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:
Jul. 13, 2004
Filed:
Sep. 06, 2001
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
This invention provides a gain control device and method for an erbium doped fiber amplifier that is capable of maintaining a constant gain irrespective of the intensity variation of the input signal light. The gain control device includes: a pumping light source for outputting pumping light adapted to excite erbium ions for the amplification of an input optical signal while outputting a pumping light sensing signal indicative of the power of the pumping light; a photo-detecting unit for outputting an input light sensing signal indicative of the power of the input optical signal; a control unit for reading out from a look-up table a reference power corresponding to the optical signal power indicated by the input light sensing signal and outputting a reference signal indicative of the read-out reference power; an automatic gain control circuit for conducting a comparison between the reference power and the pumping light power based on the pumping light sensing signal and the reference signal, and for outputting a power compensating signal adapted to compensate for the difference between the reference power and the pumping light power; and, a pumping light source driving unit for controlling the level of a bias current supplied to the pumping light source based on the power compensating signal.