EXHIBIT 8.1 [SIDLEY & AUSTIN LETTERHEAD] February 7, 2000 Tellabs, Inc. 4951 Indiana Avenue Lisle, Illinois 60532-1698 Ladies and Gentlemen: We refer to the Agreement and Plan of Merger (the "Agreement") dated as of December 21, 1999, by and among...Agreement and Plan of Merger • February 7th, 2000 • Tellabs Inc • Telephone & telegraph apparatus
February 7, 2000Merger Agreement • February 7th, 2000 • Tellabs Inc • Telephone & telegraph apparatus
