Abstract

We propose a pulse-tail elimination and pulse shortening method using an optical interferometer, which is effective for picosecond chirped pulses from gain-switched multimode laser diodes. In a numerical simulation, when the delay distance between a chirped pulse and its replica in an optical interferometer matches two times the round-trip optical length of the laser cavity, the pulse-front and -rear tail parts are effectively eliminated from the input chirped pulse after passing through the optical interferometer. Using this method with a fiber Sagnac interferometer, a 33 ps pulse with a long-tail emitted from a gain-switched 1540 nm multimode laser diode was linearly transformed into a 20 ps pulse with a substantially reduced tail.

© 2008 Optical Society of America

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  1. A. Aschwanden, D. Lorenser, H. J. Unold, R. Paschotta, E. Gini, and U. Keller, "2.1-W picosecond passively mode-locked external-cavity semiconductor laser," Opt. Lett. 30, 272-274 (2005).
    [CrossRef] [PubMed]
  2. A. Fragemann, V. Pasiskevicius, and F. Laurell, "Optical parametric amplification of a gain-switched picosecond laser diode," Opt. Express 13, 6482-6489 (2005), http://www.opticsinfobase.org/abstract.cfm?URI=oe-13-17-6482.
    [CrossRef] [PubMed]
  3. K. Taira, T. Hashimoto, and H. Yokoyama, "Two-photon fluorescence imaging with a pulse source based on a 980-nm gain-switched laser diode," Opt. Express 15, 2454-2458 (2007), http://www.opticsinfobase.org/abstract.cfm?URI=oe-15-5-2454.
    [CrossRef] [PubMed]
  4. H. Liu, C. Gao, J. Tao, W. Zhao, and Y. Wang, "Compact tunable high power picosecond source based on Yb-doped fiber amplification of gain switch laser diode," Opt. Express 16, 7888-7893 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-11-7888.
    [CrossRef] [PubMed]
  5. K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
    [CrossRef]
  6. K. Wada, H. Sato, H. Yoshioka, T. Matsuyama, and H. Horinaka, "Suppression of side fringes in low-coherence interferometric measurements using gain- or loss-modulated multimode laser diodes" Jpn. J. Appl. Phys. 44, 8484-8490 (2005).
    [CrossRef]
  7. K. Wada, Y. Akage, and Y. Cho, "α-parameter dependence of chirped pulse from injection-modulated semiconductor lasers," Opt. Rev. 1, 217-219 (1994).
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
  12. P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
  16. K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
    [CrossRef]
  17. K. L. Sala, G. A. Kenny-Wallace, and G. E. Hall, "CW autocorrelation measurements of picosecond laser pulses," IEEE J. Quantum Electron. QE-16, 990-996 (1980).
    [CrossRef]
  18. K. Wada and Y. Cho, "Improved expression for the time-bandwidth product of picosecond optical pulses from gain-switched semiconductor lasers," Opt. Lett. 19, 1633-1635 (1994).
    [CrossRef] [PubMed]

2008 (2)

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

H. Liu, C. Gao, J. Tao, W. Zhao, and Y. Wang, "Compact tunable high power picosecond source based on Yb-doped fiber amplification of gain switch laser diode," Opt. Express 16, 7888-7893 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-11-7888.
[CrossRef] [PubMed]

2007 (1)

2006 (1)

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

2005 (3)

1999 (1)

L. P. Barry, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, "Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5μm," Electron. Lett. 35, 1166-1168 (1999).
[CrossRef]

1998 (1)

1996 (1)

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

1994 (2)

K. Wada and Y. Cho, "Improved expression for the time-bandwidth product of picosecond optical pulses from gain-switched semiconductor lasers," Opt. Lett. 19, 1633-1635 (1994).
[CrossRef] [PubMed]

K. Wada, Y. Akage, and Y. Cho, "α-parameter dependence of chirped pulse from injection-modulated semiconductor lasers," Opt. Rev. 1, 217-219 (1994).

1990 (1)

1989 (1)

R. Takahashi, H. F. Liu, M. Osinski, and T. Kamiya, "Picosecond single-mode pulse compression using a 1.3 μm Fabry-Perot laser diode, a dispersion-shifted fiber, a grating monochromator," Appl. Phys. Lett. 55, 2377-2379 (1989).
[CrossRef]

1987 (1)

R. Olshansky, P. Hill, V. Lanzisera, and W. Powazinik, "Frequency response of 1.3 μm InGaAsP high speed semiconductor laser," IEEE J. Quantum Electron. QE-23, 1410-1418 (1987).
[CrossRef]

1985 (1)

A. Takada, T. Sugie, and M. Saruwatari, "Picosecond optical pulse compression from gain-switched 1.3 μm distributed-feedback laser diode through highly dispersive single-mode fiber," Electron. Lett. 21, 969-971 (1985).
[CrossRef]

1980 (1)

K. L. Sala, G. A. Kenny-Wallace, and G. E. Hall, "CW autocorrelation measurements of picosecond laser pulses," IEEE J. Quantum Electron. QE-16, 990-996 (1980).
[CrossRef]

Akage, Y.

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

K. Wada, Y. Akage, and Y. Cho, "α-parameter dependence of chirped pulse from injection-modulated semiconductor lasers," Opt. Rev. 1, 217-219 (1994).

Anandarajah, P. M.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

Aschwanden, A.

Barry, L. P.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

L. P. Barry, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, "Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5μm," Electron. Lett. 35, 1166-1168 (1999).
[CrossRef]

Bresson, A.

Cho, Y.

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

K. Wada and Y. Cho, "Improved expression for the time-bandwidth product of picosecond optical pulses from gain-switched semiconductor lasers," Opt. Lett. 19, 1633-1635 (1994).
[CrossRef] [PubMed]

K. Wada, Y. Akage, and Y. Cho, "α-parameter dependence of chirped pulse from injection-modulated semiconductor lasers," Opt. Rev. 1, 217-219 (1994).

Clarke, A.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

Dudley, J. M.

L. P. Barry, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, "Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5μm," Electron. Lett. 35, 1166-1168 (1999).
[CrossRef]

Edvell, G.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

Ekawa, M.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Fragemann, A.

Froehly, C.

Gao, C.

Gini, E.

Guignard, C.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

Hall, G. E.

K. L. Sala, G. A. Kenny-Wallace, and G. E. Hall, "CW autocorrelation measurements of picosecond laser pulses," IEEE J. Quantum Electron. QE-16, 990-996 (1980).
[CrossRef]

Harvey, J. D.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

L. P. Barry, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, "Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5μm," Electron. Lett. 35, 1166-1168 (1999).
[CrossRef]

Hashimoto, T.

Hill, P.

R. Olshansky, P. Hill, V. Lanzisera, and W. Powazinik, "Frequency response of 1.3 μm InGaAsP high speed semiconductor laser," IEEE J. Quantum Electron. QE-23, 1410-1418 (1987).
[CrossRef]

Horinaka, H.

K. Wada, H. Sato, H. Yoshioka, T. Matsuyama, and H. Horinaka, "Suppression of side fringes in low-coherence interferometric measurements using gain- or loss-modulated multimode laser diodes" Jpn. J. Appl. Phys. 44, 8484-8490 (2005).
[CrossRef]

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

Ide, S.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Kamiya, T.

R. Takahashi, H. F. Liu, M. Osinski, and T. Kamiya, "Picosecond single-mode pulse compression using a 1.3 μm Fabry-Perot laser diode, a dispersion-shifted fiber, a grating monochromator," Appl. Phys. Lett. 55, 2377-2379 (1989).
[CrossRef]

Keller, U.

Kenny-Wallace, G. A.

K. L. Sala, G. A. Kenny-Wallace, and G. E. Hall, "CW autocorrelation measurements of picosecond laser pulses," IEEE J. Quantum Electron. QE-16, 990-996 (1980).
[CrossRef]

Kimura, Y.

Lanzisera, V.

R. Olshansky, P. Hill, V. Lanzisera, and W. Powazinik, "Frequency response of 1.3 μm InGaAsP high speed semiconductor laser," IEEE J. Quantum Electron. QE-23, 1410-1418 (1987).
[CrossRef]

Laurell, F.

Liu, H.

Liu, H. F.

R. Takahashi, H. F. Liu, M. Osinski, and T. Kamiya, "Picosecond single-mode pulse compression using a 1.3 μm Fabry-Perot laser diode, a dispersion-shifted fiber, a grating monochromator," Appl. Phys. Lett. 55, 2377-2379 (1989).
[CrossRef]

Lorenser, D.

Lourtioz, J. M.

Marui, H.

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

Matsuda, M.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Matsuyama, T.

K. Wada, H. Sato, H. Yoshioka, T. Matsuyama, and H. Horinaka, "Suppression of side fringes in low-coherence interferometric measurements using gain- or loss-modulated multimode laser diodes" Jpn. J. Appl. Phys. 44, 8484-8490 (2005).
[CrossRef]

Mori, K.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Nakazawa, M.

Okumura, S.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Olshansky, R.

R. Olshansky, P. Hill, V. Lanzisera, and W. Powazinik, "Frequency response of 1.3 μm InGaAsP high speed semiconductor laser," IEEE J. Quantum Electron. QE-23, 1410-1418 (1987).
[CrossRef]

Osinski, M.

R. Takahashi, H. F. Liu, M. Osinski, and T. Kamiya, "Picosecond single-mode pulse compression using a 1.3 μm Fabry-Perot laser diode, a dispersion-shifted fiber, a grating monochromator," Appl. Phys. Lett. 55, 2377-2379 (1989).
[CrossRef]

Otsubo, K.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Paschotta, R.

Pasiskevicius, V.

Powazinik, W.

R. Olshansky, P. Hill, V. Lanzisera, and W. Powazinik, "Frequency response of 1.3 μm InGaAsP high speed semiconductor laser," IEEE J. Quantum Electron. QE-23, 1410-1418 (1987).
[CrossRef]

Reid, D.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

Rensing, M.

P. M. Anandarajah, C. Guignard, A. Clarke, D. Reid, M. Rensing, L. P. Barry, G. Edvell, and J. D. Harvey, "Optimised pulse source employing an externally injected gain-switched laser diode in conjunction with a nonlinearly chirped grating," IEEE J. Selected Topics in Quantum Electron. 12, 255-264 (2006).
[CrossRef]

Sala, K. L.

K. L. Sala, G. A. Kenny-Wallace, and G. E. Hall, "CW autocorrelation measurements of picosecond laser pulses," IEEE J. Quantum Electron. QE-16, 990-996 (1980).
[CrossRef]

Saruwatari, M.

A. Takada, T. Sugie, and M. Saruwatari, "Picosecond optical pulse compression from gain-switched 1.3 μm distributed-feedback laser diode through highly dispersive single-mode fiber," Electron. Lett. 21, 969-971 (1985).
[CrossRef]

Sato, H.

K. Wada, H. Sato, H. Yoshioka, T. Matsuyama, and H. Horinaka, "Suppression of side fringes in low-coherence interferometric measurements using gain- or loss-modulated multimode laser diodes" Jpn. J. Appl. Phys. 44, 8484-8490 (2005).
[CrossRef]

Shen, A.

Stelmakh, N.

Sugie, T.

A. Takada, T. Sugie, and M. Saruwatari, "Picosecond optical pulse compression from gain-switched 1.3 μm distributed-feedback laser diode through highly dispersive single-mode fiber," Electron. Lett. 21, 969-971 (1985).
[CrossRef]

Suzuki, K.

Taira, K.

Takada, A.

A. Takada, T. Sugie, and M. Saruwatari, "Picosecond optical pulse compression from gain-switched 1.3 μm distributed-feedback laser diode through highly dispersive single-mode fiber," Electron. Lett. 21, 969-971 (1985).
[CrossRef]

Takada, K.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Takahashi, R.

R. Takahashi, H. F. Liu, M. Osinski, and T. Kamiya, "Picosecond single-mode pulse compression using a 1.3 μm Fabry-Perot laser diode, a dispersion-shifted fiber, a grating monochromator," Appl. Phys. Lett. 55, 2377-2379 (1989).
[CrossRef]

Tanaka, H.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Tao, J.

Thomsen, B. C.

L. P. Barry, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, "Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5μm," Electron. Lett. 35, 1166-1168 (1999).
[CrossRef]

Unold, H. J.

Wada, K.

K. Wada, H. Sato, H. Yoshioka, T. Matsuyama, and H. Horinaka, "Suppression of side fringes in low-coherence interferometric measurements using gain- or loss-modulated multimode laser diodes" Jpn. J. Appl. Phys. 44, 8484-8490 (2005).
[CrossRef]

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

K. Wada and Y. Cho, "Improved expression for the time-bandwidth product of picosecond optical pulses from gain-switched semiconductor lasers," Opt. Lett. 19, 1633-1635 (1994).
[CrossRef] [PubMed]

K. Wada, Y. Akage, and Y. Cho, "α-parameter dependence of chirped pulse from injection-modulated semiconductor lasers," Opt. Rev. 1, 217-219 (1994).

Wang, Y.

Yamamoto, N.

K. Wada, Y. Akage, H. Marui, H. Horinaka, N. Yamamoto, and Y. Cho, "Simple method for determining the gain saturation coefficient of a distributed feedback semiconductor laser," Opt. Commun. 130, 57-62 (1996).
[CrossRef]

Yamamoto, T.

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

Yokoyama, H.

Yoshioka, H.

K. Wada, H. Sato, H. Yoshioka, T. Matsuyama, and H. Horinaka, "Suppression of side fringes in low-coherence interferometric measurements using gain- or loss-modulated multimode laser diodes" Jpn. J. Appl. Phys. 44, 8484-8490 (2005).
[CrossRef]

Zhao, W.

Appl. Opt. (1)

Appl. Phys. Lett. (1)

R. Takahashi, H. F. Liu, M. Osinski, and T. Kamiya, "Picosecond single-mode pulse compression using a 1.3 μm Fabry-Perot laser diode, a dispersion-shifted fiber, a grating monochromator," Appl. Phys. Lett. 55, 2377-2379 (1989).
[CrossRef]

Electron. Lett. (3)

L. P. Barry, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, "Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5μm," Electron. Lett. 35, 1166-1168 (1999).
[CrossRef]

K. Otsubo, M. Matsuda, K. Takada, S. Okumura, M. Ekawa, H. Tanaka, S. Ide, K. Mori, and T. Yamamoto, "Uncooled 25 Gbit/s direct modulation of semi-insulating buried-heterostructure 1.3 μm AlGaInAs quantumwell DFB lasers," Electron. Lett. 44, 631-633 (2008).
[CrossRef]

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Figures (7)

Fig. 1.
Fig. 1.

Simulated time-resolved spectrum of gain-switched pulse from 1550 nm FP laser diode. The corresponding pulse waveform and time-averaged spectrum are also shown in Fig. . A magnified view of part of the time-averaged spectrum is shown at the bottom.

Fig. 2.
Fig. 2.

Simulated time-resolved spectra and the corresponding pulse waveforms, and time-averaged spectra of gain-switched pulses obtained after passing through Michelson interferometer when delay distance Ld is set to a) 147 ΔL (~1.35 mm) and b) 354 ΔL (=3nLc ~3.24 mm), respectively. ϕint is set to a constant value of 14π/9 for both cases. Dotted sinusoidal functions in magnified views indicate energy transmittance spectra of the Michelson interferometer.

Fig. 3.
Fig. 3.

Variation of pulse duration of gain-switched pulse after passing through Michelson interferometer when delay distance is varied. ϕint is set to a constant value of 14π/9.

Fig. 4.
Fig. 4.

Simulated time-resolved spectra and the corresponding pulse waveforms, and time-averaged spectra of gain-switched pulses obtained after passing through Michelson interferometer when delay distance Ld is set to a) 236 ΔL (=2nLc ~2.16 mm), b) 708 ΔL (=6nLc ~6.48 mm), and c) 472 ΔL (=4nLc ~4.32 mm), respectively. The spectral intensity of the time-averaged spectra is magnified to three times the original intensity corresponding to Fig. 1. ϕint is set to a constant value of 14π/9 for all cases. Dotted sinusoidal functions in magnified views indicate energy transmittance spectra of the Michelson interferometer.

Fig. 5.
Fig. 5.

Experimental configuration

Fig. 6.
Fig. 6.

Time-averaged spectrum (a) and the corresponding SH autocorrelation trace (b) of an input gain-switched pulse from a 1540 nm FP laser diode.

Fig. 7.
Fig. 7.

Time-averaged spectrum (a) and the corresponding SH autocorrelation trace (b) of an output gain-switched pulse after passing through a Sagnac interferometer with a delay distance of two times the round-trip optical length of the laser cavity (~4 mm).

Tables (1)

Tables Icon

Table 1. Notation of the parameters used in the numerical simulation.

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