1. An integrated imaging spectrometer, comprising: front-end optics for receiving an image of a scene, said image comprising an input spectrum having a plurality of wavelengths; an array of lenslets for receiving the input spectrum; and a plurality of planar lightwave circuits, each planar lightwave circuit coupled to a row of lenslets in the array of lenslets, wherein each planar lightwave circuit further comprises: a plurality of waveguides, each waveguide coupled to one lenslet in the row; a plurality of filters along the length of the waveguides, each filter operatively coupled to a detector for detecting a unique wavelength from the input spectrum as filtered by the filter; and processing circuitry for processing the detected wavelength.