Optical modulator

Details Optical modulator Optical modulator

1986-06-26

1988-02-23

Tarcza, Thomas H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

357 16, H01S 300

Patent

active

047273410

ABSTRACT:
An optical modulator for varying intensity, frequency, phase and other information associated with input light in response to a voltage which is applied thereto from outside is disclosed. The modulator comprises a semiconductor substrate, at least one semiconductor ultrathin layer which is thinner than an order of electron mean free path, and electrodes capable of applying an electric field to said ultrathin layer in a perpendicular direction to the layers. The band gap of narrow band gap layers in the ultrathin layer is spatially varied with respect to the perpendicular direction to the layers. The band gap of the narrow band gap layers is monotonously varied in the perpendicular direction to the layers. The ultrathin layer is interposed between a p-type semiconductor and an n-type semiconductor with respect to the perpendicular direction to the layers, a band gap of semiconductor layers in the ultrathin layer and having a narrow band gap being sequentially narrowed toward the p-type semiconductor layer. The band gap of semiconductor layers in the ultrathin layer and having a narrow band gap is largest in the vicinity of the center and sequentially reduced toward opposite ends.

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patent: 4616244 (1986-10-01), Yamazaki
patent: 4620214 (1986-10-01), Margalit et al.
Wood et al, "High-Speed Optical Modulation with GAAS/GaAlAs Guantum Wells in a Pin Diode Structure", Appl. Phys. Lett., vol. 44. No. 1, 1984.
Bastard et al, "Variational Calculations on a Guantum Well in an Electric Field", Phys. Rev. B, vol. 28, p. 3241, 1983.

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