An enlargement of simultaneous active users in spectrally encoded optical CDMA network using the suppression of excess intensity noise

摘要

We demonstrate an enlargement of simultaneous active users in spectrally encoded optical code-division multiple-access (OCDMA) networks. It is shown that the excess intensity noise of a modulated incoherent signal, which limits the simultaneous active users, can be suppressed by using the gain-saturated semiconductor optical amplifier. Also, it is shown that we can suppress the EIN of superposed encoded signals in OCDMA network by using only one SOA. We expect that with suppressing the intensity noise, the one-dimensional spectrally encoded OCDMA network can accommodate around 57 and 198 simultaneous active users at the data rates of 1 Gbps and 100 Mbps, respectively.