By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Shares of JDS Uniphase fell sharply on Thursday after the networking company reported a disappointing outlook, but the tech sector got a boost from rallying shares of Yelp Inc.

JDS Uniphase (JDSUD) was down more than 10%, triggering the Nasdaq's short-sale circuit breaker, after the company posted a downbeat report, highlighted by a weaker-than-expected guide.

On the other hand, Yelp (YELP) shares jumped more than 13% after the company posted better-than-expected financials.

RBC Capital's Mark Mahaney upgraded the stock to outperform from sector perform, citing "fundamental trends remaining very robust, a series of identifiable growth gap-up opportunities and clear strategic value."

The Nasdaq Composite Index (RIXF) gained 0.4% to 4,131. The Morgan Stanley High Tech 35 Index (MSH) and the Philadelphia Semiconductor Index (SOX) were each up slightly.

Gains also came from Facebook Inc.(FB), which was up more than 3%, and LinkedIn(LNKD), which gained more than 6%.

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