TY - JOUR
T1 - 2×2-channel mode-wavelength division multiplexing in Ro-FSO system with PCF mode group demultiplexers and equalizers
AU - Amphawan, Angela
AU - Chaudhary, Sushank
AU - Ghassemlooy, Zabih
AU - Neo, Tse Kian
PY - 2020/7/15
Y1 - 2020/7/15
N2 - This paper presents a 2×2 channel mode-wavelength division multiplexing (MWDM) scheme for a radio-over-free-space optics (Ro-FSO) system. The key features of the MWDM system are four dual-core PCF mode (de)multiplexers for the conversion of the fundamental mode to two mode groups at the transmitter/combination of two mode groups at the receiver, and four single-core PCFs for equalization of the modal power in the received signals to compensate for mode coupling from the FSO channel. The PCFs are designed and analyzed using the full-vector finite element method at a wavelength of 1550nm. Numerical results demonstrate that the dual-core PCFs at the transmitter successfully convert the fundamental mode into two distinct mode groups at a ratio of 46.4% to 41.2%, and 43.6% to 44.5%. At the receiver, a single-core PCF equalizer restores the output power to 96.7%, 96.3%, 95.4% and 95.1% of the maximum transmitted power in the designated mode group for each channel. The improvement in achievable distance for the MWDM Ro-FSO system at the same BER level is evident under medium and heavy fog.
AB - This paper presents a 2×2 channel mode-wavelength division multiplexing (MWDM) scheme for a radio-over-free-space optics (Ro-FSO) system. The key features of the MWDM system are four dual-core PCF mode (de)multiplexers for the conversion of the fundamental mode to two mode groups at the transmitter/combination of two mode groups at the receiver, and four single-core PCFs for equalization of the modal power in the received signals to compensate for mode coupling from the FSO channel. The PCFs are designed and analyzed using the full-vector finite element method at a wavelength of 1550nm. Numerical results demonstrate that the dual-core PCFs at the transmitter successfully convert the fundamental mode into two distinct mode groups at a ratio of 46.4% to 41.2%, and 43.6% to 44.5%. At the receiver, a single-core PCF equalizer restores the output power to 96.7%, 96.3%, 95.4% and 95.1% of the maximum transmitted power in the designated mode group for each channel. The improvement in achievable distance for the MWDM Ro-FSO system at the same BER level is evident under medium and heavy fog.
KW - Communications system
KW - Free-space optical communication
KW - Modal dispersion
KW - Mode demultiplexing
KW - Mode equalization
KW - Radio-over-free space optics
KW - Space division multiplexing
KW - Spatial diversity
UR - http://www.scopus.com/inward/record.url?scp=85082172617&partnerID=8YFLogxK
U2 - 10.1016/j.optcom.2020.125539
DO - 10.1016/j.optcom.2020.125539
M3 - Article
AN - SCOPUS:85082172617
SN - 0030-4018
VL - 467
JO - Optics Communications
JF - Optics Communications
M1 - 125539
ER -