E. Ciaramella, A. D'Errico, V. Donzella, "Using semiconductor optical-amplifiers with constant
envelope WDM signals," IEEE J. Quantum Electron. 44, 403-409 (2008).

I. Fatadin, D. Ives, M. Wicks, "Numerical simulation of intensity and phase noise from
extracted parameters for cw dfb lasers," IEEE J. Quantum Electron. 42, 934-941 (2006).

G. Berrettini, A. Simi, A. Malacarne, A. Bogoni, L. Potì, "Ultrafast integrable and reconfigurable XNOR, AND,
NOR, and NOT photonic logic gate," IEEE Photon. Technol. Lett. 18, 917-919 (2006).

A. Matsumoto, K. Nishimura, K. Utaka, M. Usami, "Operational design on high-speed semiconductor optical
amplifier with assist light for application to wavelength converters
using cross-phase modulation," IEEE J. Quantum Electron. 42, 313-323 (2006).

G. Contestabile, N. Calabretta, M. Presi, E. Ciaramella, "Single and multicast wavelength conversion at 40 gb/s
by means of fast nonlinear polarization switching in an SOA," IEEE Photon. Technol. Lett. 17, 2652-2654 (2005).

H. Simos, A. Bogris, D. Syvridis, "Investigation of a 2R all-optical regenerator based on
four-wave mixing in a semiconductor optical amplifier," J. Lightw. Technol. 22, 595-604 (2004).

G. Bosco, P. Poggiolini, "On the $Q$-factor inaccuracy in the performance analysis of optical
direct-detection dpsk systems," IEEE Photon. Technol. Lett. 16, 665-667 (2004).

C. Schubert, S. Diez, J. Berger, R. Ludwig, U. Feiste, H. G. Weber, G. Toptchiyski, K. Petermann, V. Krajinovic, "160-gb/s all-optical demultiplexing using a
gain-transparent ultrafast-nonlinear interferometer (GT-UNI)," IEEE Photon. Technol. Lett. 13, 475-477 (2001).

A. Reale, S. D. Carlo, P. Lugli, "Gain dynamics in traveling-wave optical amplifiers," IEEE J. Sel. Topics Quantum Electron. 7, 293-299 (2001).

A. Reale, S. D. Carlo, P. Lugli, D. Campi, C. Cacciatore, A. Stano, G. Fornuto, "Study of gain compression mechanisms in
multiple-quantum-well In$_{1-x}$Ga$_x$As semiconductor optical amplifiers," IEEE J. Quantum Electron. 35, 1697-1703 (1999).

S. Balle, "Simple analytical approximations for the gain and
refractive index spectra in quantum-well lasers," Phys. Rev. A 57, 1304-1312 (1998).

C. Ning, R. Indik, J. Moloney, "Effective bloch equations for semiconductor lasers and
amplifiers," IEEE J. Quantum Electron. 33, 1543-1550 (1997).

F. Matera, M. Settembre, "Comparison of the performance of optically amplified
transmission systems," IEEE J. Lightw. Technol. 14, 1-12 (1996).

A. Mecozzi, "Limits to long-haul coherent transmission set by the
kerr nonlinearity and noise of the in-line amplifiers," IEEE J. Lightw. Technol. 12, 1993-2000 (1994).

A. Uskov, J. Mörk, J. Mark, "Wave mixing in semiconductor laser amplifiers due to
carrier heating and spectral-hole burning," IEEE J. Quantum Electron. 30, 1769-1781 (1994).

N. S. Bergano, F. Kerfoot, C. Davidson, "Margin measurements in optical amplifier systems," IEEE Photon. Technol. Lett. 5, 304-306 (1993).

N. Storkfelt, B. Mikkelsen, D. Olesen, M. Yamaguchi, K. Stubkjaer, "Measurement of carrier lifetime and linewidth
enhancement factor for 1.5 $\mu$m ridge waveguide laser amplifier," IEEE Photon. Technol. Lett. 3, 632-634 (1991).

D. Hjelme, A. Mickelson, "Gain nonlinearities due to carrier density dependent
dispersion in semiconductor lasers," IEEE J. Quantum Electron. 25, 1625-1631 (1989).

B. Thedrez, A. Jones, R. Frey, "Two-level description of gain and mixing
susceptibility in amplifying semiconductor materials," IEEE J. Quantum Electron. 24, 1499-1506 (1988).

G. Agrawal, "Gain nonlinearities in semiconductor lasers: Theory
and application to distributed feedback lasers," IEEE J. Quantum Electron. QE-23, 860-868 (1987).

M. Asada, A. Kameyama, Y. Suematsu, "Gain and intervalence band absorption in quantum-well
lasers," IEEE J. Quantum Electron. QE-20, 745-753 (1984).

R. Kazarinov, C. Henry, R. Logan, "Longitudinal mode self-stabilization in semiconductor
lasers," J. Appl. Phys. 53, 4631-4644 (1982).

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semiconductor with parabolic bands," Appl. Phys. Lett. 33, 653-654 (1978).

N. Nilsson, "Empirical approximation for the fermi energy of a
semiconductor with parabolic bands," Appl. Phys. Lett. 33, 653-654 (1978).

F. Matera, M. Settembre, "Comparison of the performance of optically amplified
transmission systems," IEEE J. Lightw. Technol. 14, 1-12 (1996).

A. Mecozzi, "Limits to long-haul coherent transmission set by the
kerr nonlinearity and noise of the in-line amplifiers," IEEE J. Lightw. Technol. 12, 1993-2000 (1994).

A. Matsumoto, K. Nishimura, K. Utaka, M. Usami, "Operational design on high-speed semiconductor optical
amplifier with assist light for application to wavelength converters
using cross-phase modulation," IEEE J. Quantum Electron. 42, 313-323 (2006).

C. Ning, R. Indik, J. Moloney, "Effective bloch equations for semiconductor lasers and
amplifiers," IEEE J. Quantum Electron. 33, 1543-1550 (1997).

A. Reale, S. D. Carlo, P. Lugli, D. Campi, C. Cacciatore, A. Stano, G. Fornuto, "Study of gain compression mechanisms in
multiple-quantum-well In$_{1-x}$Ga$_x$As semiconductor optical amplifiers," IEEE J. Quantum Electron. 35, 1697-1703 (1999).

E. Ciaramella, A. D'Errico, V. Donzella, "Using semiconductor optical-amplifiers with constant
envelope WDM signals," IEEE J. Quantum Electron. 44, 403-409 (2008).

I. Fatadin, D. Ives, M. Wicks, "Numerical simulation of intensity and phase noise from
extracted parameters for cw dfb lasers," IEEE J. Quantum Electron. 42, 934-941 (2006).

B. Thedrez, A. Jones, R. Frey, "Two-level description of gain and mixing
susceptibility in amplifying semiconductor materials," IEEE J. Quantum Electron. 24, 1499-1506 (1988).

D. Hjelme, A. Mickelson, "Gain nonlinearities due to carrier density dependent
dispersion in semiconductor lasers," IEEE J. Quantum Electron. 25, 1625-1631 (1989).

G. Agrawal, "Gain nonlinearities in semiconductor lasers: Theory
and application to distributed feedback lasers," IEEE J. Quantum Electron. QE-23, 860-868 (1987).

M. Asada, A. Kameyama, Y. Suematsu, "Gain and intervalence band absorption in quantum-well
lasers," IEEE J. Quantum Electron. QE-20, 745-753 (1984).

A. Uskov, J. Mörk, J. Mark, "Wave mixing in semiconductor laser amplifiers due to
carrier heating and spectral-hole burning," IEEE J. Quantum Electron. 30, 1769-1781 (1994).

A. Reale, S. D. Carlo, P. Lugli, "Gain dynamics in traveling-wave optical amplifiers," IEEE J. Sel. Topics Quantum Electron. 7, 293-299 (2001).

N. Storkfelt, B. Mikkelsen, D. Olesen, M. Yamaguchi, K. Stubkjaer, "Measurement of carrier lifetime and linewidth
enhancement factor for 1.5 $\mu$m ridge waveguide laser amplifier," IEEE Photon. Technol. Lett. 3, 632-634 (1991).

N. S. Bergano, F. Kerfoot, C. Davidson, "Margin measurements in optical amplifier systems," IEEE Photon. Technol. Lett. 5, 304-306 (1993).

G. Bosco, P. Poggiolini, "On the $Q$-factor inaccuracy in the performance analysis of optical
direct-detection dpsk systems," IEEE Photon. Technol. Lett. 16, 665-667 (2004).

G. Contestabile, N. Calabretta, M. Presi, E. Ciaramella, "Single and multicast wavelength conversion at 40 gb/s
by means of fast nonlinear polarization switching in an SOA," IEEE Photon. Technol. Lett. 17, 2652-2654 (2005).

G. Berrettini, A. Simi, A. Malacarne, A. Bogoni, L. Potì, "Ultrafast integrable and reconfigurable XNOR, AND,
NOR, and NOT photonic logic gate," IEEE Photon. Technol. Lett. 18, 917-919 (2006).

C. Schubert, S. Diez, J. Berger, R. Ludwig, U. Feiste, H. G. Weber, G. Toptchiyski, K. Petermann, V. Krajinovic, "160-gb/s all-optical demultiplexing using a
gain-transparent ultrafast-nonlinear interferometer (GT-UNI)," IEEE Photon. Technol. Lett. 13, 475-477 (2001).

R. Kazarinov, C. Henry, R. Logan, "Longitudinal mode self-stabilization in semiconductor
lasers," J. Appl. Phys. 53, 4631-4644 (1982).

H. Simos, A. Bogris, D. Syvridis, "Investigation of a 2R all-optical regenerator based on
four-wave mixing in a semiconductor optical amplifier," J. Lightw. Technol. 22, 595-604 (2004).

S. Balle, "Simple analytical approximations for the gain and
refractive index spectra in quantum-well lasers," Phys. Rev. A 57, 1304-1312 (1998).

J. Revuelta, L. Pesquera, S. Balle, "Wavelength-dependent output properties of quantum well
optical amplifiers," Proc. Conf. Laser Electro-Opt. (2000) pp. 420-421.

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M. Connelly, Semiconductor Optical Amplifiers (Kluwer, 2002).

K.-P. Ho, Phase-Modulated Optical Communication Systems (Springer Science+Business Media, Inc., 2005).