In this talk, the multi-core fiber Bragg gratings (MCFBGs) is introduced and it is shown how they can be used in the astronomical purpose. Furthermore, the current status of the MCFBG development will be presented. Fiber Bragg gratings (FBGs) are the most compact and reliable method of suppressing atmospheric emission lines in the infrared for ground-based telescopes. Standard single core FBG based filters (GNOSIS) were demonstrated in AAT to eliminate 63 OH lines in 2011 and in . Inscribing FBGs on multi-core fibers offers advantages. Compared to arrays of individual single mode fibers (SMFs), the multi-core fiber Bragg grating (MCFBG) is greatly reduced in size, resistant to damage, simple to fabricate, and easy to taper into a photonics lantern. AAT and the University of Sydney are developing the next generation of GNOSIS (PRAXIS). In addition, I would like to briefly introduce various instruments for the astronomical purpose in Astrophotonics group of AAO and the University of Sydney including an optical angular momentum (AOM) measurement as well as a microspectrograph (NanoSpec), which is the world’s first photonics-based spectrograph and have been developed to be shipped in a micro-satellite (i-Inspire). The i-Inspire has been tested in a weather balloon in 27 km altitude in 2012 and will be launched. The arrayed-waveguide-grating (AWG) based filter development will also concisely be presented.