Sub-centimeter endoluminal receiver coils dedicated to MRI are the best candidates for early depiction of colonic diseases. Nevertheless, the clinical use of these coils is controversial because the impossibility of using devices such as RF traps can cause strong local heating3. Besides, the sensitivity of a single-loop coil is orientation-dependent with respect to the magnetic field4. Our overall objective is to develop a fully-optical multichannel endoluminal coil ensuring patient safety, while achieving high signal-to-noise ratio (SNR) and better radial uniformity. Optical transmission of the NMR signal combining active optical detuning could be a secure alternative solution. Here we present an optical-based circuit for simultaneous detuning of two channels/loops endoluminal coil.