Femtosecond code-division multiple-access system with 1.3 μm Cr:forsterite laser

There is increasing interest in utilizing optical code-division multiple-access (CDMA) schemes in fiber-optic local area networks because of its wide bandwidth, high information security, and the capability for multiple access. Both synchronous and asynchronous optical CDMA system have been actively studied. In general, the numbers of subscribers and the simultaneous users are larger in the synchronous CDMA although the system is more complex. However, a femtosecond CDMA scheme based on spectral encoding and decoding, which is categorized as an asynchronous scheme [1], can allow a large number of simultaneous users. [2] In this paper, we demonstrate the femtosecond code-division multiple-access based on spectral encoding of 1.3 μm Cr:forsterite laser.