Stefan Murry
Analyst · Raymond James
Thank you, Thompson. Total revenue for the first quarter grew 67% year-over-year to reach $50.4 million within the original guidance of $50 million to $54 million.
We continue to see strong demand for our data center products. Data center revenue in the first quarter grew to $39 million, representing growth of 139% year-over-year and ahead of our record performance last quarter. Our data center growth this quarter was primarily driven by continued 40G sales to our 2 largest data center customers. We also expanded the number of 100G shipments by 30% compared with fourth quarter.
However, as Thompson mention, we're starting to see customers push out forecast for 100G transceivers. This is due to the delay in market availability of advanced 100G chipsets required for switches and routers. Current forecasts from our customers indicate that we should expect to see strong growth for our 100G transceivers once the enhanced chipsets are more broadly available in the back half of the year.
Despite this near-term delay, longer-term customer forecasts for 100G products have remained consistent. We continue to be in active qualification with the existing and new hyperscale data center customers for other 100G products, and we continue to expect decisions to be made sometime in the first half of the year. We are particularly encouraged by results coming from one of our new hyperscale engagements, and we look forward to sharing more information about this opportunity in the future.
Turning to our CATV market. Revenue from CATV products in the first quarter was $7.7 million, down 36% year-over-year when compared with $12 million in Q1 of last year. While we had expected a sequential seasonal decline in CATV, revenue for these products was lower-than-expected due to the same dynamics we saw in Q4, which included lower international sales, especially in Latin America, and consolidation among our CATV customers in the U.S. As Thompson mentioned, this was our lowest CATV revenue in many years, but fundamental demand began to improve as we exited the quarter. While we believe Q1 to be the bottom for CATV, please recall that in Q2 of 2015, we had very strong demand from Latin America, and thus, we are facing a stiff comparable quarter last year, and we expect to see a year-over-year decline in CATV revenue compared to the same quarter last year.
We continue to believe DOCSIS 3.1 will be a significant growth catalyst for our CATV business, and widespread deployment is expected to begin in mid-2016. Ahead of this demand, at the end of Q1, we began to see a resumption in normal order flow from one of our CATV customers, who had previously slowed markedly. As the CATV market leader, we believe AOI remains very well positioned to capture a significant portion of the DOCSIS 3.1 infrastructure spend directed towards node and head-end replacement.
Revenue for our FTTH segment came in at approximately $421,000. Revenue in this segment is expected to continue to fluctuate quarterly in the $0.1 million to $2 million range in the near-term. Our telecom segment delivered revenue of $3.1 million, up 80% year-over-year, driven by recent design wins with several of our telecom customers. For the quarter, 77% of our revenue was from data center products, 15% from CATV products, with the remaining 8% from FTTH, telecom and other. In the first quarter, we had 2 10% or greater customers in the data center business that contributed 52% and 25% of total revenue.
Moving down the income statement. Q1 total gross margin was 28.3%, a decrease of 120 basis points when compared with the 29.5% reported in Q4 of 2015 and a decrease of 490 basis points from the 33.2% reported in Q1 of last year. Our consolidated Q1 gross margin was primarily impacted by lower-than-expected yields as we ramped new capacity and trained new staff for certain long-reach 40G and 100G light engines. During the quarter, we experienced a higher-than-expected turnover in production line workers in our Ningbo, China factory. While in the first quarter, we always expect to see a seasonally higher level of turnover in China because of the lunar New Year, the turnover this first quarter was double what we normally see. As a result, we experienced lower-than-expected yields and longer manufacturing times as we brought in and trained new production line workers. I would like to reiterate that despite these operational challenges, there was no impact to our customers, and we fulfilled customer requirements for the quarter.
The activities we undertook to simplify and automate more of the manufacturing process for light engines along with the design activity for our cost-reduced 100G transceivers caused our R&D expense to increase in the quarter by approximately $2.2 million. We expect these investments to yield improved yields and lower manufacturing costs. We also believe these investments will help enable us to maintain our cost leadership in 100G products, even with anticipated volume-driven price reductions in the future. In total, R&D expense was $8.3 million or 16.4% of revenue compared with $5.9 million or 11.1% of revenue in the prior quarter. Sales and marketing expense was $1.6 million or 3.2% of revenue, in line with the $1.6 million or 3% of revenue in the prior quarter.
G&A expense was $4.9 million or 9.7% of total revenue and increased slightly from $4.5 million or 8.5% of revenue in Q4 of last year. The increase in G&A was mostly from annual compensation increases and additional headcount added in Q1. This brings total operating expenses in the first quarter to $14.8 million or 29.3% of revenue, up approximately $2.8 million when compared with $12 million or 22.6% of revenue in the prior quarter with the majority of the increase in R&D.
On a year-over-year basis, total operating expense as a percent of revenue decreased by 510 basis points compared with the first quarter of 2015. Non-GAAP operating loss in Q1 was $0.5 million compared with operating income of $3.6 million in the prior quarter and operating loss of $0.3 million in Q1 of last year. Non-GAAP net loss after tax for the first quarter was $0.6 million compared with net income of $3.9 million in the prior quarter and $0.3 million in Q1 of last year. We reported a non-GAAP net loss of $0.04 per share compared with non-GAAP net income of $0.22 per diluted share in the prior quarter and $0.02 in Q1 of last year. GAAP net loss for Q1 was $1.3 million or $0.08 per share compared with GAAP net income of $2.7 million or $0.15 per share in the prior quarter. The Q1 weighted average basic share count was approximately $16.9 million.
Turning now to the balance sheet. We ended Q1 with $58.5 million in total cash, cash equivalents, short-term investments and restricted cash compared with $40.7 million at the end of the previous quarter. Accounts receivable decreased to $34.9 million compared with $38.8 million last quarter, and accounts payable decreased approximately $3.6 million over Q4. We made a total of $16.9 million in capital investments in the quarter, including $7.6 million in production, equipment and machinery and $8 million on construction and building improvements, mostly for our new production facility in Sugar Land. As of March 31, we had $60.3 million in inventory, a decrease of approximately $6 million from Q4. The decrease in inventory is due to improved supply chain management procedures that were implemented over the last several quarters.
Moving to our outlook. We expect Q2 revenue to be between $49.5 million and $52 million, representing flat to 5% year-over-year growth. We expect Q2 non-GAAP gross margin to be in the range of 29.5% to 31%. Non-GAAP net income is expected to be in the range of $0.7 million to $1.5 million and non-GAAP EPS between $0.04 per share and $0.08 per share, using a weighted average fully diluted share count of approximately 17.9 million shares.
With that, I will turn it back over to the operator for the Q&A session. Operator?