Abstract

This Letter reports on picosecond pulse generation at a repetition of 10GHz by using a single-stage electro-optic LiNbO3 Mach–Zehnder modulator, stressing the simplicity of its setup. It is analytically and experimentally proved that dual-arm modulation with in-phase sinusoidal signals having slightly different amplitudes generated a highly coherent optical comb with a great spectral flatness and a parabolic phase relationship in its spectrum. The generated comb was Fourier synthesized and shaped into an ultrashort pulse train with an optical bandpass filter and a dispersive fiber. The pulse source was highly stable, exhibiting an ultralow timing jitter of less than 130fs.

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References

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2007

2005

J. Kondo, K. Aoki, A. Kondo, T. Ejiri, Y. Iwata, A. Hamajima, T. Mori, Y. Mizuno, M. Imaeda, Y. Kozuka, O. Mitomi, and M. Minakata, IEEE Photon. Technol. Lett. 17, 2077 (2005).
[CrossRef]

2001

K. Igarashi, M. Kishi, and M. Tsuchiya, Jpn. J. Appl. Phys., Part 1 40, 6426 (2001).
[CrossRef]

1997

M. Nakazawa, E. Yoshida, and K. Tamura, Electron. Lett. 33, 1318 (1997).
[CrossRef]

1983

M. Izutsu and T. Sueta, IEEE J. Quantum Electron. QE-19, 668 (1983).
[CrossRef]

1980

E. P. Ippen, D. J. Eilenberger, and R. W. Dixon, Appl. Phys. Lett. 37, 267 (1980).
[CrossRef]

Appl. Phys. Lett.

E. P. Ippen, D. J. Eilenberger, and R. W. Dixon, Appl. Phys. Lett. 37, 267 (1980).
[CrossRef]

Electron. Lett.

M. Nakazawa, E. Yoshida, and K. Tamura, Electron. Lett. 33, 1318 (1997).
[CrossRef]

IEEE J. Quantum Electron.

M. Izutsu and T. Sueta, IEEE J. Quantum Electron. QE-19, 668 (1983).
[CrossRef]

IEEE Photon. Technol. Lett.

J. Kondo, K. Aoki, A. Kondo, T. Ejiri, Y. Iwata, A. Hamajima, T. Mori, Y. Mizuno, M. Imaeda, Y. Kozuka, O. Mitomi, and M. Minakata, IEEE Photon. Technol. Lett. 17, 2077 (2005).
[CrossRef]

Jpn. J. Appl. Phys., Part 1

K. Igarashi, M. Kishi, and M. Tsuchiya, Jpn. J. Appl. Phys., Part 1 40, 6426 (2001).
[CrossRef]

Opt. Lett.

Other

Y. Takita, F. Futami, M. Doi, and S. Watanabe, in Conference on Laser and Electro-Optics (CLEO'04) (Optical Society of America, 2004), paper CTuN1.

M. Sugiyama, M. Doi, S. Taniguchi, T. Nakazawa, and H. Onaka, in Optical Fiber Communication Conference (OFC'02) (Optical Society of America, 2002), pp. 854-856.
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

(A) Generation of ultrashort pulses by using a single-stage conventional Mach–Zehnder modulator. (B) Experimental setup: LD, laser diode; PC, polarization controller; MZM, Mach–Zehnder modulator; ATT, rf attenuator; EDFA, erbium-doped fiber amplifier; BPF, optical bandpass filter; SMF, standard single-mode fiber; PD, photodiode.

Fig. 2
Fig. 2

Pulse width measured as a function of SMF length. Circles, without filter; squares, with 1.5 nm filter; triangles, with 1 nm filter.

Fig. 3
Fig. 3

(Left) Optical spectra and (right) autocorrelation traces (a) without filtering; (b) sync 2 -like shape, (c) Gaussian-like shape.

Equations (4)

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E out = 1 2 E 0 k = [ J k ( A 1 ) e j ( k ω t + θ 1 ) + J k ( A 2 ) e j ( k ω t + θ 2 ) ] E 0 2 2 π A ¯ 1 / 2 k = { cos ( A ¯ ( 2 k + 1 ) π 4 + 4 k 2 1 2 8 A ¯ 1 + Δ A ) e j Δ θ + cos ( A ¯ ( 2 k + 1 ) π 4 + 4 k 2 1 2 8 A ¯ 1 Δ A ) e j Δ θ } e j ( θ ¯ + k ω t ) ,
Δ A ± Δ θ = π 2 .
A k = E 0 sin ( 2 Δ θ ) 2 π A ¯ , Φ k = ± 4 k 2 1 8 A ¯ ,
L = 2 Φ k k 2 ( β 2 ω 0 2 ) 1 = ( β 2 A ¯ ω 0 2 ) 1 ,

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