LiDAR systems and methods for detecting objects in a region of interest (ROI) comprising: a radiation source for emitting an output beam at a pre-determined wavelength towards the ROI; a detection system for detecting an input beam from the ROI, the detection system including: a return optical fiber configured to capture the input beam, the input beam including a desired portion having a wavelength corresponding to the pre-determined wavelength of the output beam, and a noise portion having wavelengths outside of the pre-determined wavelength, the return optical fiber including: a Fiber Bragg Grating for filtering the input beam to separate the desired portion of the input beam from the noise portion of the input beam; and a single broadband detector for receiving the desired portion of the input beam.