The stock behaved predictably given the news release. I would guess some would be surprised of how many who post here sold some shares today, hoping to buy back at a lower price. Part of what was holding the share price where it had been was the uncertainty of the timing of release of good news re VCSEL. Looks like anytime soon has been eliminated per the NR, so one sells and then buys back later on. Nothing at all wrong with that, in fact, it gave people like Mazan the opportunity to buy shares for what they feel is a discounted price.
But I freely admit that it's no fun looking down my list of stocks, seeing small reds and greens and then hit a GIANT RED, about 3/4 of the way down!