the signal power along the first and the second optical pathways respectively and a photodetector integrated into the photonic integrated circuit and coupled to said first optical pathway for measuring a signal power level on said first optical pathway application_number US 25438008 A description the above described problems of the conventional art are solved in accordance with the method and apparatus of the present invention a novel method and apparatus for internal monitoring and fault isolation in photonic integrated circuits pics is presented before one or more embodiments of the invention are explained in detail it is to be understood that the invention is not limited in its application to the details of construction or the arrangements of components set forth in the following description or illustrated in the drawings the terms u201c construction u201d and u201c components u201d being understood in the most general sense and thus referring to and including in appropriate contexts methods algorithms processes and sub processes the invention is capable of other embodiments and of being practiced or being carried out in various ways also it is to be understood that the phraseology and terminology used herein is for the purposes of description and should not be regarded as in any way limiting to illustrate the method and apparatus of the present invention an ao2r all optical regeneration and reshaping wavelength conversion device will be used as an exemplary pic such a device is depicted in fig1 and is the subject of a pending us patent application under common assignment herewith and thus not.