W. Kobayashi, M. Arai, T. Yamanaka, N. Fujiwara, T. Fujisawa, T. Tadokoro, K. Tsuzuki, Y. Kondo, F. Kano, "Design and fabrication of 10-/40-Gb/s, uncooled
electroabsorption modulator integrated DFB laser with butt-joint
structure," J. Lightw. Technol. 28, 164-171 (2010).

N. Nunoya, H. Ishii, Y. Kawaguchi, Y. Kondo, H. Oohashi, "Wideband tuning of tunable distributed amplification
distributed feedback laser array," Electron. Lett. 44, 205-206 (2008).

H. Ishii, K. Kasaya, H. Oohashi, H. Shibata, H. Yasaka, K. Okamoto, "Widely wavelength-tunable DFB laser array integrated
with funnel combiner," IEEE J. Sel. Topics Quantum Electron. 13, 1089-1094 (2007).

T. Segawa, S. Matsuo, T. Kakitsuka, T. Sato, Y. Kondo, H. Suzuki, "Full $C$-band tuning operation of semiconductor double-ring
resonator coupled laser with low tuning current," IEEE Photon. Technol. Lett. 19, 1322-1324 (2007).

W. Choi, N. Frateschi, J. Zhang, H. Gebretsadik, R. Jambunathan, A. E. Bond, J. V. Norman, D. Vandegrift, C. Wanamaker, "Full $C$-band tunable high fibre output power electroabsorption
modulator integrated with semiconductor optical amplifier," Electron. Lett. 39, 1271-1272 (2003).

N. Fujiwara, T. Kakitsuka, M. Ishikawa, F. Kano, H. Okamoto, Y. Kawaguchi, Y. Kondo, Y. Yoshikuni, Y. Tohmori, "Inherently mode-hop-free distributed Bragg reflector
(DBR) laser array," IEEE J. Sel. Topics Quantum Electron. 9, 1132-1137 (2003).

J. Shimizu, M. Aoki, T. Tsuchiya, M. Shirai, A. Taike, T. Ohtoshi, S. Tsuji, "Advantages of optical modulators with
InGaAlAs/InGaAlAs MQW structure," Electron. Lett. 38, 821-822 (2002).

M. Matsuda, K. Morito, K. Yamaji, T. Fujii, Y. Kotaki, "Novel method for designing chirp characteristics in
electroabsorption MQW optical modulator," IEEE Photon. Technol. Lett. 10, 364-366 (1998).

H. Ishii, H. Tanobe, F. Kano, Y. Tohmori, Y. Kondo, Y. Yoshikuni, "Quasicontinuous wavelength tuning in
super-structure-grating (SSG) DBR lasers," J. Quantum Electron. 32, 433-441 (1996).

T. Yamanaka, K. Wakita, K. Yokoyama, "Potential chirp-free characteristics (negative chirp
parameter) in electroabsorption modulation using a wide
tensile-strained quantum well structure," Appl. Phys. Lett. 68, 3114-3116 (1996).

T. Ido, H. Sano, S. Tanaka, H. Inoue, "Frequency-domain measurement of carrier escape time in
MQW electro-absorption optical modulator," IEEE Photon. Technol. Lett. 7, 1421-1423 (1995).

T. Ishikawa, J. E. Bowers, "Band lineup and in-plane effective mass of InGaAsP or
InGaAlAs on InP strained-layer quantum well," J. Quantum Electron. 30, 562-570 (1994).

F. Devaux, Y. Sorel, J. F. Kerdiles, "Simple measurement of fiber dispersion and of chirp
parameter of intensity modulated light emitter," J. Lightw. Technol. 11, 1937-1940 (1993).

G. Bastard, E. E. Mendez, L. L. Chang, L. Esaki, "Variational calculation on a quantum well in an
electric field," Phys. Rev. B 28, 3241 (1983).

T. Yamanaka, K. Wakita, K. Yokoyama, "Potential chirp-free characteristics (negative chirp
parameter) in electroabsorption modulation using a wide
tensile-strained quantum well structure," Appl. Phys. Lett. 68, 3114-3116 (1996).

J. Shimizu, M. Aoki, T. Tsuchiya, M. Shirai, A. Taike, T. Ohtoshi, S. Tsuji, "Advantages of optical modulators with
InGaAlAs/InGaAlAs MQW structure," Electron. Lett. 38, 821-822 (2002).

N. Nunoya, H. Ishii, Y. Kawaguchi, Y. Kondo, H. Oohashi, "Wideband tuning of tunable distributed amplification
distributed feedback laser array," Electron. Lett. 44, 205-206 (2008).

W. Choi, N. Frateschi, J. Zhang, H. Gebretsadik, R. Jambunathan, A. E. Bond, J. V. Norman, D. Vandegrift, C. Wanamaker, "Full $C$-band tunable high fibre output power electroabsorption
modulator integrated with semiconductor optical amplifier," Electron. Lett. 39, 1271-1272 (2003).

H. Ishii, K. Kasaya, H. Oohashi, H. Shibata, H. Yasaka, K. Okamoto, "Widely wavelength-tunable DFB laser array integrated
with funnel combiner," IEEE J. Sel. Topics Quantum Electron. 13, 1089-1094 (2007).

N. Fujiwara, T. Kakitsuka, M. Ishikawa, F. Kano, H. Okamoto, Y. Kawaguchi, Y. Kondo, Y. Yoshikuni, Y. Tohmori, "Inherently mode-hop-free distributed Bragg reflector
(DBR) laser array," IEEE J. Sel. Topics Quantum Electron. 9, 1132-1137 (2003).

T. Ido, H. Sano, S. Tanaka, H. Inoue, "Frequency-domain measurement of carrier escape time in
MQW electro-absorption optical modulator," IEEE Photon. Technol. Lett. 7, 1421-1423 (1995).

T. Segawa, S. Matsuo, T. Kakitsuka, T. Sato, Y. Kondo, H. Suzuki, "Full $C$-band tuning operation of semiconductor double-ring
resonator coupled laser with low tuning current," IEEE Photon. Technol. Lett. 19, 1322-1324 (2007).

M. Matsuda, K. Morito, K. Yamaji, T. Fujii, Y. Kotaki, "Novel method for designing chirp characteristics in
electroabsorption MQW optical modulator," IEEE Photon. Technol. Lett. 10, 364-366 (1998).

W. Kobayashi, M. Arai, T. Yamanaka, N. Fujiwara, T. Fujisawa, T. Tadokoro, K. Tsuzuki, Y. Kondo, F. Kano, "Design and fabrication of 10-/40-Gb/s, uncooled
electroabsorption modulator integrated DFB laser with butt-joint
structure," J. Lightw. Technol. 28, 164-171 (2010).

F. Devaux, Y. Sorel, J. F. Kerdiles, "Simple measurement of fiber dispersion and of chirp
parameter of intensity modulated light emitter," J. Lightw. Technol. 11, 1937-1940 (1993).

T. Ishikawa, J. E. Bowers, "Band lineup and in-plane effective mass of InGaAsP or
InGaAlAs on InP strained-layer quantum well," J. Quantum Electron. 30, 562-570 (1994).

H. Ishii, H. Tanobe, F. Kano, Y. Tohmori, Y. Kondo, Y. Yoshikuni, "Quasicontinuous wavelength tuning in
super-structure-grating (SSG) DBR lasers," J. Quantum Electron. 32, 433-441 (1996).

G. Bastard, E. E. Mendez, L. L. Chang, L. Esaki, "Variational calculation on a quantum well in an
electric field," Phys. Rev. B 28, 3241 (1983).

ITUT. G. 959. 1, http://www.itu.int/rec/T-REC-G.959.1-200803-S.

H. Oohashi, Y. Shibata, H. Ishii, Y. Kawaguchi, Y. Kondo, Y. Yoshikuni, Y. Tohmori, "46.9-nm wavelength-selectable arrayed DFB lasers with
integrated MMI coupler and SOA," Proc. Indium Phosphide Relat. Mater. (IPRM 2001) pp. 575-578.