Tannersfriend: … with a 10Gb/s link, a copper interconnect will consume 10W, while silicon photonics or VCsELs solutions will consume 0.2W.

10 W seems too high, at least compared to what POET says in its White Paper, although they didn't measure themselves, but rather quote from another source:

• "According to one presentation at the 2013 OFC conference, the average power consumption from a 10 gigabit per second copper PHY is around 3W; this can perhaps be reduced to 1.5W using an active copper link with power control. Compare this with a fiber optic transceiver (using a short wavelength VCSEL source over multimode fiber) which comes in at only 15mW (at 1.5pJ/bit)."