OTHER INTANGIBLE ASSETS

6 Months Ended

Apr. 30, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

OTHER INTANGIBLE ASSETS

OTHER INTANGIBLE ASSETS

As of the dates indicated, other intangible assets are comprised of the following (in thousands):

	April 30, 2016							October 31, 2015
	Gross Intangible		Accumulated Amortization			Net Intangible		Gross Intangible		Accumulated Amortization			Net Intangible
Developed technology	$	348,584	$	(226,517	)	$	122,067	$	506,647	$	(382,130	)	$	124,517
In-process research and development	4,405		—			4,405		—		—			—
Patents and licenses	6,565		(6,182		)	383		46,538		(46,072		)	466
Customer relationships, covenants not to compete, outstanding purchase orders and contracts	358,648		(300,583		)	58,065		388,621		(310,931		)	77,690
Total other intangible assets	$	718,202	$	(533,282	)	$	184,920	$	941,806	$	(739,133	)	$	202,673

In the second quarter of fiscal 2016, certain fully amortized intangible assets of approximately $246.4 million have been eliminated from gross intangible assets and accumulated amortization during the period, with no corresponding impact to the income statement. These assets were primarily technology for products no longer being sold by Ciena. The aggregate amortization expense of intangible assets was $40.5 million and $26.4 million for the first six months of fiscal 2016 and 2015, respectively. Expected future amortization of intangible assets for the fiscal years indicated is as follows (in thousands):

Period ended October 31,
2016 (remaining six months)	$	37,853
2017	45,447
2018	22,766
2019	22,219
2020	21,192
Thereafter	31,038
	$	180,515	(1)

(1) Does not include amortization of in-process research and development, as estimation of the timing of future amortization expense would be impractical.