<SEC-DOCUMENT>0001193125-17-242482-index.html : 20170731
<SEC-HEADER>0001193125-17-242482.hdr.sgml : 20170731
<ACCEPTANCE-DATETIME>20170731165716
ACCESSION NUMBER:		0001193125-17-242482
CONFORMED SUBMISSION TYPE:	SC TO-I/A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20170731
DATE AS OF CHANGE:		20170731

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CIENA CORP
		CENTRAL INDEX KEY:			0000936395
		STANDARD INDUSTRIAL CLASSIFICATION:	TELEPHONE & TELEGRAPH APPARATUS [3661]
		IRS NUMBER:				232725311
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		SC TO-I/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-54195
		FILM NUMBER:		17993601

	BUSINESS ADDRESS:	
		STREET 1:		7035 RIDGE ROAD
		CITY:			HANOVER
		STATE:			MD
		ZIP:			21076
		BUSINESS PHONE:		4108658500

	MAIL ADDRESS:	
		STREET 1:		7035 RIDGE ROAD
		CITY:			HANOVER
		STATE:			MD
		ZIP:			21076

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CIENA CORP
		CENTRAL INDEX KEY:			0000936395
		STANDARD INDUSTRIAL CLASSIFICATION:	TELEPHONE & TELEGRAPH APPARATUS [3661]
		IRS NUMBER:				232725311
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		SC TO-I/A

	BUSINESS ADDRESS:	
		STREET 1:		7035 RIDGE ROAD
		CITY:			HANOVER
		STATE:			MD
		ZIP:			21076
		BUSINESS PHONE:		4108658500

	MAIL ADDRESS:	
		STREET 1:		7035 RIDGE ROAD
		CITY:			HANOVER
		STATE:			MD
		ZIP:			21076
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC TO-I/A
<SEQUENCE>1
<FILENAME>d434433dsctoia.htm
<DESCRIPTION>SC TO-I/A
<TEXT>
Document 1 - file: d434433dsctoia.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.A.6
<SEQUENCE>2
<FILENAME>d434433dex99a6.htm
<DESCRIPTION>EX-99.(A)(6)
<TEXT>
Document 2 - file: d434433dex99a6.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g434433g0731185931871.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g434433g0731185931871.jpg

</DOCUMENT>
</SEC-DOCUMENT>