Exhibit 2.5 FIRST AMENDMENT TO STOCK OPTION AGREEMENT THIS FIRST AMENDMENT TO STOCK OPTION AGREEMENT (this "First Amendment") is made as of this 27th day of August, 1998 among Tellabs, Inc., a Delaware corporation ("Parent"), and CIENA Corporation, a...Stock Option Agreement • August 31st, 1998 • Tellabs Inc • Telephone & telegraph apparatus • Delaware
Exhibit 2.4 FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER THIS FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER (this "First Amendment") is made as of this 27th day of August, 1998 among Tellabs, Inc., a Delaware corporation ("Parent"), White Oak...Agreement and Plan of Merger • August 31st, 1998 • Tellabs Inc • Telephone & telegraph apparatus • Delaware
