You are given a text that consists of multiple sentences. Your task is to perform abstractive summarization on this text. Use your understanding of the content to express the main ideas and crucial details in a shorter, coherent, and natural sounding text. 
Text: With me on the call today are Seamus Grady, Chief Executive Officer; and Csaba Sverha, Chief Financial Officer.
We had a strong start to fiscal 2022 with top and bottom line results for the first quarter that exceeded our expectations.
Demand trends remain robust across our business, which contributed to revenue reaching $543.3 million, more than $13 million above the high end of our guidance.
We continue to execute very effectively with revenue upside falling to the bottom line as reflected in our non-GAAP net income of $1.45 per share, which was also above our guidance range.
From a revenue perspective, we had a particularly strong quarter for optical communications, which grew 10% from the fourth quarter and 24% from a year ago.
As Csaba will detail in a moment, strong optical communications demand was evident in both telecom and datacom.
We continued to execute well despite the component supply constraints that we and many others continue to experience.
During our last call, we estimated that we would see a $25 million to $30 million revenue headwind in the first quarter from these constraints.
We are pleased to report that the actual impact was at the lower end of that range.
Our ability to overcome many of these component charges was most evident in our record optical communications results.
Component charges in the automotive markets' extremely lean supply chain resulted in a moderate decline in automotive revenue from the fourth quarter.
As we look to the second quarter, we are optimistic about continued strong demand across our business and are anticipating healthy overall growth despite persisting supply chain headwinds.
Operationally, I'm very happy to announce that our COVID-19 vaccination program for employees in Thailand has been a great success and that, at this point, 99% or virtually all of our employees in Thailand are now fully vaccinated.
I'm also pleased that we were successful in delivering first quarter margins within our target ranges despite these additional COVID-19 related costs in the quarter.
At our Chonburi campus, construction of our second building is progressing well.
This building will add approximately 1 million square feet or 50% to our global footprint, substantially increasing our manufacturing capacity.
We are on-track for construction to be completed around the end of the fiscal year.
This schedule is extremely timely since based on continued customer demand, we now anticipate that our first building in Chonburi will be effectively fully occupied when our second Chonburi building opens for business.
In summary, after a very strong first quarter, we are optimistic that Q2 will represent another strong quarter for revenue and profitability.
Demand trends remain strong, and we are excited that our second building in Chonburi will be coming online just at the right time to enable us to continue meeting anticipated demand and extend our business momentum in the years ahead.
We are off to a great start for the fiscal year with record revenue and non-GAAP profitability in the first quarter.
Revenue of $543.3 million was well above our guidance and represented an increase of 7% from the fourth quarter and 24% from a year ago.
As we continue to execute very efficiently, our top line outperformance fell to the bottom line, with non-GAAP earnings of $1.45 per diluted share, which also exceeded our guidance.
This result includes approximately $0.05 per share in foreign exchange gains, offsetting the expenses related to our vaccination program that we incurred in Q1.
Looking at the quarter in more detail.
Optical communications revenue was $427.3 million, up 10% from the fourth quarter and made up 79% of total revenue.
Within optical communications, telecom revenue increased 9% from the last quarter to $338.6 million, a new record, and datacom revenue of $88.7 million increased 15% from Q4.
By technology, silicon photonics products reached a record $135.1 million or 25% of total revenue and was up 23% from the fourth quarter.
Revenue from products rated at speed of 400 gig or higher was $173.3 million, up 30% from the fourth quarter and 149% from a year ago.
Revenue from 100 gig product increased modestly from Q4 to $135.6 million.
Based on continue strong demand, we are expecting to see strong sequential growth in optical communications in the second quarter.
Nonoptical communications revenue was $116 million or 21% of total revenue, representing a 25% increase from a year ago, but a decrease of 5% from the fourth quarter.
While as Seamus noted, the overall impact of component shortages was at the lower end of our expectations for the quarter, these constraints were more apparent for nonoptical products, especially in automotive.
With the majority of our sensor revenues serving automotive applications, we are now reclassifying automotive revenue and other nonoptical communications revenue to include historical sensor revenue, which has represented less than 1% of quarterly revenue for the past two years.
On this combined basis, automotive revenue was $48.2 million, a decrease of 8% from last quarter.
While we don't intend to break this out in the future, for a more direct comparison purposes, automotive revenue, excluding sensors, declined 8% sequentially.
Industrial laser revenue was $37.5 million, a decline of 9% from Q4, but stable when viewed on a trailing 12-month basis.
Other nonoptical communications revenue was $30.3 million, up 7% from the fourth quarter.
This category now includes a portion of revenue that was previously classified as sensors.
Now turning to the details of our P&L.
Gross margin was 12.1%, down 20 basis points from Q4, consistent with our expectation, considering the expenses related to our vaccination program annual merit increases.
Operating expenses in the quarter were $13.2 million or 2.4% of revenue, resulting in operating income of $52.5 million or 9.7% of revenue.
Effective tax rate was 1.2% in the first quarter, and we continue to anticipate that our tax rate in the fiscal year 2022 will be approximately 3%.
Non-GAAP net income was a record at $54.2 million or $1.45 per diluted share.
On a GAAP basis, net income was $1.20 per diluted share.
Turning to the balance sheet and cash flow statement.
At the end of the first quarter, cash, restricted cash and investments were $528.6 million, compared to $548.1 million at the end of the fourth quarter.
Operating cash flow was $39 million.
With capex of $34.6 million, free cash flow was $4.4 million in the quarter.
We did not repurchase any shares during the first quarter.
We remain committed to return surplus cash to shareholders through a 10b5-1 share repurchase plan, combined with opportunistic open market share buybacks.
Currently, we have $81.2 million in our share repurchase authorization.
Now I would like to turn to our guidance for the second quarter of fiscal year 2022.
After a strong start to the year, we are optimistic that our momentum will continue in the second quarter.
We expect strong top line growth despite similar revenue headwinds from component shortages that we experienced in the first quarter.
We estimate that the ongoing supply cost change will again impact our second quarter revenue by approximately $25 million to $30 million.
With that backdrop, for the second quarter, we anticipate revenue in the range of $540 million to $560 million.
From a profitability perspective, we anticipate non-GAAP net income to be in the range of $1.42 to $1.49 per diluted share.
In summary, we are off to a great start to the year, and we are optimistic that strong demand trends and execution will combine again to produce even stronger results in the second quarter.

user
compname says revenue for first quarter of fy22 was $543.3 million, compared to $436.6 million in first quarter of fy21.
revenue for the first quarter of fiscal year 2022 was $543.3 million, compared to $436.6 million in the first quarter of fiscal year 2021.
gaap net income per diluted share for the first quarter of fiscal year 2022 was $1.20.
non-gaap net income per diluted share for the first quarter of fiscal year 2022 was $1.45.
expects second quarter revenue to be in the range of $540 million to $560 million.
non-gaap net income per diluted share is expected to be in the range of $1.42 to $1.49 in q2.

assistant