Nonlinear Optical SiC:C Microring for an ASK-to-PSK Gate and NOT + XOR Logic beyond 10 Gbit/s

Abstract

All-optical phase-shift-keying (PSK) data conversion beyond 10 Gbit/s in a carbon-doped silicon carbide (SiC:C) waveguide microring resonator with the nonlinear Kerr effect switching is demonstrated. As the nonlinear group index change (Δn g ) of 1.65 × 10 −4 is induced in the SiC:C microring with a gap spacing of 1300 nm, the nonlinear Kerr switching enhances the signal-to-noise ratio (SNR) of the converted amplitude-shiftkeying (ASK) data to 12.4 dB. The conversion between ASK and PSK modulation formats can be performed by such a nonlinear phase variation in the SiC:C microring. By combining the microring-based delay-line interference to demodulate the PSK format, the received SNR, extinction ratio, and bit-error ratio of the demodulated PSK data are obtained as 4.1 dB, 11 dB, and 1.1 × 10 −5 , respectively. The SiC:C composite microring phase modulator not only performs the conversion between the PSK and ASK formats but also provides the encryption algorithm for input data to facilitate the security of data transmission and streaming applications.

Higher-Order Nonlinear Effects on Optical Soliton Propagation and Their Interactions

“…However, due to special requirements on fiber velocity, transmission capacity, interference immunity, security, and other aspects in the fields of communication and national defense, researchers have gradually shifted the focus of research to the nonlinear effects in optical fibers. [1][2][3][4][5][6][7] In addition, as the transmission distance increases, a larger channel transmission power is required to overcome fiber loss, which means that the channel sending power will lead to higher-order nonlinear effects in a system. At this time, the impact of higher-order nonlinear effects on the pulse transmission becomes assignable.…”