We propose a flexible dual-pattern communication system based on the existing intensity modulation and direct detection system, which exploits the wavelength tuning characteristic of the distributed Bragg reflector (DBR) laser. At the transmitter side of the system, the DBR laser is wavelength tuned by the wavelength coding signal and intensity modulated by the radio frequency (RF) signal. At the receiver side, the RF signal is detected directly by photodetector 1, while the wavelength coding signal is recovered by a specific optical filter. The proposed system is theoretically analyzed and verified at the C band experimentally. We successfully obtained clear eye openings for the 10- and 25-Gb/s nonreturn-to zero signal. The waveform graphs of the 10- and 100-kHz wavelength coding signal were also measured. The two transmission patterns did not interfere with each other no matter in the back-to-back or 5 km case.
With the improvement of information transmission rate and the progress of semiconductor process technology, Lithium Niobite on insulator (LNOI) electro-optic modulators have received more and more attention. The LNOI modulators have high linearity and extinction ratio that silicon-based modulators do not reach, so it can be used to support high-speed and long-distance optical communication. In the LNOI modulator, the traveling wave electrodes with coplanar waveguides (CPWs) structure are used. We mainly consider the impedance matching of microwave transmission, the velocity and loss of microwave and optical wave to obtain high-speed modulation devices. By means of Simulation, we get the optical waveguide single-mode condition and analyze the characteristic impedance, microwave effective refractive index and 3dB bandwidth of the electrode under that condition. The electrode with bandwidth of 70GHz and 𝑆11 about -25dB is obtained.
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