Comedian Jan Boehmermann recited a poem on television in March suggesting Erdogan engaged in bestiality and watched child pornography.
PIA offers to fly Turkish Airlines passengers following terror attack at Istanbul airport
Lawyer Michael-Hubertus von Sprenger said he had filed the complaint to a court in Hamburg and wanted to get a full injunction to replace the preliminary one as well as get sections that the court did not ban in May prohibited.
Turkish company says it will acquire Dawlance for $258m
Separately, in the western city of Mainz, preliminary proceedings against Boehmermann are underway as he is suspected of insulting a foreign leader.
The German government had given prosecutors the green light to pursue the case against Boehmermann - a move which brought Merkel strong criticism.
German-Turkish ties have been strained - both by the case and by Turkey's outrage over a resolution passed by Germany's parliament declaring the 1915 massacre of Armenians by Ottoman forces to be genocide.
That comes at a time when Germany is banking on Turkey's help in stopping the flow of illegal migrants.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ