Super fast all optical memory and optical logic gates are the basic building blocks for optical computation and communication systems. Realization of a very fast memory cell in the optical domain is very challenging. Recently different theoretical proposals based on combinational and sequential logic circuits for developing all optical flip flops as well as memory cells have been reported by different authors. Here, the authors have proposed a new scheme of an all optical frequency encoded dibit based latch circuit using a reflective semiconductor optical amplifier and an add/drop multiplexer with its proper simulation. The use of the dibit representation technique along with the optical frequency encoding technique makes the system very fast, reduces the bit error problem, and increases the signal to noise ratio.
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