Modulation frequency tunable optical oscillator

Details Modulation frequency tunable optical oscillator Modulation frequency tunable optical oscillator

2005-12-13

2005-12-13

Song, Sarah (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S027000, C372S094000, C372S102000, C372S006000

Reexamination Certificate

active

06975796

ABSTRACT:
The present invention relates to a millimeter wave frequency band optical oscillator used for an oscillating frequency signal source of millimeter waves transmitted from a repeater to a wireless subscriber in a millimeter wave wireless subscriber communication system for a next-generation (i.e., 5th generation or less) very high speed wireless internet service, wherein a loop mirror and a pair of optical fiber grating mirrors are used. A wavelength fixed type and a wavelength tunable type optical fiber grating mirrors are connected in a serial manner to constitute a dual laser mode resonator capable of simultaneously oscillating two laser modes, which are appropriate to each wavelength. Therefore, it is possible to obtain a laser light source capable of an extremely high frequency (60 GHz or more) modulation by using beat phenomena between two laser modes.

REFERENCES:
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Henrik Ahlfeldt et al.; “20GHz Bandwidth of Lasers Flip-Chip-Mounted on Microstructured Carrers with Intgrated Electrical Waveguides”; ECOC'98, 20-24; Sep. 1998, Madrid, Spain; pp. 205-206.
Hiroaki Sanjoh et al.; “A Precisely Spaced Multiwavelength Light Source with a Pulsed Serrodyne Frequency Shifter in an Optical Ring Circuit”; Tunable And Multiwavelength Lasers 3.3.5., no date.
Ho-Young Kim et al.; “Millimeterwave frequency modulated lasers using the wavelength dependent birefringences inside the coupled fiber cavity”; P-7; pp. 125-129, no date.

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