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US 6,208,780 B1Granted
System and method for optical monitoring
AssigneeLucent Technologies Inc.
InventorsYuan Li, Yan Wang
Life of this patent
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AssigneeLucent Technologies Inc.
InventorsYuan Li, Yan Wang
Estimating the term…
An optical filter, system, and method capable of detecting optical signals in an optical fiber trunk for purposes of diagnostics and control of a wavelength division multiplexing system using optical fiber network. The optical filter is described comprising a predetermined number N of cascaded Mach-Zender circuits having a predetermined transfer function with a predetermined scanning peak, the cascaded Mach-Zender circuits having an optical input and an optical output. In another embodiment, a system is provided which employs the optical filter in which a control circuit coupled to each of the Mach-Zender circuits to shift the scanning peak according to a predetermined criterion. The control circuit advantageously causes a phase shift in the Mach-Zender circuits, thereby allowing the optical filter to scan a predetermined frequency spectrum with a narrow pass band or scanning peak to determine the existence and/or the condition of optical signals within the predetermined frequency spectrum.
An optical filter, comprising a plurality N of cascaded Mach-Zender circuits that provide phase shifts whose magnitudes have binary relationship to each other, coupled together using a plurality of single port connections, the optical filter configurable with a determinable transfer function having a resultant peak, the cascaded Mach-Zender circuits having an opitical input and an optical output.
A system for monitoring optical signals in a wavelength division multiplexing system, comprising:
A system for monitoring optical signals in a wavelength division multiplexing system, comprising:
A method for monitoring optical signals in a wavelength division multiplexing system, comprising the steps of:
Dependencies are inferred from the claim text.