed and experimentally demonstrated polarization shift keying (PolSK) label over vestigial sideband carrier suppressed return-to-zero (VSB-CSRZ) payload for 43 Gb/s all-optical label switching network. This is a candidate technique for the next generation optical network.
A novel optical buffer memory with a shift register function using a two-dimensional array of polarization bistable VCSELs is proposed. 1-bit optical buffering, which is an essential part of the memory, has been experimentally demonstrated.
We demonstrate high extinction-ratio orthogonal label switching of DRZ/DPSK generated by a dispersion-flattened photonic-crystal-fiber (PCF). Label removal and re-insertion are demonstrated with improved receiver-margin compared to conventional NRZ/DPSK because of the higher extinction-ratio.
We have developed a new approach to visualizing the 180deg ferroelectric domain structures using terahertz radiation as a sensitive probe, in which the spatial resolution is dominated by the diameter of the focused laser spot.
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