Abstract

The mode coherence of adjacent and non-adjacent spectral modes of a passively mode locked quantum dash (QDash) semiconductor laser are deduced through radio frequency beat-tone linewidth measurements. A wavelength conversion scheme that uses degenerate four wave mixing in a semiconductor optical amplifier is proposed which considerably extends the mode spacing beyond the limit imposed by conventional fast-photodetection and electrical spectrum analysis of around 100 GHz. Using this scheme, the mode coherence of the QDash laser was measured out to the thirty-first harmonic, or a mode separation of 1.5 THz.

© 2012 Optical Society of America

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  1. X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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2011 (4)

2010 (1)

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

2009 (2)

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

T. Habruseva, S. O’Donoghue, N. Rebrova, F. Kéfélian, S. P. Hegarty, and G. Huyet, Opt. Lett. 34, 3307 (2009).
[CrossRef]

2007 (1)

2001 (1)

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

1998 (1)

K. Imai, M. Kourogi, and M. Ohtsu, IEEE J. Quantum Electron. 34, 011108 (1998).

1986 (1)

L. Richter, H. Mandelberg, M. Kruger, and P. McGrath, IEEE J. Quantum Electron. 22, 2070 (1986).
[CrossRef]

Accard, A.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Akalin, T.

G. Ducournau, P. Szriftgiser, T. Akalin, A. Beck, D. Bacquet, E. Peytavit, and J. F. Lampin, Opt. Lett. 36, 2044 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Akrout, A.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Bacquet, D.

Barry, L. P.

Beck, A.

G. Ducournau, P. Szriftgiser, T. Akalin, A. Beck, D. Bacquet, E. Peytavit, and J. F. Lampin, Opt. Lett. 36, 2044 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Bull, J. D.

Chandrasekhar, S.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Chen, X.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Dimarcello, F. V.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Ducournau, G.

G. Ducournau, P. Szriftgiser, T. Akalin, A. Beck, D. Bacquet, E. Peytavit, and J. F. Lampin, Opt. Lett. 36, 2044 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Eggleton, B. J.

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Ellis, A. D.

Fini, J. M.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Fishteyn, M.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Garcia Gunning, F. C.

Habruseva, T.

Healy, T.

Hegarty, S. P.

Huyet, G.

Imai, K.

K. Imai, M. Kourogi, and M. Ohtsu, IEEE J. Quantum Electron. 34, 011108 (1998).

Kéfélian, F.

Kourogi, M.

K. Imai, M. Kourogi, and M. Ohtsu, IEEE J. Quantum Electron. 34, 011108 (1998).

Kruger, M.

L. Richter, H. Mandelberg, M. Kruger, and P. McGrath, IEEE J. Quantum Electron. 22, 2070 (1986).
[CrossRef]

Lamont, M. R. E.

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Lampin, J. F.

G. Ducournau, P. Szriftgiser, T. Akalin, A. Beck, D. Bacquet, E. Peytavit, and J. F. Lampin, Opt. Lett. 36, 2044 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Landais, P.

S. G. Murdoch, R. T. Watts, Y. Q. Xu, R. Maldonado-Basilio, J. Parra-Cetina, S. Latkowski, P. Landais, and L. P. Barry, Opt. Express 19, 13628 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Latkowski, S.

S. G. Murdoch, R. T. Watts, Y. Q. Xu, R. Maldonado-Basilio, J. Parra-Cetina, S. Latkowski, P. Landais, and L. P. Barry, Opt. Express 19, 13628 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Lelarge, F.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Lester, L. F.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

Li, H.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

Li, J.

Liu, X.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Luan, F.

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Madden, S. J.

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Maldonado-Basilio, R.

S. G. Murdoch, R. T. Watts, Y. Q. Xu, R. Maldonado-Basilio, J. Parra-Cetina, S. Latkowski, P. Landais, and L. P. Barry, Opt. Express 19, 13628 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Malloy, K. J.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

Mandelberg, H.

L. Richter, H. Mandelberg, M. Kruger, and P. McGrath, IEEE J. Quantum Electron. 22, 2070 (1986).
[CrossRef]

Martinez, A.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

McGrath, P.

L. Richter, H. Mandelberg, M. Kruger, and P. McGrath, IEEE J. Quantum Electron. 22, 2070 (1986).
[CrossRef]

Merghem, K.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Monberg, E. M.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Murdoch, S. G.

Newell, T. C.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

O’Donoghue, S.

Ohtsu, M.

K. Imai, M. Kourogi, and M. Ohtsu, IEEE J. Quantum Electron. 34, 011108 (1998).

Pan, Y.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Parra-Cetina, J.

S. G. Murdoch, R. T. Watts, Y. Q. Xu, R. Maldonado-Basilio, J. Parra-Cetina, S. Latkowski, P. Landais, and L. P. Barry, Opt. Express 19, 13628 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Pelusi, M.

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Peytavit, E.

G. Ducournau, P. Szriftgiser, T. Akalin, A. Beck, D. Bacquet, E. Peytavit, and J. F. Lampin, Opt. Lett. 36, 2044 (2011).
[CrossRef]

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

Ramdane, A.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Rebrova, N.

Richter, L.

L. Richter, H. Mandelberg, M. Kruger, and P. McGrath, IEEE J. Quantum Electron. 22, 2070 (1986).
[CrossRef]

Rosales, R.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Stintz, A.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

Szriftgiser, P.

Taunay, T. F.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Tian, F.

Tourrenc, J.-P.

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

Varangis, P. M.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

Vo, T. D.

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Wang, R. H.

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

Watts, R. T.

Winzer, P. J.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Xi, L.

Xu, Y. Q.

Yan, M. F.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Zhang, X.

Zhu, B.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

Appl. Phys. Lett. (1)

S. Latkowski, J. Parra-Cetina, R. Maldonado-Basilio, P. Landais, G. Ducournau, A. Beck, E. Peytavit, T. Akalin, and J. F. Lampin, Appl. Phys. Lett. 96, 241106 (2010).
[CrossRef]

IEEE J. Quantum Electron. (2)

K. Imai, M. Kourogi, and M. Ohtsu, IEEE J. Quantum Electron. 34, 011108 (1998).

L. Richter, H. Mandelberg, M. Kruger, and P. McGrath, IEEE J. Quantum Electron. 22, 2070 (1986).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

R. Rosales, K. Merghem, A. Martinez, A. Akrout, J.-P. Tourrenc, A. Accard, F. Lelarge, and A. Ramdane, IEEE J. Sel. Top. Quantum Electron. 17, 1292 (2011).
[CrossRef]

IEEE Photonics Technol. Lett. (1)

R. H. Wang, A. Stintz, P. M. Varangis, T. C. Newell, H. Li, K. J. Malloy, and L. F. Lester, IEEE Photonics Technol. Lett. 13, 081101 (2001).
[CrossRef]

J. Lightwave Technol. (1)

Nat. Photonics (1)

M. Pelusi, F. Luan, T. D. Vo, M. R. E. Lamont, S. J. Madden, and B. J. Eggleton, Nat. Photonics 3, 139 (2009).
[CrossRef]

Opt. Express (2)

Opt. Lett. (2)

Other (1)

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T. F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12 Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in ECOC Postdeadline Papers 2011: Proceedings of the 37th European Conference and Exhibition on Optical Communication, Geneva, Switzerland ( September 18–22, 2011), pp. 1–3.

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Figures (4)

Fig. 1.
Fig. 1.

(a) Optical spectrum of passively mode-locked QDash laser and (b) optical linewidths of the individual spectral modes as measured using the delayed self-heterodyne technique. Solid red line shows a quadratic fit to the measured optical linewidths.

Fig. 2.
Fig. 2.

Experimental setup used to measure the RF linewidth of non-adjacent spectral modes using FWM in a nonlinear SOA and real-time detection.

Fig. 3.
Fig. 3.

(a) Dual degenerate FWM mixing scheme employed to achieve correct phase conjugation and (b) RF beat-tone linewidth measured for two ECLs and two adjacent spectral modes using the FWM technique (320 kHz). Dashed red line shows a nonlinearly regressed Lorentzian fit.

Fig. 4.
Fig. 4.

(a) Measured RF beat-tone linewidth (red circles) for two spectral modes (solid red line shows a quadratic fit) and the sum of the optical linewidths of the two spectral modes (blue squares), and (b) ratio of the sum of the optical linewidths and the RF linewidth (blue circles) as a function of increasing spectral mode separation. Dashed red line depicts a unity ratio for noncoherent spectral modes.

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