To provide an optical encoded signal generator and an optical code division multiplexer of simple constitution, low system costs and high performance.

The optical encoded signal generator is provided with an optical pulse signal generator for generating the optical pulse signals of a prescribed cycle and an optical encoder for performing the optical phase encoding of the optical pulse signals from the optical pulse signal generator and generating optical encoded signals. In this case, the pulse time width of the optical pulse signals from the optical pulse signal generator is larger than a chip duration in the optical phase encoding of the optical encoder.