研究目的
To demonstrate the generation of a single-sideband orthogonal frequency division multiplexed (OFDM) signal using an on-chip silicon photonics microring-based IQ modulator and its transmission over 20 km of standard single-mode fiber.
研究成果
The experiment successfully demonstrated the generation of a wideband optical SSB-OFDM signal over a 15.7 GHz bandwidth with a 2.7 GHz guard band using an integrated silicon microring IQ modulator. The side-band suppression ratio was over 18 dB, and the signal was transmitted over 20 km of SSMF with a raw data rate of 31.3 Gb/s. This subsystem provides a low-cost integrated solution for SSB signal transmitters and is compatible with WDM without additional equipment.
研究不足
The OSNR is limited by the poor electrical signal quality due to suboptimal cascaded amplifiers. The performance could be improved with a higher output power DAC or low-noise RF amplifiers. The MRMs' inherent frequency selectivity imposes a frequency roll-off on the modulated signal, limiting the bandwidth.
1：Experimental Design and Method Selection:
The experiment involves the use of a silicon microring IQ modulator to generate an optical SSB signal for a direct detection system. The methodology includes the design and characterization of the microring IQ modulator, generation of the SSB-OFDM signal, and its transmission over 20 km of standard single-mode fiber.
2：Sample Selection and Data Sources:
The experiment uses a microring IQ modulator designed on the silicon-on-insulator (SOI) platform. The data is generated off-line in Matlab, mapped to QPSK and OFDM coded, and then fed to a digital-to-analog converter (DAC).
3：List of Experimental Equipment and Materials:
The equipment includes a Cobrite external cavity laser, a digital-to-analog converter (DAC), RF amplifiers, an EDFA, a tunable optical band pass filter (OBPF), a variable optical attenuator (VOA), and a real-time oscilloscope (RTO).
4：Experimental Procedures and Operational Workflow:
The experimental setup involves tuning the laser to a specific wavelength, generating the OFDM signal, amplifying the driving signals, modulating the signal using the microring IQ modulator, amplifying the chip output power, filtering the signal, transmitting it over 20 km of SSMF, and detecting the signal.
5：Data Analysis Methods:
The performance is evaluated based on the sideband suppression ratio, bit error rate (BER), and signal-to-noise ratio (SNR) per subcarrier.
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