Takeshi Fujisawa

Best Publications

• All-optical logic gates based on nonlinear slot-waveguide couplers

  Takeshi Fujisawa;Masanori Koshiba

  150
  Citations

• Polarization-independent optical directional coupler based on slot waveguides

  Takeshi Fujisawa;Masanori Koshiba

  139
  Citations

• Chromatic dispersion profile optimization of dual-concentric-core photonic crystal fibers for broadband dispersion compensation

  Takeshi Fujisawa;Kunimasa Saitoh;Keisuke Wada;Masanori Koshiba

  135
  Citations

• 50-Gb/s Direct Modulation of a 1.3-μm InGaAlAs-Based DFB Laser With a Ridge Waveguide Structure

  W. Kobayashi;T. Ito;T. Yamanaka;T. Fujisawa

  133
  Citations

• Design and Fabrication of 10-/40-Gb/s, Uncooled Electroabsorption Modulator Integrated DFB Laser With Butt-Joint Structure

  W. Kobayashi;M. Arai;T. Yamanaka;N. Fujiwara

  116
  Citations

• Transmission of 214-Gbit/s 4-PAM signal using an ultra-broadband lumped-electrode EADFB laser module

  Shigeru Kanazawa;Hiroshi Yamazaki;Yasuhiko Nakanishi;Takeshi Fujisawa

  103
  Citations

• Theoretical investigation of ultrasmall polarization-insensitive 1/spl times/2 multimode interference waveguides based on sandwiched structures

  T. Fujisawa;M. Koshiba

  90
  Citations

• 2.33- $\mu$ m-Wavelength Distributed Feedback Lasers With InAs–In $_{0.53}$ Ga $_{0.47}$ As Multiple-Quantum Wells on InP Substrates

  T. Sato;M. Mitsuhara;N. Nunoya;T. Fujisawa

  80
  Citations

• Low-loss, compact, and fabrication-tolerant Si-wire 90° waveguide bend using clothoid and normal curves for large scale photonic integrated circuits

  Takeshi Fujisawa;Shuntaro Makino;Takanori Sato;Kunimasa Saitoh

  80
  Citations

• 1.3- $\mu$ m 4 $\, imes\,$ 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet

  T Fujisawa;S Kanazawa;H Ishii;N Nunoya

  75
  Citations

• Time-domain beam propagation method for nonlinear optical propagation analysis and its application to photonic Crystal circuits

  T. Fujisawa;M. Koshiba

  69
  Citations

• 25 Gbit/s 1.3 μm InGaAlAs-based electroabsorption modulator integrated with DFB laser for metro-area (40 km) 100 Gbit/s Ethernet system

  T. Fujisawa;M. Arai;N. Fujiwara;W. Kobayashi

  65
  Citations

• 13-μm, 4 × 25-Gbit/s, EADFB laser array module with large-output-power and low-driving-voltage for energy-efficient 100GbE transmitter

  Unknown

  65
  Citations

• Guided modes of nonlinear slot waveguides

  T. Fujisawa;M. Koshiba

  62
  Citations

• A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver

  S. Kanazawa;T. Fujisawa;A. Ohki;H. Ishii

  60
  Citations

• PLC-based mode multi/demultiplexers for mode division multiplexing

  Kunimasa Saitoh;Nobutomo Hanzawa;Taiji Sakamoto;Takeshi Fujisawa

  58
  Citations

• Design and analysis of a broadband dispersion compensating photonic crystal fiber Raman amplifier operating in S-band

  Shailendra K. Varshney;Takeshi Fujisawa;Kunimasa Saitoh;Masanori Koshiba

  57
  Citations

• Numerical investigation and optimization of a photonic crystal fiber for simultaneous dispersion compensation over S + C + L wavelength bands

  S.K. Varshney;N.J. Florous;K. Saitoh;M. Koshiba

  55
  Citations

• Novel design of inherently gain-flattened discrete highly nonlinear photonic crystal fiber Raman amplifier and dispersion compensation using a single pump in C-band.

  Shailendra K. Varshney;Takeshi Fujisawa;Kunimasa Saitoh;Masanori Koshiba

  52
  Citations

• Finite-element modeling of nonlinear Mach-Zehnder interferometers based on photonic-crystal waveguides for all-optical signal processing

  T. Fujisawa;M. Koshiba

  51
  Citations