Electro-absorption optical modulator having multiple quantum...

Details Electro-absorption optical modulator having multiple quantum... Electro-absorption optical modulator having multiple quantum...

2006-01-10

2006-01-10

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S248000

Reexamination Certificate

active

06985273

ABSTRACT:
Disclosed is an electro-absorption optical modulator using a semiconductor device. The optical modulator makes use of a change in light absorption caused by displacement of an absorption curve depending on a bias voltage applied to the device. Here, a level of the light absorption depending on the bias voltage is expressed as a transfer function of output light to the applied bias, and the transfer function has a non-linear profile due to a characteristic of a material. Unlike signal modulation of a digital optical communication system, an analog optical transmission system can be subjected to deterioration in performance, because the non-linear characteristic of the transfer function for the optical modulator generates signal distortion when an electrical signal is converted into an optical signal. The typical optical modulator has an absorption layer constituted of quantum wells having the same width. However, the inventive optical modulator has the absorption layer formed by the combination of quantum wells having a width different form each other, thus having excellent linearity.

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K. K. Loi, et al.; “Linearization of 1.3-μm MQW Electroabsorption Modultors Using an All-Optical Frequency-Insensitive Technique”; IEEE Photonics Technology Letters, vol. 10, No. 7; Jul. 1998; pp. 964-966.
Gordon C. Wilson, et al.; “Predistortion of Electroabsorption Modulators for Analog CATV Systems at 1.55 μm”; Journal of Lightwave Technology, vol. 15, No. 9; Sep. 1997; pp. 1654-1662.

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