The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2003
Filed:
May. 07, 2001
Lianhua Ji, Boulder, CO (US);
Jiuzhi Xue, Broomfield, CO (US);
Photonport Technologies, Inc., Boulder, CO (US);
Abstract
A variable optical attenuator having a multiple quantum well structure (MQWS), a feedback system that provides a feedback signal, and a current control that utilizes the feedback signal to regulate the attenuation of the MQWS. In one embodiment, the MQWS is part of a photo intrinsic diode, and in another embodiment it is part of a self-electro-optic effect device (SEED). Preferably, there are a plurality of MQWSs, which may be arranged in a serial stack or may be arranged in a plane parallel to the MQWS layers, with light passed from one MQWS to the next via prisms. Preferably, the beam is separated into component wavelengths by a demultiplexer, each wavelength is attenuated by one or more MQWSs designed to attenuate that wavelength, and the beam is then recombined with an optical multiplexer. In another embodiment, the attenuator is combined with an erbium-doped fiber amplifier (EDFA) to provide an amplifier having an essentially flat gain as a function of wavelength.