CONVERTIBLE NOTES PAYABLE

The principal balance, unamortized discount and net carrying amount of the liability and equity components of our 4.0% convertible senior notes due December 15, 2020 Notes ("2020 Notes") were as follows as of January 31, 2014



	Liability Component						Equity Component
	Principal Balance		Unamortized Discount		Net Carrying Amount		Net Carrying Amount
4.0% Convertible Senior Notes due December 15, 2020	$	191,333	$	15,877	$	175,456	$	43,131

The following table sets forth, in thousands, the carrying value and the estimated fair value of Ciena’s outstanding convertible notes:



	January 31, 2014
	Carrying Value		Fair Value⁽²⁾
4.0% Convertible Senior Notes, due March 15, 2015 ⁽¹⁾	187,690		241,055
0.875% Convertible Senior Notes due June 15, 2017	500,000		511,250
3.75% Convertible Senior Notes due October 15, 2018	350,000		499,406
4.0% Convertible Senior Notes due December 15, 2020 ⁽³⁾	175,456		271,941
	$	1,213,146	$	1,523,652


(1)	Includes unamortized bond premium related to embedded redemption feature.


(2)	The convertible notes were categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its outstanding convertible notes using a market approach based upon observable inputs, such as current market transactions involving comparable securities.


(3)	Includes unamortized discount and accretion of principal.