AN ACR B747-100 FLC RPTS ENCOUNTERING SEVERAL JOLTS THAT THEY INTERPRETED TO BE WAKE TURB BASED ON PAST ENCOUNTERS; BUT WHEN THEY QUESTIONED THE ARTCC CTLR ABOUT PRECEDING TFC; HE WOULD NOT RESPOND.

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WE DEPARTED LFPO TO JFK AT APPROX AM30 LCL IN A B747-100. SHORTLY AFTER REACHING INITIAL CRUISE ALT OF FL310; A FEW MI E OF L'ENGLE VOR; WE ENCOUNTERED 2 OR 3 SHARP VERT WIND (?) GUSTS; APPROXIMATING MODERATE TO SEVERE CHOP. THERE WAS NO OTHER TFC IN SIGHT. WE HEARD NO OTHER TFC IN THE AREA (SPEAKING ENGLISH; AT LEAST -- OFTEN OTHER AREA TFC WILL SPEAK IN FRENCH -- WHO KNOWS WHERE OR WHAT THEY ARE DOING!) AND THE AIR WAS CALM; RIDE SMOOTH. ATC DID NOT ALERT US TO ANY OTHER TFC. THE TURB WAS CONSISTENT WITH WAKE TURB. NO CORRECTIVE ACTION WAS REQUIRED. OUR GROSS WT AT THE TIME WAS APPROX 695000 LBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IS A CAPT ON A B747-100 AND HE WAS CRUISING AT FL310 WHEN HIS ACFT ENCOUNTERED A SERIES OF STRONG JOLTS. HE THINKS THAT HE HIT AS MANY AS 3; BUT PROBABLY LESS THAN 5; OF THESE JOLTS AND HE FELT THAT THEY WERE THE RESULT OF FLYING THROUGH SOME ACFT'S WAKE. HE ASKED THE LFFF ARTCC CTLR; BUT THE CTLR WOULD NOT RESPOND TO HIS QUESTIONS. THE RPTR ALLEGED THAT THIS IS NOT UNUSUAL IN THIS CTL AREA. HE SAID THAT THE JOLTS WERE SIMILAR TO PREVIOUS WAKE ENCOUNTERS HE HAS EXPERIENCED. THE RPTR REQUESTED COPIES OF THE ASRS'S STRUCTURED WAKE TURB CALLBACK RPTS.