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Nishi-Tokyo-shi, Japan

Set S.Y.,Alnair Labs
Conference Program - MOC'11: 17th Microoptics Conference | Year: 2011

We introduce current commercial applications of carbon-nanotube (CNT) photonic technologies. In particular, two key applications of CNT mode-locked lasers will be described: high-speed optical sampling using a long-wavelength, low-repetition rate femtosecond CNT laser and 3D high-precision profile measurement using a high-repetition rate CNT laser. © 2011 The Japan Society of Applied Physics. Source

Chow K.K.,University of Tokyo | Chow K.K.,Nanyang Technological University | Yamashita S.,University of Tokyo | Set S.Y.,Alnair Labs
Optics Letters | Year: 2010

We demonstrated a single-walled carbon-nanotube-deposited planar lightwave circuit (PLC) waveguide for fourwave-mixing (FWM)-based wavelength conversion. FWMis generated from the interaction between the propagating light through the PLC waveguide and the deposited carbon nanotubes (CNTs) on the overcladding-removed core of the waveguide. The third-order nonlinearity of the CNTs is originated from the interband transitions of the π electrons causing nonlinear polarization similar to other highly nonlinear organic optical materials. FWM-based tunable wavelength conversion of a 10 Gbit/s non-return-to-zero signal is achieved with a power penalty of 3 dB in the biterrorrate measurements. To our knowledge, this is the first demonstration of a CNT-technology-based device for integrated photonic applications. © 2010 Optical Society of America. Source

Shi J.-W.,National Central University | Shi J.-W.,University of California at Santa Barbara | Kuo F.-M.,National Central University | Kuo F.-M.,University of California at Santa Barbara | And 4 more authors.
IEEE Photonics Journal | Year: 2012

We demonstrate a novel scheme for photonic generation of chirped millimeter-wave (MMW) pulse with ultrahigh time-bandwidth product (TBP). By using a fast wavelength-sweeping laser with a narrow instantaneous linewidth, wideband/high-power photonic transmitter-mixers, and heterodyne-beating technique, continuously tunable chirped MMW waveforms at the W-band are generated and detected through wireless transmission. Compared with the reported optical grating-based wavelength-to-time mapping techniques for chirped pulse generation, our approach eliminates the problem in limited frequency resolution of grating, which seriously limits the continuity, tunability, and TBP of the generated waveform. Furthermore, by changing the alternating current (AC) waveform of the driving signal to the sweeping laser, linearly or nonlinearly continuously chirped MMW pulse can be easily generated and switched. Using our scheme, linearly and nonlinearly chirped pulses with record-high TBPs (89-103 GHz/50 μs/7 × 10 5) are experimentally achieved. © 2009 IEEE. Source

Nguyen H.C.,Yokohama National University | Nguyen H.C.,Alnair Labs | Yazawa N.,Yokohama National University | Hashimoto S.,Yokohama National University | And 2 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2013

We report on our recent progress on Si Mach-Zehnder modulators (MZMs) incorporating sub-100 μm slow-light photonic crystal waveguide (PCW) phase-shifters. In the standard MZM with a PCW in each of the arms, we study the power-dependent bit-error-rate (BER) characteristics at 10 Gb/s, and measure BER = 1 × 10-9 and 1 × 10-8 even with phase-shifter lengths of 90 and 50 μm, respectively. Furthermore, by exploiting the low-dispersion slow-light in the 90 μm device, we measure a spectral operating bandwidth of 16.9 nm and temperature tolerance between 19-124°C, where the eye pattern amplitude is consistent to within ±25%. In the device with a 90 μm PCW in only one of the MZM arms, designed for large-ng operation, we achieve BER = 1 × 10 -9 at 10Gb/s and also observed barely but open eye patterns at 25 and 40 Gb/s. © 2013 IEEE. Source

Liu H.H.,Nanyang Technological University | Chow K.K.,Nanyang Technological University | Yamashita S.,University of Tokyo | Set S.Y.,Alnair Labs
Optics and Laser Technology | Year: 2013

We demonstrate a passively Q-switched erbium-doped fiber laser using a carbon-nanotube-based saturable absorber via evanescent field interaction. The carbon nanotubes are deposited on a side-polished fiber by optically-driven deposition method. Since only the evanescent field of the propagating light interacts with carbon nanotubes in saturable absorber, the fiber laser can maintain a relatively high intra-cavity power and output pulses with energy of 81.3 nJ are obtained with a repetition rate of 70.4 kHz and a pulse width of 4.5 μs. © 2012 Elsevier Ltd. Source

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