<PAGE> 1
Filed Pursuant to Rule 424(b)(3)
Registration No.: 333-80375
Prospectus Supplement Dated June 12, 2000
(To Prospectus Dated August 30, 1999)
CIENA Corporation
13,166,284 Shares of Common Stock
The information in this prospectus supplement supplements the information
set forth under the caption "Selling Stockholders" in the prospectus.
SELLING STOCKHOLDERS
The following information supplements the information set forth under the
caption "Selling Stockholders" in the prospectus:
<TABLE>
<CAPTION>
PERCENTAGE OF TOTAL CIENA
NUMBER OF SHARES OUTSTANDING SHARES NUMBER AND PERCENTAGE OF
BENEFICIALLY OWNED BEFORE BENEFICIALLY OWNED BEFORE NUMBER OF SHARES SHARES BENEFICIALLY OWNED
SELLING STOCKHOLDERS THE OFFERING THE OFFERING OFFERED AFTER THE OFFERING
-------------------- ------------ ------------ ------- ------------------
<S> <C> <C> <C> <C>
JANCI Foundation(1) 5,000 * 5,000 0
</TABLE>
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(1) JANCI Foundation is the transferee of 5,000 shares listed in the prospectus
as being held by Jeffrey Weiss.
