Virtual Log Files (VLFs) Fragmentation
VLF are totally managed internally by SQL server, I am talking about there size. If you have large amount of VLF's for the database its not a good sign.I guess you are referring to large amount of VLF as VLF fragmentation.
High amount of VLF can be attributed to fact that autogrowth settings are not proper for database may be very small and database has to allocate new vlf reach times it grows. Ofcourse VLF size would be small and eventually be many. 160 VLF count does not seems issue to me.Below blog will help you in further understanding

http://www.sqlskills.com/blogs/kimberly/transaction-log-vlfs-too-many-or-too-few/