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Segment and Revenue Information
 12 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Segment and Revenue Information Segment and Revenue Information
Reportable Segments

Reported below are the Company’s segments for which separate financial information is available and upon which operating results are evaluated by the chief operating decision maker, the Chief Executive Officer, to assess performance and to allocate resources. We do not allocate sales and marketing or general and administrative expenses, or interest expense and interest income to our segments, because management does not include the information in its measurement of the performance of the operating segments. Also, a measure of segment assets and liabilities has not been provided to the Company's chief operating decision maker and therefore is not shown below.

Information on reportable segments utilized by the chief operating decision maker is as follows:
(in thousands)For the Fiscal Year Ended September 30,
202120202019
Revenue
Aerospace and Defense$50,838 $55,240 $33,086 
Broadband107,606 54,888 54,179 
Total revenue$158,444 $110,128 $87,265 
Segment income (loss)
Aerospace and Defense gross profit$13,705 $16,729 $9,207 
Aerospace and Defense research and development expense14,616 17,469 10,448 
Aerospace and Defense segment loss$(911)$(740)$(1,241)
Broadband gross profit$47,783 $18,853 $5,882 
Broadband research and development expense2,832 2,800 8,995 
Broadband segment income (loss)$44,951 $16,053 $(3,113)
Consolidated segment income (loss)$44,040 $15,313 $(4,354)
Unallocated operating expense
Selling, general, and administrative$24,544 $24,631 $32,080 
Loss (gain) on sale of assets515 (2,284)(302)
Total unallocated operating expense$25,059 $22,347 $31,778 
Operating income (loss)$18,981 $(7,034)$(36,132)

Product Categories

Revenue is also classified by major product category and is presented below:
For the Fiscal Year Ended September 30,
(in thousands)202120202019
Aerospace and Defense
Navigation and Inertial Sensing$36,539 $38,983 $23,203 
Defense Optoelectronics14,299 16,257 9,883 
Broadband
CATV Lasers and Transmitters95,255 44,457 41,150 
Chip Devices3,106 4,873 10,828 
Other Optical Products9,245 5,558 2,201 
Total revenue$158,444 $110,128 $87,265 

Geographical Concentration

The following table sets forth revenue by geographic area based on customers’ billing address:
For the Fiscal Year Ended September 30,
(in thousands)202120202019
United States and Canada$139,443 $91,205 $68,607 
Asia11,836 9,397 11,637 
Europe4,802 5,559 6,209 
Other2,363 3,967 812 
Total revenue$158,444 $110,128 $87,265 

Significant Customers

Significant customers are defined as customers representing greater than 10% of consolidated revenue. Revenue from three, three and three significant customers represented an aggregate of 70%, 57% and 55% of consolidated revenue for the fiscal years ended September 30, 2021, 2020 and 2019, respectively. The percentage from significant customers increased driven by higher Broadband revenue.

Significant portions of the Company’s sales are concentrated among a limited number of customers. The duration, severity, and future impact of the COVID-19 pandemic are highly uncertain and could result in significant disruptions to the business operations of the Company’s customers. If one or more of these significant customers significantly decreases their orders for the Company’s products, or if we are unable to deliver finished products to the customer in connection with such orders, the Company’s business could be materially and adversely affected.