A laser diode comprising a first separate confinement heterostructure and an active region on the first separate confinement heterostructure. By using a forward angled entry trough with a square large basin area having the attachment hooks in a forward position, the weight is put in the rear and the forward edge of the device is held forward of the end flange and tight against the lower surface of the concrete chute. Consequently, the test time can be shortened greatly. Thus, a low-frequency component of the input signal is not omitted. If none of the randomly generated number for an element fall within the given range, a reserve number may be used to indicate how many empty logic units the element should be shifted, or a retry flag if set may cause a new set of random numbers to be generated for the element at issue.