NEW YORK ( TheStreet) -- Oplink Communications (Nasdaq: OPLK) is trading at unusually high volume Friday with 947,936 shares changing hands. It is currently at four times its average daily volume and trading up $1.34 (+5%) at $28.48 as of 3:21 p.m. ET. Oplink has a market cap of $538.3 million and is part of the technology sector and electronics industry. Shares are up 46.3% year to date as of the close of trading on Thursday. Oplink Communications, Inc. designs, manufactures, and sells optical networking components and subsystems worldwide. The company has a P/E ratio of 27.9, equal to the average electronics industry P/E ratio and above the S&P 500 P/E ratio of 23.4. TheStreet Ratings rates Oplink as a buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures, solid stock price performance, impressive record of earnings per share growth and compelling growth in net income. We feel these strengths outweigh the fact that the company shows weak operating cash flow. You can view the full Oplink Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.