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US 7,689,077 B1Granted
Low differential delay chromatic dispersion compensator
AssigneeInternational Business Machines Corporation
InventorCasimer M. DeCusatis
Life of this patent
Estimating the term…
Abstract
A chromatic dispersion compensator with low differential delay is provided that includes a chirped fiber Bragg grating in a compensating optical fiber core. The chirped fiber Bragg grating includes wavelength gratings spaced at distances varying with respect to the length of the compensating optical fiber core to compensate for differential delay in a synchronous time protocol for a bidirectional computer data communication link. The chromatic dispersion compensator also includes an optical junction to optically couple the chirped fiber Bragg grating to an optical fiber of the bidirectional computer data communication link.
Claims16
A chromatic dispersion compensator with low differential delay comprising:
- a chirped fiber Bragg grating in a compensating optical fiber core, the chirped fiber Bragg grating comprised of wavelength gratings spaced at distances varying with respect to the length of the compensating optical fiber core to compensate for differential delay in a synchronous time protocol for a bidirectional computer data communication link;
- and
- an optical junction to optically couple the chirped fiber Bragg grating to an optical fiber of the bidirectional computer data communication link, wherein the chirped fiber Bragg grating reduces chromatic dispersion of an optical pulse received at the chromatic dispersion compensator from the optical fiber coupled to the optical junction via reflecting longer wavelengths of the optical pulse through an optically shorter path of the chirped fiber Bragg grating and reflecting shorter wavelengths of the optical pulse through an optically longer path of the chirped fiber Bragg grating, and further wherein the optical pulse includes synchronous time protocol data in the shorter wavelengths and in the longer wavelengths, and the synchronous time protocol is a server time protocol that embeds time stamps in data streams between servers in communication via the optical fiber coupled to the optical junction.
A system comprising:
- an optical fiber in a bidirectional computer data communication link to support optical communication between servers;
- and
- a chromatic dispersion compensator coupled to the optical fiber, the chromatic dispersion compensator having a low differential delay, comprising:
- a chirped fiber Bragg grating in a compensating optical fiber core, the chirped fiber Bragg grating comprised of wavelength gratings spaced at distances varying with respect to the length of the compensating optical fiber core to compensate for differential delay in a synchronous time protocol for a bidirectional computer data communication link;
- and
- an optical junction optically coupling the chirped fiber Bragg grating to the optical fiber in the bidirectional computer data communication link, wherein the chirped fiber Bragg grating reduces chromatic dispersion of an optical pulse received at the chromatic dispersion compensator from the optical fiber coupled to the optical junction via reflecting longer wavelengths of the optical pulse through an optically shorter path of the chirped fiber Bragg grating and reflecting shorter wavelengths of the optical pulse through an optically longer path of the chirped fiber Bragg grating, and further wherein the optical pulse includes synchronous time protocol data in the shorter wavelengths and in the longer wavelengths, and the synchronous time protocol is a server time protocol that embeds time stamps in data streams between the servers.
3 more elements
A method comprising:
- linking at least two servers via a bidirectional computer data communication link comprised of optical fibers;
- coupling a chromatic dispersion compensator with low differential delay to one of the optical fibers of the bidirectional computer data communication link, the chromatic dispersion compensator comprising:
- a compensating optical fiber core with a chirped fiber Bragg grating spaced at distances varying with respect to the length of the compensating optical fiber core to compensate for differential delay in a synchronous time protocol for the bidirectional computer data communication link;
- and
- an optical junction to optically couple the chirped fiber Bragg grating to the optical fiber of the bidirectional computer data communication link;
- and
- reducing chromatic dispersion of an optical pulse received at the chromatic dispersion compensator from the bidirectional computer data communication link via reflecting longer wavelengths of the optical pulse through an optically shorter path of the chirped fiber Bragg grating and reflecting shorter wavelengths of the optical pulse through an optically longer path of the chirped fiber Bragg grating, wherein the optical pulse includes synchronous time protocol data in the shorter wavelengths and in the longer wavelengths, and the synchronous time protocol is a server time protocol that embeds time stamps in data streams between the at least two servers.
4 more elements
Dependencies are inferred from the claim text.