Frequency tunable optical oscillator with fiber grating mirrors

Details Frequency tunable optical oscillator with fiber grating mirrors Frequency tunable optical oscillator with fiber grating mirrors

2005-07-12

2005-07-12

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular beam control device

Tuning

C372S026000, C372S027000, C372S028000, C372S094000, C372S099000, C372S102000

Reexamination Certificate

active

06917633

ABSTRACT:
There is provided a millimeter wave band frequency optical oscillator predicted to be used as a millimeter wave oscillating frequency signal source in a base station of a millimeter wave wireless transmission system. The optical oscillator has a double resonator structure in which a pair of wavelength tunable fiber grating mirrors are inserted into a unilateral fiber-ring laser resonator in order to internally and additionally form a linear laser resonator. The double resonator structure composed of the two stable laser resonators can oscillate laser of two modes. Due to a beat phenomenon occurring between the two modes, received laser is modulated to an ultra-speed frequency of 60 GHz or greater. A variation in the gain within a resonator is induced by a polarization controller using the dependency of laser modes upon polarization. A modulation frequency is consecutively changed from 60 GHz to 80 GHz by controlling the wavelength of light reflected by the fiber grating mirrors.

REFERENCES:
patent: 5623508 (1997-04-01), Grubb et al.

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