Sensitivity to faint targets is determined not only by the amount of light captured by the telescope (which scales with the area of the telescope's primary mirror, the "light bucket"), but also the level of unwanted noise from the sky and detector. Our unique approach relies on reducing the sky noise by a factor of ~40-60 using ultra-broadband Fiber Bragg gratings (FBGs). These gratings are fabricated by imposing periodic variations of the refractive index along individual fibers. Small but in phase Fresnel reflections take place at each boundary and result in filtering out more than a thousand OH sky lines in the near-infrared window (~1000-1800 nm) before dispersion. These FBGs are by far the most sophisticated astronomical filters ever made.