Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of optical networking gear maker Ciena (Nasdaq: CIEN) jumped 14.4% in early trading, surpassing the average daily volume about an hour after the opening bell.

So what: Ciena doesn't report earnings until early March, but fellow optical networker JDS Uniphase (Nasdaq: JDSU) blew the lid off its second-quarter report last night. The entire fiber-optics industry is coming along on a market joyride today.

Now what: Citing the dual growth drivers of video and mobile data services, JDSU just reignited a fiber-optics market that never really cooled down. Ciena's shares have now doubled over the last 12 months while JDSU gained 174% and Finisar (Nasdaq: FNSR) jumped even higher to a 277% gain. High-growth investors should keep a close eye on this red-hot market, particularly since Cisco Systems (Nasdaq: CSCO) predicts continued exponential growth in bandwidth demands until at least 2015.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. The Fool has created a bull call spread position on Cisco Systems. Motley Fool Alpha owns shares of Cisco Systems. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.