31. Commonly used classes of semiconductor laser transmitters used in fiber optics include DFB ( Distributed Feed Back ). 32. SDL, which makes semiconductor lasers and other products, is one of Spectra-Physics Laser's competitors listed in the filing. 33. To explain the actual operation of semiconductor lasers , one must refine this analysis by systematically including the Coulomb-interaction effects. 34. Semiconductor lasers reach some 100 m, but small, inexpensive semiconductor lasers have coherence lengths on the order of 1 mm. 35. The new device replaces the foot-long ( 30-centimeter-long ) wiring with optical fiber and delivers the electricity via semiconductor laser . 36. The same technology might also be used to make blue semiconductor lasers , which are similar in structure but more complex. 37. Semiconductor lasers reach some 100 m, but small, inexpensive semiconductor lasers have coherence lengths on the order of 1 mm.38. J . C . Simon, " InGaAsP semiconductor laser amplifiers for single mode fiber communications ", IEEE J . of Lightw. 39. Vertical cavity surface-emitting lasers ( VCSELs ) are semiconductor lasers whose emission direction is perpendicular to the surface of the wafer. 40. In contrast, a conventional in-plane semiconductor laser entails light propagation over distances of from 250 �m upward to 2 mm or longer.
