Pigtail style collimator for 1550nm with an f=4.5mm aspheric lens in an 8mm OD housing with 60dB return loss, with a 1 meter long, 0.9mm OD hytrel jacketed, 8/125µm PM fiber terminated with an angle polished FC/APC connector. The collimated beam diameter will be about 0.9mm at the 1/e^2 level.
