By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks put in a round of gains Thursday, adding to the previous day's advance as most sector leaders rose and optical-networkers flexed some muscle following the earnings results of Finisar Corp.

The Nasdaq Composite Index (RIXF) rose almost 19 points to 2,568, while the Philadelphia Semiconductor Index (SOX) rose more than 1%.

Finisar (FNSR) shares rose $1.61, or more than 8%, to $21.40, after the company late Wednesday reported a fiscal second-quarter profit of $33.8 million, or 39 cents a share, on revenue of $241 million. The results turned around from a loss of $31.5 million, or 49 cents a share, on $145.7 million in sales in the same period a year ago.

Finisar makes receivers and transmitters used by the likes of Hewlett-Packard Co. (HPQ) and Cisco Systems Inc. (CSCO). The company also forecast a third-quarter profit of 45 cents to 47 cents a share on revenue in a range of $247 million to $262 million.

Spurred on by reaction to Finisar's results, other optical-networkers rose. JDS Uniphase Corp. (JDSUD) shares rose 41 cents, or 3.4%, to $12.54; Oclaro Inc. (OCLRD) climbed by 59 cents a share, or almost 6%, to $10.75 and Infinera Corp. (INFN) edged up by 8 cents to $8.32 a share.

Among other tech stocks, chipmaker Atmel Corp. (ATML) rose 41 cents, or 4%, to $11.17 after Collins Stewart initiated its coverage on the company with a buy rating.

Micron Technology Inc. (MU) rose 30 cents a share, or 4%, to $7.69 and gains also came from Microsoft Corp. (MSFT), Apple Inc. (AAPL), Google Inc. (GOOG), Hewlett-Packard Co. (HPQ) and Cisco Systems Inc. (CSCO).

 
 
 
 
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