H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/02 (2006.01) H04B 10/14 (2006.01) H04B 10/145 (2006.01) H04B 10/155 (2006.01) H04B 10/158 (2006.01)
Patent
CA 2006125
One aspect of the invention is a Fabry-Perot cavity which comprises in part a waveguiding portion and in part a nonwaveguiding portion. In this manner, a cavity is constructed whose length would be too short to manipulate effectively if it were comprised exclusively of a waveguiding portion, and whose length might haveunacceptable diffraction losses if it were comprised exclusively of a nonwaveguiding portion. In the inventive device the resonant wavelength can be adjusted by varying the length of either the gap or the waveguide or both. The device can be advantageously constructed and aligned using fiber coupling technology. In another aspect of the invention, a light source comprising a source of radiation such as a single-electrode distributed feedback semiconductor laser diode is frequency by direct current modulation with no pre-equalization or pre- distortion of the signal, and the optical signal is coupled to and carried by an optical fiber to a remote location. At the remote location, an optical discriminator such as a fiber Fabry-Perot interferometer can be used for both channel selection where more than one channel is being carried by the optical fiber and for covering the frequency modulation signal of each channel to an amplitude modulated signal. The amplitude modulated signal can be detected by a direct detection receiver. In those instances where signal enchancement is required, such as in long-haul lightwave transmission systems, an optical amplifier can be substituted for the normally mandatory regenerator located at the repeater stations.
Chraplyvy Andrew R.
Iannone Patrick P.
Kaminow Ivan P.
Li Tingye
Stone Julian
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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