Sources of non-classical light are crucial in many quantum optics and quantum information experiments. In the ideal case they should offer the same versatility as classical laser sources in terms of stability, compactness, efficiency, and wavelength tunability. I will present a compact source of photon-pairs and squeezed light based on efficient parametric down conversion in a triply resonant whispering-gallery resonator (WGR) made out of lithium niobate. The central wavelength of the emitted light can be tuned over hundreds of nanometers and allows for precise and accurate spectroscopy with heralded single photons of tunable bandwidth. Likewise optical fibres have been successfully used to generate squeezed and entangled states. I will review our work on fibre based squeezed light sources on non-resonant systems. In addition photonic crystal fibres can be used to guide light inside a hollow core that can be filled with gases. I show our experimental work that aims for generating  squeezed states by using a resonant interaction and the effect of self-induced transparency.