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AssigneeInternational Business Machines Corporation
InventorsCasimer M. DeCusatis, Lawrence Jacobowitz
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A method and system for dispersion control of electromagnetic signals in communication networks by narrowing the widths of electromagnetic pulses such as modulated laser signals. Generally, in the preferred embodiment, the present invention utilizes a feedback loop based on dither frequency modulation which dynamically adjusts the alignment of the laser center frequency with the filter passband. In this way, there is an acceptable tradeoff between optical power and pulse width, so a higher power laser can be used to generate a narrower optical pulse. The narrower pulses then travel farther in the fiber link before reaching their dispersion limit. It is believed that, by using this invention, existing link distance could be doubled, while re-using existing installed singlemode fiber. The systems employing the feedback loop may be information carrying or control systems.
A control circuit for narrowing the pulse width of electromagnetic signals in communication networks by aligning an electromagnetic signal having a peaked spectrum function including a center wavelength and a wavelength selective device implementing a peaked passband function including a center wavelength, said circuit comprising:
A method for narrowing the pulse width of electromagnetic signals in communication networks by mutually aligning a center wavelength of an electromagnetic signal having a peaked spectrum function with a center wavelength of a wavelength selective device implementing a peaked passband function, said method comprising the steps of:
A control circuit for adjusting an electromagnetic signal having a peaked spectrum function including a center wavelength, said circuit comprising:
A method for adjusting a center wavelength of an electromagnetic signal of having a peaked spectrum function, said method comprising the steps of:
Dependencies are inferred from the claim text.