Abstract

When the current through the junction of a light emitting diode (LED) is modulated, there is a delay between the modulation and the response of the optical signal to this modulation. We have recently observed that this delay is not the same at different parts of the LED’s optical spectrum. This effect, the relative delay between spectral components, we call chromatic delay. This paper reports the results of measurements of chromatic delay for several LED’s of various kinds. This effect amounts to delays of the order of 200–300 psec between half power points of the LED spectrum. Thus it establishes a lower limit on the rise time achievable from these devices.

© 1974 Optical Society of America

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References

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  1. C. A. Burrus, R. W. Dawson, Appl. Phys. Lett. 17, 97 (1970).
    [CrossRef]
  2. C. A. Burrus, E. A. Ulmer, Proc. IEEE 59, 1263 (1971).
    [CrossRef]
  3. C. A. Burrus, B. I. Miller, Opt. Commun. 4, 307 (1971).
    [CrossRef]

1971 (2)

C. A. Burrus, E. A. Ulmer, Proc. IEEE 59, 1263 (1971).
[CrossRef]

C. A. Burrus, B. I. Miller, Opt. Commun. 4, 307 (1971).
[CrossRef]

1970 (1)

C. A. Burrus, R. W. Dawson, Appl. Phys. Lett. 17, 97 (1970).
[CrossRef]

Burrus, C. A.

C. A. Burrus, E. A. Ulmer, Proc. IEEE 59, 1263 (1971).
[CrossRef]

C. A. Burrus, B. I. Miller, Opt. Commun. 4, 307 (1971).
[CrossRef]

C. A. Burrus, R. W. Dawson, Appl. Phys. Lett. 17, 97 (1970).
[CrossRef]

Dawson, R. W.

C. A. Burrus, R. W. Dawson, Appl. Phys. Lett. 17, 97 (1970).
[CrossRef]

Miller, B. I.

C. A. Burrus, B. I. Miller, Opt. Commun. 4, 307 (1971).
[CrossRef]

Ulmer, E. A.

C. A. Burrus, E. A. Ulmer, Proc. IEEE 59, 1263 (1971).
[CrossRef]

Appl. Phys. Lett. (1)

C. A. Burrus, R. W. Dawson, Appl. Phys. Lett. 17, 97 (1970).
[CrossRef]

Opt. Commun. (1)

C. A. Burrus, B. I. Miller, Opt. Commun. 4, 307 (1971).
[CrossRef]

Proc. IEEE (1)

C. A. Burrus, E. A. Ulmer, Proc. IEEE 59, 1263 (1971).
[CrossRef]

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Figures (6)

Fig. 1
Fig. 1

Entire arrangement of equipment used in performing this experiment.

Fig. 2
Fig. 2

Delay observed between the 0.86-μm and 0.90-μm wavelength: (A) without constant optical signal at the receiver; (B) with constant optical signal at the receiver.

Fig. 3
Fig. 3

Amplitude and chromatic delay vs wavelength; LED 1 is a single heterostructure device, and LED 2 is a double heterostructure device.

Fig. 4
Fig. 4

Chromatic delay vs wavelength for three diffused junction LED’s. The symbols at the lower portion of the graph indicate the centers of their respective spectra.

Fig. 5
Fig. 5

Chromatic delay vs wavelength for four single heterostructure LED’s. The symbols at the lower portion of the graph indicate the centers of their respective spectra.

Fig. 6
Fig. 6

Chromatic delay vs wavelength for three double heterostructure LED’s. The symbols at the lower portion of the graph indicate the centers of their respective spectra.

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