Photonics stocks have exploded over the last year

The Photonics industry has been the most impressive over the past year:

• $LITE +1621%
• $AAOI +1434%
• $COHR +529%
• $CRDO +377%
• $VIAV +353%
• $FN +281%
• $MTSI +189%
• $MRVL +186%
• $IPGP +136%
• $POET +127%

Are we still in the 'early stages' of this industry boom… or have investors gotten greedy?