New York ? It goes without saying that TV mogul Dick Wolf is big.

The “Law & Order” empire he built (including “Law & Order: Criminal Intent,” which airs Sundays; “Law & Order: Special Victims Unit,” Tuesdays; and their progenitor, in its 16th season, on Wednesdays) is also big. Just ask NBC, which reportedly logs as much as $1 billion in annual ad sales from “Law & Order” programming, and counts “Special Victims Unit” its highest-rated show.

But that’s not all. “Conviction,” Wolf’s drama about assistant district attorneys, is scheduled to premiere on NBC in midseason. And a series he’s developing for NBC next season would chronicle the impact of a sensational murder trial as it overtakes a small town.

Wolf has lots going on. Even so, he still feels the pain from NBC axing “Law & Order: Trial By Jury” just weeks after its premiere last March.

“Extraordinarily upsetting,” he says.

Was he really blindsided?

“More than blindsided. I had been told multiple times, ‘Yeah, the show’s coming back. What’re you worried about?”‘

But when NBC’s fall schedule was unveiled last May, “Trial By Jury” was nowhere to be found. The network had dumped it for “Inconceivable,” an aptly titled melodrama about a fertility clinic. “Inconceivable” vanished after just two airings.

What then? What else: reruns of “Criminal Intent” are filling that Friday gap, at least through November sweeps.

So much for NBC’s latest stab at reducing its dependence on “Law & Order” backups, which are routinely plugged into the network’s leaky schedule like fingers in a dike. (One notable week last season, one or another “Law & Order” series aired during 12 of NBC’s 22 prime-time hours.)

This may account for why Wolf (at 58 a veteran producer who has weathered his share of flops) takes umbrage at how the network discarded “Trial By Jury” after long benefiting from its three predecessors.

What did canceling “Trial By Jury” really say about NBC’s faith in the “Law & Order” brand?

“It was more a statement about the network and our mandate to move forward,” declares NBC Entertainment President Kevin Reilly, who cites the network’s prime-time plunge from first to fourth place last season as “a very clear sign in the ratings that it was time to move on.”

“Trial By Jury” wasn’t a breakout hit, and the network opted not to wait for it to catch on.

Asked the prospect for future “Law & Order” spinoffs, Reilly says, “We have no plans at the moment.”

But he hastens to point out: “We clearly jumped back into business with Dick.”

With just a pilot script in hand, NBC has ordered 13 episodes of “Conviction,” which Wolf created after finding this statistic: Among the hundreds of prosecutors in the Manhattan district attorney’s office, the average age is 28. This translates into young, inexperienced and attractive go-getters who are pushed to the limit. Casting is under way.

A crime-and-courts sort of drama ripped from the headlines, “Conviction” need add only a few location title cards, “cha-chung” sound effects, and yet another variation on Mike Post’s theme to qualify as “Law & Order: Conviction.” (It will even occupy the elaborate courtroom-and-offices set vacated by “Trial By Jury” at Kaufman Astoria Studios in Queens.)

But it won’t be wearing that “Law & Order” mantle.