Optical monitoring apparatus for use in wavelength division multiplexing network
AssigneeNational Chiao Tung University
InventorsSien Chi, Chien-Chung Lee, Chien-Hung Yeh
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Abstract
An optical monitoring apparatus based on the scanning of the gain profile of erbium-doped fiber amplifiers (EDFA) and applied in a wavelength division multiplexing network has been proposed and experimentally demonstrated. The EDFA with an injected saturated tone can provide variable gain or loss profile by controlling the pump power. The components used in the present optical monitoring apparatus for use in a wavelength division multiplexing network are easily available and cost-effective, valuable for monitoring frequency and power of a WDM optical communication system, and capable of greatly enhancing resolution of monitoring frequency spectrum for the optical fiber network system.
Claims6
An optical monitoring apparatus for use in a wavelength division multiplexing network for monitoring a wavelength division multiplexing (WDM) signal in a network system, comprising:
- a pump laser;
- a WDM coupler for coupling said WDM signal and said pump laser;
- an erbium-doped fiber that is 6 meters in length receiving said WDM signal and said pump laser transmitted from said WDM signal, and scanning gain profile of said WDM signal;
- a saturated tone light source for controlling said gain profile of said WDM signal;
- an optical circulator coupled with said erbium-doped fiber, receiving said saturated tone light source, and subsequently outputting an output signal with a specified frequency;
- and
- wherein said saturated tone light source is a distributed feedback (DFB) laser with a wavelength of 1540 nm and power of 15 dBm.
Dependencies are inferred from the claim text.