<SEC-DOCUMENT>0000930413-18-000389-index.html : 20180214
<SEC-HEADER>0000930413-18-000389.hdr.sgml : 20180214
<ACCEPTANCE-DATETIME>20180213192141
ACCESSION NUMBER:		0000930413-18-000389
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180214
DATE AS OF CHANGE:		20180213

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 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-54195
		FILM NUMBER:		18606131

	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:			TIAA CREF INVESTMENT MANAGEMENT LLC
		CENTRAL INDEX KEY:			0000887793
		IRS NUMBER:				133586142
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		730 THIRD AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017-3206
		BUSINESS PHONE:		2129166042

	MAIL ADDRESS:	
		STREET 1:		730 THIRD AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017-3206

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TIAA CREF INVESTMENT MANAGEMENT INC
		DATE OF NAME CHANGE:	19980223
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>c90282_sc13ga.htm
<TEXT>
Document 1 - file: c90282_sc13ga.htm

</DOCUMENT>
</SEC-DOCUMENT>