A11 Controller voiced concern regarding the new Optimal Profile Descent (OPD) procedures recently implemented noting the variable altitudes charted allow for overtake situations.

Narrative

Both aircraft were flying the PORTJ One Arrival. The facility and regional management were advised at a users meeting; prior to implementation; that the variable altitudes on the arrival would allow for losses of separation due to varying strong winds aloft. It didn't take long to come to pass. The MD11; whose company isn't as concerned about turbulence; was about 5;000 FT lower and 60 KTS slower than the B737; whose company is very concerned about turbulence over Turnagain Arm east of Anchorage. The aircraft were accepted from Anchorage ARTCC with about 8 miles in-trail plus the overtake. The B737 was assigned interim altitudes in order to prevent a loss of separation. This procedure will not work safely with the optional altitudes at which aircraft can fly east of Anchorage. Recommendation: prohibit the use of all Optimal Profile Descent Procedures (OPD's) that involve Anchorage TRACON- PORTJ One; NEELL One; and KROTO One; until the procedures can be safely implemented again at some time in the future.