The current edition of focus is the (covering optical electronics in modern communications), though the 5th and 4th editions are still widely circulated. The manual typically covers hundreds of problems ranging from basic waveguide modes to complex coupled-mode theory calculations.
While physical copies were originally produced for instructors, digital versions are frequently discussed in academic circles. Solutions Manual Photonics Yariv
Understanding why students seek out this PDF is key to appreciating its value. The current edition of focus is the (covering
(YARIV) - Photonics - Optical Electronics in Modern ... - Scribd Solutions Manual Photonics Yariv