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Segment and Revenue Information
 12 Months Ended
Sep. 30, 2022
Segment Reporting [Abstract]  
Segment and Revenue Information Segment and Revenue InformationReportable 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, 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:
Year Ended September 30,
(in thousands)20222021
Revenue
Aerospace and Defense$53,306 $50,838 
Broadband70,820 107,606 
Total revenue$124,126 $158,444 
Segment profit
Aerospace and Defense gross profit$5,357 $13,705 
Aerospace and Defense research and development expense15,543 14,616 
Aerospace and Defense segment profit$(10,186)$(911)
Broadband gross profit$24,361 $47,783 
Broadband research and development expense2,993 2,832 
Broadband segment profit$21,368 $44,951 
Total segment profit$11,182 $44,040 

Product Categories

Revenue is classified by major product category as presented below:
Year Ended September 30,
(in thousands)20222021
Aerospace and Defense
Inertial Navigation$45,318 $36,539 
Defense Optoelectronics7,988 14,299 
Broadband
CATV Optical Transmitters and Components58,488 95,255 
Data Center Chips4,814 3,106 
Optical Sensing7,518 9,245 
Total revenue$124,126 $158,444 

Geographical Concentration

The following table sets forth revenue by geographic area based on customers’ billing addresses:
Year Ended September 30,
(in thousands)20222021
United States and Canada$106,533 $139,443 
Asia8,697 11,836 
Europe6,489 4,802 
Other2,407 2,363 
Total revenue$124,126 $158,444 

Customer Concentration
Portions of the Company’s sales are concentrated among a limited number of customers. Significant customers are defined as customers representing greater than 10% of consolidated revenue. There were three and three significant customers representing an aggregate of 54.1% and 70.1% of consolidated revenue for the fiscal years ended September 30, 2022 and 2021, respectively. The percentage from significant customers decreased due to lower CATV revenue from our Broadband segment.

The duration, severity, and future impact of the COVID-19 pandemic is 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.