I wouldn't say its closer than we think. For one thing, in my copy of SR3 on one of the tables in "And So it Came to Pass..." it says that the first optical chip was produced in 2003, and someone (can't remember who) made on last year. Also, even though they can be produced, it will be some time (maybe 25 years

) before they become mainstream technology. After all, they need to refine the production, make optical motherboards, optical memory, and make all the components and peripherals optronic (I prefer that word to "photonic") before we get to the pure optical computers of SR. ASIST would also help considerably (but we're close on that too).