Systems and methods for configuring a specific-use computing system are disclosed. Further, an output port formed from a fundamental mode waveguide is provided at the other end of the multimode waveguide. The invention also relates to a method for detecting an analyte. A relationship is assigned to each credit limits on a first plurality of tenors wherein credit extended on one of said tenors reduces the available credit on said other tenors, said credit being reduced in proportion to said preassigned proportions.