A fiber optic recirculating memory comprises a splice-free length of optical fiber which forms a loop that is optically closed by means of a fiber optic coupler. The coupler couples an optical signal input pulse to the loop for circulation therein, and outputs a portion of the signal pulse on each circulation...http://www.google.de/patents/US4815804?utm_source=gb-gplus-sharePatent US4815804 - In-line fiber optic memory and method of using same
