| 摘要 |
<p>A composite grating structure is disclosed that performs a programmed complex-valued, spectral filtering function on an input optical signal. The grating consists of a plurality of subgratings, each controlling the diffraction of a specific optical subbandwidth of light from an operative input direction to an operative output direction imparting a controllable amplitude and phase change onto the corresponding subbandwidth of light. The set of subgratings comprising the composite grating collectively controls the diffraction of an operative output direction. Each composite grating is programmed through its construction or is dynamically modified to provide a desired spectral filtering function. The composite gratings can be employed for general spectral filtering application but are especially attractive for optical waveform processing, generation, and detection.</p> |
