Abstract

Knowledge of the baseband frequency responses of optical components is prerequisite to the design of optical fiber transmission systems. The sweep-frequency method is effective for obtaining frequency responses because of its large SNR. However, the use of GaAs lasers as optical signal sources involves several problems such as resonances below 1 GHz and spectrum broadening. In order to overcome these problems, a single transverse mode GaAs laser called a buried heterostructure GaAs laser was employed as an optical signal source in the sweep-frequency measurement system. This measurement system has a wideband flat sweep-frequency range of 0.5–1300 MHz as well as a wide dynamic range of more than 60 dB at optical levels.

© 1978 Optical Society of America

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References

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  1. I. Kobayashi, M. Koyama, Trans. IECE, Jpn. E59, 11 (April1976).
  2. R. Auffret, C. Boisrobert, A. Cozannet, presented at First European Conference on Optical Fibre Communication, London (September 1975).
  3. C. Y. Boisrobert, J Debeau, A. H. Hartog, Opt. Commun. 19, 305 (1976).
    [CrossRef]
  4. T. Ikegami, presented at First European Conference on Optical Fibre Communication, London (September 1975).
  5. M. Maeda et al., presented at Third European Conference on Optical Fibre Communication, Munchen (September 1977).
  6. K. Nagano et al., submitted to Trans. IECE, Jpn.
  7. K. Berchtold, O. Krumpholz, J. Suri, Appl. Phys. Lett. 26, 585 (1975).
    [CrossRef]
  8. M. Maeda, S. Yamada, Appl. Opt. 16, 2198 (1977).
    [CrossRef] [PubMed]
  9. S. Onoda, T. P. Tanaka, M. Sumi, Appl. Opt. 15, 1930 (1976).
    [CrossRef] [PubMed]

1977 (1)

1976 (3)

S. Onoda, T. P. Tanaka, M. Sumi, Appl. Opt. 15, 1930 (1976).
[CrossRef] [PubMed]

I. Kobayashi, M. Koyama, Trans. IECE, Jpn. E59, 11 (April1976).

C. Y. Boisrobert, J Debeau, A. H. Hartog, Opt. Commun. 19, 305 (1976).
[CrossRef]

1975 (1)

K. Berchtold, O. Krumpholz, J. Suri, Appl. Phys. Lett. 26, 585 (1975).
[CrossRef]

Auffret, R.

R. Auffret, C. Boisrobert, A. Cozannet, presented at First European Conference on Optical Fibre Communication, London (September 1975).

Berchtold, K.

K. Berchtold, O. Krumpholz, J. Suri, Appl. Phys. Lett. 26, 585 (1975).
[CrossRef]

Boisrobert, C.

R. Auffret, C. Boisrobert, A. Cozannet, presented at First European Conference on Optical Fibre Communication, London (September 1975).

Boisrobert, C. Y.

C. Y. Boisrobert, J Debeau, A. H. Hartog, Opt. Commun. 19, 305 (1976).
[CrossRef]

Cozannet, A.

R. Auffret, C. Boisrobert, A. Cozannet, presented at First European Conference on Optical Fibre Communication, London (September 1975).

Debeau, J

C. Y. Boisrobert, J Debeau, A. H. Hartog, Opt. Commun. 19, 305 (1976).
[CrossRef]

Hartog, A. H.

C. Y. Boisrobert, J Debeau, A. H. Hartog, Opt. Commun. 19, 305 (1976).
[CrossRef]

Ikegami, T.

T. Ikegami, presented at First European Conference on Optical Fibre Communication, London (September 1975).

Kobayashi, I.

I. Kobayashi, M. Koyama, Trans. IECE, Jpn. E59, 11 (April1976).

Koyama, M.

I. Kobayashi, M. Koyama, Trans. IECE, Jpn. E59, 11 (April1976).

Krumpholz, O.

K. Berchtold, O. Krumpholz, J. Suri, Appl. Phys. Lett. 26, 585 (1975).
[CrossRef]

Maeda, M.

M. Maeda, S. Yamada, Appl. Opt. 16, 2198 (1977).
[CrossRef] [PubMed]

M. Maeda et al., presented at Third European Conference on Optical Fibre Communication, Munchen (September 1977).

Nagano, K.

K. Nagano et al., submitted to Trans. IECE, Jpn.

Onoda, S.

Sumi, M.

Suri, J.

K. Berchtold, O. Krumpholz, J. Suri, Appl. Phys. Lett. 26, 585 (1975).
[CrossRef]

Tanaka, T. P.

Yamada, S.

Appl. Opt. (2)

Appl. Phys. Lett. (1)

K. Berchtold, O. Krumpholz, J. Suri, Appl. Phys. Lett. 26, 585 (1975).
[CrossRef]

Opt. Commun. (1)

C. Y. Boisrobert, J Debeau, A. H. Hartog, Opt. Commun. 19, 305 (1976).
[CrossRef]

Trans. IECE, Jpn. (1)

I. Kobayashi, M. Koyama, Trans. IECE, Jpn. E59, 11 (April1976).

Other (4)

R. Auffret, C. Boisrobert, A. Cozannet, presented at First European Conference on Optical Fibre Communication, London (September 1975).

T. Ikegami, presented at First European Conference on Optical Fibre Communication, London (September 1975).

M. Maeda et al., presented at Third European Conference on Optical Fibre Communication, Munchen (September 1977).

K. Nagano et al., submitted to Trans. IECE, Jpn.

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Figures (7)

Fig. 1
Fig. 1

Schematic diagram of a baseband frequency response measurement system.

Fig. 2
Fig. 2

Light output vs laser current characteristics of a GaAs BH laser used in this system.

Fig. 3
Fig. 3

Optical signal waveforms obtained from the BH laser, shown with modulation signal amplitude as a parameter. The waveforms (a), (b), and (c) correspond to modulation signals of 4 mA, 2.8 mA, and 2 mA peak to peak, respectively, superimposed on a 23-mA dc biasing current.

Fig. 4
Fig. 4

Baseband spectra of the optical signal waveforms shown with a vertical axis of 10 dB/div and a horizontal axis of 5 MHz/div. The spectra (a) and (b) correspond to the waveforms (a) and (b) shown in Fig. 3, respectively.

Fig. 5
Fig. 5

Baseband frequency responses of the measurement system, shown with avalanche photodiode multiplication factor M as a parameter.

Fig. 6
Fig. 6

Receiver output measured as a function of average received optical power.

Fig. 7
Fig. 7

Measured baseband frequency responses of a W-fiber. The fiber parameters are as follows: refractive index difference 1 − p = 0.2% and 1 − q = 0.6%, core diameter 2a = 60 μm, intermediate layer thickness δa = 6.5 μm, and fiber length L = 46.5 m.

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