Abstract

We developed an InP-based 4x1 transversal filter (TF) with multi-mode interference couplers (MMIs) as a compact wavelength multiplexer (MUX) 1700 μm x 400 μm in size. Furthermore, we converted the MMI-based TF to a reflection type to obtain an ultra-compact MUX of only 900 μm x 50 μm. These MUXs are made with a simple fabrication process and show a satisfactory wavelength filtering operation as MUXs of monolithically integrated light source arrays, for example, for 100G bit Ethernet.

© 2014 Optical Society of America

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  1. T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
    [CrossRef]
  2. S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
    [CrossRef]
  3. T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
    [CrossRef] [PubMed]
  4. T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
    [CrossRef]
  5. H. Ishii, K. Kasaya, H. Oohashi, “Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array,” IEEE J. Sel. Top. Quantum Electron. 15(3), 514–520 (2009).
    [CrossRef]
  6. Y. Hibino, “Recent Advances in High-Density and Large-Scale AWG Multi/Demultiplexers with Higher Index-Contrast Silica-Based PLCs,” IEEE J. Sel. Top. Quantum Electron. 8(6), 1090–1101 (2002).
    [CrossRef]
  7. Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
    [CrossRef]
  8. K. Takiguchi, T. Kitoh, M. Oguma, Y. Hashizume, and H. Takahashi, “Integrated-optic OFDM Demultiplexer using Multi-mode Interference Coupler-based Optical DFT Circuit,” in Proc. OFC 2012 OM3J.6 (2012).
    [CrossRef]
  9. T. Goh, S. Suzuki, A. Sugita, “Estimation of Waveguide Phase Error in Silica-Based Waveguides,” J. Lightwave Technol. 15(11), 2107–2113 (1997).
    [CrossRef]
  10. T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
    [CrossRef]

2013 (1)

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

2012 (1)

2011 (3)

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

2009 (1)

H. Ishii, K. Kasaya, H. Oohashi, “Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array,” IEEE J. Sel. Top. Quantum Electron. 15(3), 514–520 (2009).
[CrossRef]

2004 (1)

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

2002 (1)

Y. Hibino, “Recent Advances in High-Density and Large-Scale AWG Multi/Demultiplexers with Higher Index-Contrast Silica-Based PLCs,” IEEE J. Sel. Top. Quantum Electron. 8(6), 1090–1101 (2002).
[CrossRef]

1997 (1)

T. Goh, S. Suzuki, A. Sugita, “Estimation of Waveguide Phase Error in Silica-Based Waveguides,” J. Lightwave Technol. 15(11), 2107–2113 (1997).
[CrossRef]

Barbarin, Y.

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

Bente, E. A. J. M.

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

Fujisawa, T.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
[CrossRef] [PubMed]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

Fujiwara, N.

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

Goh, T.

T. Goh, S. Suzuki, A. Sugita, “Estimation of Waveguide Phase Error in Silica-Based Waveguides,” J. Lightwave Technol. 15(11), 2107–2113 (1997).
[CrossRef]

Hibino, Y.

Y. Hibino, “Recent Advances in High-Density and Large-Scale AWG Multi/Demultiplexers with Higher Index-Contrast Silica-Based PLCs,” IEEE J. Sel. Top. Quantum Electron. 8(6), 1090–1101 (2002).
[CrossRef]

Iga, R.

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

Ishii, H.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
[CrossRef] [PubMed]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

H. Ishii, K. Kasaya, H. Oohashi, “Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array,” IEEE J. Sel. Top. Quantum Electron. 15(3), 514–520 (2009).
[CrossRef]

Ito, T.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

Kakitsuka, T.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Kanazawa, S.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
[CrossRef] [PubMed]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

Kano, F.

T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
[CrossRef] [PubMed]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

Kasaya, K.

H. Ishii, K. Kasaya, H. Oohashi, “Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array,” IEEE J. Sel. Top. Quantum Electron. 15(3), 514–520 (2009).
[CrossRef]

Kawaguchi, Y.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

Kobayashi, W.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
[CrossRef] [PubMed]

Kohtoku, M.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

Kondo, Y.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Kooiman, J. R.

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

Leijtens, X. J. M.

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

Louzao, C. M.

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

Matsuo, S.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Nunoya, N.

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

Ohki, A.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

Oohashi, H.

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

H. Ishii, K. Kasaya, H. Oohashi, “Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array,” IEEE J. Sel. Top. Quantum Electron. 15(3), 514–520 (2009).
[CrossRef]

Sato, T.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Segawa, T.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Shibata, Y.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Smit, M. K.

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

Sugita, A.

T. Goh, S. Suzuki, A. Sugita, “Estimation of Waveguide Phase Error in Silica-Based Waveguides,” J. Lightwave Technol. 15(11), 2107–2113 (1997).
[CrossRef]

Suzuki, S.

T. Goh, S. Suzuki, A. Sugita, “Estimation of Waveguide Phase Error in Silica-Based Waveguides,” J. Lightwave Technol. 15(11), 2107–2113 (1997).
[CrossRef]

Tadokoro, T.

Takahashi, R.

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

Takahata, K.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

T. Fujisawa, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, F. Kano, “1.3-μm, 4 × 25-Gbit/s, EADFB Laser Array Module with Large-output-power and Low-driving-voltage for Energy-efficient 100GbE Transmitter,” Opt. Express 20(1), 614–620 (2012).
[CrossRef] [PubMed]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

Ueda, Y.

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

IEEE J. Quantum Electron. (1)

T. Fujisawa, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Ito, M. Kohtoku, H. Ishii, “Low-Loss Cascaded Mach–Zehnder Multiplexer Integrated 25-Gbit/s x 4-Lane EADFB Laser Array for Future CFP4 100 GbE Transmitter,” IEEE J. Quantum Electron. 49, 1001–1007 (2013).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (3)

H. Ishii, K. Kasaya, H. Oohashi, “Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array,” IEEE J. Sel. Top. Quantum Electron. 15(3), 514–520 (2009).
[CrossRef]

Y. Hibino, “Recent Advances in High-Density and Large-Scale AWG Multi/Demultiplexers with Higher Index-Contrast Silica-Based PLCs,” IEEE J. Sel. Top. Quantum Electron. 8(6), 1090–1101 (2002).
[CrossRef]

S. Kanazawa, T. Fujisawa, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “A Compact EADFB Laser Array Module for a Future 100-Gb/s Ethernet Transceiver,” IEEE J. Sel. Top. Quantum Electron. 17(5), 1191–1197 (2011).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

T. Fujisawa, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, H. Oohashi, “1.3-μm 4 x 25-Gb/s Monolithically Integrated Light Source for Metro Area 100-Gb/s Ethernet,” IEEE Photon. Technol. Lett. 23(6), 356–358 (2011).
[CrossRef]

Y. Barbarin, X. J. M. Leijtens, E. A. J. M. Bente, C. M. Louzao, J. R. Kooiman, M. K. Smit, “Extremely Small AWG Demultiplexer Fabricated on InP by using a Double-Etch Process,” IEEE Photon. Technol. Lett. 16(11), 2478–2480 (2004).
[CrossRef]

IEICE Trans. Electron. (1)

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, R. Takahashi, “Monolithically Integrated Wavelength-Routing Switch using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers,” IEICE Trans. Electron. E94-C(9), 1439–1446 (2011).
[CrossRef]

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T. Goh, S. Suzuki, A. Sugita, “Estimation of Waveguide Phase Error in Silica-Based Waveguides,” J. Lightwave Technol. 15(11), 2107–2113 (1997).
[CrossRef]

Opt. Express (1)

Other (1)

K. Takiguchi, T. Kitoh, M. Oguma, Y. Hashizume, and H. Takahashi, “Integrated-optic OFDM Demultiplexer using Multi-mode Interference Coupler-based Optical DFT Circuit,” in Proc. OFC 2012 OM3J.6 (2012).
[CrossRef]

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Figures (7)

Fig. 1
Fig. 1

MMI-TF and its components (a) left: 4x4 DFT circuit of an I/O-interchanged MMI with phase shifters, center: four delay lines whose lengths change in steps of ΔL, right: 1x4 splitter by a 1x4 MMI with phase shifters (b) schematic structure of a 4x1 MMI-TF.

Fig. 2
Fig. 2

Calculated transmittance of an MMI-TF.

Fig. 3
Fig. 3

(a) Photograph of a fabricated 4x1 MMI TF (b) experimental transmittance.

Fig. 4
Fig. 4

(a) 5x1 MMI-TF using two 5x5 MMIs (b) 4x1 RTF using one 5x5 MMI.

Fig. 5
Fig. 5

Photograph of a fabricated RTF.

Fig. 6
Fig. 6

Transmittance of a 4x1 RTF (a) designed (b) experiment.

Fig. 7
Fig. 7

Schematic structure of an RTF-integrated LD array.

Equations (6)

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[ X( f 0 ) X( f 0 +Δf) X( f 0 +2Δf) X( f 0 +3Δf) ]= 1 4 [ 1 1 1 1 1 j 1 j 1 1 1 1 1 j 1 j ][ x( t 0 ) x( t 0 +Δt) x( t 0 +2Δt) x( t 0 +3Δt) ].
T 1x4 splitter = 1 4 [ 1 1 1 1 ] t = diag[ e jπ/2 1 1 e jπ/2 ] T 1x4 MMI .
T 4delay =diag [ 1 e jβΔL e jβ(2ΔL) e jβ(3ΔL) ].
T 4x4MMI = aexp( jπ /4 ) 1 4 [ a 1 1 a 1 a a 1 1 a a 1 a 1 1 a ] row: 4,2,1,3 1 4 [ a 1 1 a 1 a a 1 a 1 1 a 1 a a 1 ] column: 1,2,4,3 1 4 [ a 1 a 1 1 a 1 a a 1 a 1 1 a 1 a ] T ˜ 4x4MMI
diag[ e jπ e j π 4 e jπ e j 3π 4 ] T ˜ 4x4MMI diag[ e j 3π 4 e jπ e j 3π 4 1 ]= T 4x4DFT
rank[ d ij / b ij ]=1.

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