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Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2014
Intangible Assets [Abstract]  
Schedule of finite-lived intangible assets
The following table sets forth the carrying value of intangible assets by reporting segment:

(in thousands)
 
As of September 30, 2014
 
As of September 30, 2013
 
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Assets
 
Gross Assets
 
Accumulated
Amortization
 
Net
Assets
Fiber Optics:
 
 
 
 
 
 
 
 
 
 
 
 
   Core Technology
 
$
12,727

 
$
(12,243
)
 
$
484

 
$
12,727

 
$
(11,822
)
 
$
905

   Customer Relations
 
3,511

 
(2,935
)
 
576

 
3,511

 
(2,647
)
 
864

   Patents
 
4,697

 
(4,615
)
 
82

 
4,697

 
(4,498
)
 
199

 
 
20,935

 
(19,793
)
 
1,142

 
20,935

 
(18,967
)
 
1,968

Photovoltaics:
 
 
 
 
 
 
 
 
 
 
 
 
   Patents
 
1,528

 
(1,528
)
 
—

 
1,972

 
(1,781
)
 
191

Total
 
$
22,463

 
$
(21,321
)
 
$
1,142

 
$
22,907

 
$
(20,748
)
 
$
2,159
Schedule of finite-lived intangible assets, future amortization expense
Based on the carrying amount of our intangible assets as of September 30, 2014, the estimated future amortization expense is as follows:
Estimated Future Amortization Expense
 
(in thousands)
 
 
 
Fiscal year ended September 30, 2015
$
555

Fiscal year ended September 30, 2016
554

Fiscal year ended September 30, 2017
33

Fiscal year ended September 30, 2018
—

Fiscal year ended September 30, 2019 and thereafter
—

Total
$
1,142