Seamless translation of optical fiber PolMux-OFDM into a 2×2 MIMO wireless transmission enabled by digital training-based fiber-wireless channel estimation

Abstract

We propose and demonstrate a 2 × 2 multiple-input multiple-output (MIMO) wireless over fiber transmission system. Seamless translation of two orthogonal frequency division multiplexing (OFDM) signals on dual optical polarization states into wireless MIMO transmission at 795.5 Mbit/s net data rate is enabled by using digital training-based channel estimation. A net spectral efficiency of 2.55 bit/s/Hz is achieved.

Empirical analysis of polarization division multiplexing-dense wavelength division multiplexing hybrid multiplexing techniques for channel capacity enhancement

“…Increasing transmission distance leads to deterioration of BER and jeopardization of net channel capacity. Pang et al [20] worked with multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) gigabit fiber, based on polarization division multiplexing-dense wavelength division multiplexing (PDM-WDM) over single-mode fiber. Similar research was undertaken by Zhang et al [21], where a PDM-WDM multiplexing system was used but with a pulse-amplitude modulation (PAM) technique with single mode fiber (SMF).…”

“…1, February 2023: 590-600 598 PDM-OFDM multiplexing system based on NRZ modulation over a distance of 22.6 km SSMF with a net speed of 1.2 Gbits/s whereas our proposed technique has attained a net speed of 4.16 Tbits/s over a range of 50 km. Pang[20] designed a WDM-PDM hybrid technique based on a 16-QAM modulation technique reaching a distance of 22.8 km over SMF with a net data rate of 1.59 Gbits/s. Zhang[21] also performed an analysis on the WDM-PDM technique with the PAM-4 modulation technique reaching a maximum distance of 40 km on SMF and a net capacity of 550 Gbits/s.…”

Design of high capacity 5.76 Tbits/s SDM-PDM-Nyquist superchannel WDM hybrid multiplexing in 3.1% Germania doped MMF

“…The researcher in [10] designed a hybrid OFDM-WDM-PON covering a distance of 120 km using 4-Ary QAM with a channel capacity of 3.52 Tbits/s. Earlier than that, Pang in [11] also designed MIMO-OFDM gigabit fiber, with polarization division multiplexing on a single mode fiber span reaching a transmission capacity of 1.59 Gbits/s covering 22.8 km. Zhang in [12] also did a similar work where he used PAM modulation technique over SMF and successfully reached 40 km distance with a transmission capacity of 550 Gbits/s.…”