The present invention is related to an endoscopic system for phase imaging, comprising a multicore waveguide (080), an optical system comprising at least one first light source (002), for illuminating the sample to be examined, a first camera (010) that is provided at the proximal side of the multicore waveguide (080) to capture a bright field intensity image of the sample (090) to be examined, and a processing unit (200), wherein the processing unit (200) comprises a deep neural network, preferably of the Unet-type and generative adversarial network (GAN) type, that is trained so as to provide phase images. The present invention is related to a method using said endoscopic device.