The layout of each LVDS pair needs special consideration.
If the distance separating the positive and negative trace is d, then the distance from the differential pair to another differential pair should be greater than 2d.
The distance from the differential pair to a GND or VCC trace should also be greater than 2d and
the distance from the differential pair to TTL signals should be greater than 4d.
about width it depend upon the stack of pcb..
8 mil for 50 ohm
generally d=8 to 10
for extra reference see the attach file..
I just found the e-book : High-Speed Signal Propagation-Advanced Black Magic
It's on e-book download section. At the first glance, I think this book could answer all my question. For the person who interest in this area, just read it.