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Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2013
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 December 31, 2013
 
As of September 30, 2013
 
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Assets
 
Gross Assets
 
Accumulated
Amortization
 
Net
Assets
Fiber Optics:
 
 
 
 
 
 
 
 
 
 
 
 
   Core Technology
 
$
12,727

 
$
(11,928
)
 
$
799

 
$
12,727

 
$
(11,822
)
 
$
905

   Customer Relations
 
3,511

 
(2,719
)
 
792

 
3,511

 
(2,647
)
 
864

   Patents
 
4,697

 
(4,527
)
 
170

 
4,697

 
(4,498
)
 
199

 
 
20,935

 
(19,174
)
 
1,761

 
20,935

 
(18,967
)
 
1,968

Photovoltaics:
 
 
 
 
 
 
 
 
 
 
 
 
   Patents
 
1,972

 
(1,828
)
 
144

 
1,972

 
(1,781
)
 
191

Total
 
$
22,907

 
$
(21,002
)
 
$
1,905

 
$
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 December 31, 2013, the estimated future amortization expense is as follows:
Estimated Future Amortization Expense
 
(in thousands)
 
Nine months ended September 30, 2014
$
763

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 and thereafter
—

Total
$
1,905