Abstract
We have designed and studied a W-band OCDMA radio-over-fiber system. To increase the number of channels, optical encoding and decoding are utilized. The theoretical analysis of generation, modulation and optical encoding of a signal is presented. Also, to confirm the theoretical analysis, the transmission of the encoded signal, decoding and its detection is simulated. Two optical codes (m-sequence and quaternary phase shift) with different code lengths are used and the results are presented. Simulation results for each set of codes are compared and the performance of each code is evaluated in the final bit error rate measurements. The quaternary phase shift codes show almost 20 dB of BER gain compared to m-sequence. In addition, the number of channels that are accommodated by the quaternary phase shift codes are more than four times the m-sequence code with the same length. The stability of the system is improved by using a low-frequency sinewave generator to modulate the signal to the W-band. Also, the capacity and reach of the system are improved while the cost and complexity are reduced by eliminating the necessity of using a high-frequency sinewave generator in the modulator. This system simultaneously guarantees increased capacity and reach for a radio-over-fiber network.
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