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We demonstrate for the first time, a new type of aperiodic phase mask (APM)for fabricating multi-channel aperiodic fiber Bragg gratings. The mask is madeof individual diffraction phase gratings with discrete unequal phase-stepsincorporated at periodic locations. The diffraction at the discrete phase-stepsin the phase mask produces corresponding half phase-steps at periodic locationsalong the fiber. The accumulated phase, along with index modulation, generatesthe desired multinotch reflection spectrum. Complex fiber Bragg grating filtersfabricated using APM, in a standard phase mask based fabrication setup, can beused to simultaneously suppress multiple aperiodic OH emission wavelengths innear infrared (NIR) existing in upper atmosphere, and increase the sensitivityof ground based telescopes.

Aperiodic phase masks for inscribing complex multi-notch OH-emission filters for astronomy