Simplified 3 channel PAM4 Nyquist TDM transmitter

Stefan Preussler; Arijit Misra; Karanveer Singh; Janosch Meier; Thomas Schneider

doi:10.1117/12.2576876

5 March 2021 Simplified 3 channel PAM4 Nyquist TDM transmitter

Stefan Preussler, Arijit Misra, Karanveer Singh, Janosch Meier, Thomas Schneider

Proceedings Volume 11713, Next-Generation Optical Communication: Components, Sub-Systems, and Systems X; 117130E (2021) https://doi.org/10.1117/12.2576876
Event: SPIE OPTO, 2021, Online Only

Abstract

With an ever increasing amount of end user devices connected to the internet, the global data traffic, especially within data centers, increases significantly. In order to keep pace, the current 100 Gbps standard (4 lines x 25 Gbps) needs to be upgraded. There are several possibilities to increase the data rate per line. The easiest way is to use multilevel modulation formats such as PAM4 with 2 bit per symbol or PAM8 or 16. Furthermore, optical multiplexing should be taken into account to maximize the bandwidth usage. Especially, optical signal processing with Nyquist pulses shows no inter-symbol interference, exhibit a rectangular spectrum and enables transmission at the maximum possible symbol rate for a given bandwidth. Here we present a simplified concept for ideal Nyquist pulse generation and simultaneous data modulation using just a single modulator per channel. Thereby, a laser source is split into three branches and the data signal is mixed electrically with a sine wave and then transferred into the optical domain, leading to a modulated Nyquist pulse train. The time delay between each Nyquist Pulse sequence for multiplexing is realized by a simple phase shift of the sinusoidal signal. With 3 time-domain channels, the proposed method achieved an aggregate baud rate, which corresponds to the full optical bandwidth of the modulators. On the contrary, the electronics require only 1/3 of the bandwidth. Due to the simple setup, integration on a silicon photonics platform might be straight forward. Preliminary simulation results show data transmission with PAM4 modulation at low bit error rates.

Conference Presentation

Citation Download Citation

Stefan Preussler, Arijit Misra, Karanveer Singh, Janosch Meier, and Thomas Schneider "Simplified 3 channel PAM4 Nyquist TDM transmitter", Proc. SPIE 11713, Next-Generation Optical Communication: Components, Sub-Systems, and Systems X, 117130E (5 March 2021); https://doi.org/10.1117/12.2576876

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