Optical device for modulating a high frequency optical signal

Details Optical device for modulating a high frequency optical signal Optical device for modulating a high frequency optical signal

2000-11-13

2001-11-27

Epps, Georgia (Department: 2873)

Coherent light generators

Optical fiber laser

C372S018000, C372S094000

Reexamination Certificate

active

06324189

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an optical device for generating a high frequency optical signal; and, more particularly, to an optical device incorporating therein a ring oscillator and a linear oscillator for inducing a beat phenomenon which is used for generating a high frequency optical signal.
DESCRIPTION OF THE PRIOR ART
As is well known, a semiconductor laser has achieved substantial success as a light source and an oscillator in fiber optic communication systems because of their capability to provide a high speed, a direct current modulation and their relative low cost per component.
However, there is still a demand for developing a high frequency light source to implement a wireless multimedia technology in coupled with the high speed fiber communication network. In order to meet this demand, several studies for applying the semiconductor laser diode to the high frequency light source have been developed recently.
But, the semiconductor laser diode has an inherent shortcoming that it has a low modulation frequency range.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide an optical device incorporating therein a ring oscillator and a linear oscillator coupled to the ring oscillator for generating a high frequency optical signal by using a beat phenomenon between the ring and the linear oscillators.
In accordance with one aspect of the present invention, there is provided an optical device for modulating a high frequency optical signal, comprising: a light source for generating a pumping light beam; a first oscillator for generating a first light beam with a plurality of modes by using the pumping light beam; an optical element for selecting a first mode from the modes; a second oscillator for generating a second light beam of a second mode by using the selected first mode; and an optical coupler for coupling the selected first mode to the second mode to induce a beat phenomenon therebetween, whereby the first oscillator outputs the high frequency optical signal generated by the beat phenomenon.


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