Abstract

We have synchronized a pair of femtosecond, passively mode-locked Er-doped fiber lasers by active adjustment of the cavity length of one laser with an electronic servo. While each laser delivers pulses with durations of several hundred femtoseconds, they have been synchronized to within a relative timing jitter of 5 ps rms, as measured by cross correlation. This corresponds to a phase error of 30 arcsec. Low drift and jitter were accomplished by thermal and mechanical coupling of the two lasers.

© 1996 Optical Society of America

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References

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  1. D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
    [CrossRef]
  2. S. B. Darak, D. R. Dykaar, G. T. Harvey, Opt. Lett. 16, 1677 (1991).
    [CrossRef]
  3. Spectra-Physics Lok-to-Clock system.
  4. H. A. Haus, A. Mecozzi, IEEE J. Quantum Electron. 29, 983 (1993).
    [CrossRef]
  5. D. E. Spence, J. M. Dudley, K. Lamb, W. E. Sleat, W. Sibbett, Opt. Lett. 19, 481 (1994).
    [CrossRef] [PubMed]
  6. M. E. Fermann, L. M. Yang, M. L. Stock, M. J. Andrejco, Opt. Lett. 19, 43 (1994).
    [CrossRef] [PubMed]
  7. This type of assembly could, in principle, be integrated into a pigtailed unit.
  8. This is probably an aliasing effect: The closed-loop feedback system (including the lasers) has a resonance near 31 Hz, which could cause real timing jitter at the same frequency. This would be undersampled by the 34-Hz sampling rate of the correlator, causing a spurious signal near 3 Hz.

1994 (2)

1993 (2)

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

H. A. Haus, A. Mecozzi, IEEE J. Quantum Electron. 29, 983 (1993).
[CrossRef]

1991 (1)

Andrejco, M. J.

Darak, S. B.

Dudley, J. M.

Dykaar, D. R.

Evans, J. M.

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

Fermann, M. E.

Harvey, G. T.

Haus, H. A.

H. A. Haus, A. Mecozzi, IEEE J. Quantum Electron. 29, 983 (1993).
[CrossRef]

Kapfka, J. D.

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

Lamb, K.

Mecozzi, A.

H. A. Haus, A. Mecozzi, IEEE J. Quantum Electron. 29, 983 (1993).
[CrossRef]

Sibbett, W.

D. E. Spence, J. M. Dudley, K. Lamb, W. E. Sleat, W. Sibbett, Opt. Lett. 19, 481 (1994).
[CrossRef] [PubMed]

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

Sleat, W. E.

D. E. Spence, J. M. Dudley, K. Lamb, W. E. Sleat, W. Sibbett, Opt. Lett. 19, 481 (1994).
[CrossRef] [PubMed]

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

Spence, D. E.

D. E. Spence, J. M. Dudley, K. Lamb, W. E. Sleat, W. Sibbett, Opt. Lett. 19, 481 (1994).
[CrossRef] [PubMed]

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

Stock, M. L.

Yang, L. M.

IEEE J. Quantum Electron. (1)

H. A. Haus, A. Mecozzi, IEEE J. Quantum Electron. 29, 983 (1993).
[CrossRef]

Opt. Commun. (1)

D. E. Spence, W. E. Sleat, J. M. Evans, W. Sibbett, J. D. Kapfka, Opt. Commun. 101, 286 (1993).
[CrossRef]

Opt. Lett. (3)

Other (3)

Spectra-Physics Lok-to-Clock system.

This type of assembly could, in principle, be integrated into a pigtailed unit.

This is probably an aliasing effect: The closed-loop feedback system (including the lasers) has a resonance near 31 Hz, which could cause real timing jitter at the same frequency. This would be undersampled by the 34-Hz sampling rate of the correlator, causing a spurious signal near 3 Hz.

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Figures (3)

Fig. 1
Fig. 1

Experimental configuration of twin fiber laser. Both master and slave lasers are wrapped on the same spool. The master laser is terminated by a Faraday rotator mirror (FRM); the slave laser is terminated by a Faraday rotator mirror assembly (PZT-FRM) containing a piezoelectric-transducer-mounted mirror. Other components are a half-wave plate (λ/2), quarter-wave plates (λ/4’s), a polarizing beam splitter (PBS), Faraday rotators (FR’s), a saturable absorber (SA), photodiodes (PD-1, PD-2), and Faraday rotators (FR’s).

Fig. 2
Fig. 2

Relative and absolute timing drift over a time period of 500 s. Data are unfolded with respect to the 216-ns repetition period.

Fig. 3
Fig. 3

(a) Time series of cross-correlation peak delay data recorded over 200 s; the inset shows data from a 2-s subinterval (60 data points). (b) Graph of time-series data. (c) Power spectrum of time-series data.

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