Abstract
A simultaneous frequency up conversion of four intermediate frequency (IF) signals is carried out by utilizing a semiconductor optical amplifier Mach–Zehnder interferometer (SOA-MZI) in a differential configuration for radio over fiber applications. A sampling signal compelled by an optical pulse clock source produces 10-ps-width pulses at a repetition rate domain that is from 7.8 to 19.5 GHz. The four IF signals carrying quadratic phase shift keying (QPSK) data at frequencies fm are up converted at the SOA-MZI output at mixing frequencies nfsk ± fm, where k and m equal 1, 2, 3, and 4 and n is the harmonic rank of the sampling signal. The simulation study for simultaneous frequency up conversion relied on the SOA-MZI sampling mixer is developed to acquire the conversion gain and the error vector magnitude (EVM) in the repetition rate range. Using the virtual photonics integrated simulator, we show that incrementing the repetition rate from 7.8 to 19.5 GHz improves the competence and merit of the optical transmission system due to a better signal level and a lower aliased noise power with a higher sampling rate. Positive conversion gains were achieved at a higher mixing frequency for each channel. Concomitantly, the benefit on the conversion gain provided by augmenting the sampling frequency is 14 dB. By increasing the repetition rate, the EVM can be ameliorated up to 12% for all channels. In addition, it degrades more when the frequency channel increases over the repetition rate range. The maximum bit rate of 25 Gbit / s with a QPSK modulation meets the forward error correction limit.
Highlights
Radio over fiber (RoF) systems for the mixing function based on optical devices offer features including a weight decrease of heavy electrical cables, the use of a local oscillator (LO), and a vast bandwidth
The fundamental novelty in this work lies in adding a sampling method in a semiconductor optical amplifier Mach–Zehnder interferometer (SOA-MZI) used in the virtual photonics integrated (VPI) simulator to obtain simulation frequency up conversion, which is explained in the new principle, for four intermediate frequency (IF) signals with very good performance of the optical transmission system
Frequency up conversion of quadratic phase shift keying (QPSK) data carried by the electrical subcarrier at the electrical port of optical Mach–Zehnder modulators (MZMs) is evaluated for different bit rates (BRs) at the maximum mixing frequency
Summary
Radio over fiber (RoF) systems for the mixing function based on optical devices offer features including a weight decrease of heavy electrical cables, the use of a local oscillator (LO), and a vast bandwidth. A semiconductor optical amplifier Mach–Zehnder interferometer (SOA-MZI), used as a sampling mixer to accomplish frequency mixing in standard and differential modes,[11,12] is an integrated all-optical switch. The SOA-MZI differential configuration displays preferable performance, such as a conversion gain, compared with the SOA-MZI standard configuration.[11] In this paper, four IF signals at different frequencies are simultaneously up converted at mixing frequencies nfsk Æ fm at the SOA-MZI output using a virtual photonics integrated (VPI) simulator for the first time, where n stands for the harmonics order, m is the IF channel index, and k is the repetition rate order. Various sampling frequencies, spread from 7.8 to
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