Provided is an electrophotographic photosensitive member, including: a support; and a photosensitive layer formed on the support, in which a surface layer of the electrophotographic photosensitive member contains a polymerized product of a compound represented by the following structural formula. A waffle-type light-coupling grating having a pattern of etched wells operates to improve absorption by preventing photons from bouncing out of the detector sensing areas. Each of the plurality of computed frequency error values may be derived from a current symbol, a corresponding previous symbol, andor a previous frequency error value. The one or more tabs are sized to fit over and removably couple to a heat producing device.