Fig 1.
Is-OWC link.
Fig 2.
Proposed 10 × 400 Gbps WDM-MDM-DP-QPSKIs-OWC system.
Fig 3.
DP-QPSK transmitter unit.
Fig 4.
Excited modes at the transmitter (a) HG 00 mode (b) HG 01 mode.
Fig 5.
Optical spectrum at transmitter side (a) channel 1 (b) channel 2 (c) channel 3 (d) channel 4 (e) channel 5 (f) channel 6 (g) channel 7 (h) channel 8 (i) channel 9 (j) channel 10.
Fig 6.
Receiver section of the proposed 10 × 400 Gbps WDM-MDM-DP-QPSKIs-OWC system.
Fig 7.
Optical coherent DP-QPSK receiver unit.
Table 1.
Modelling parameters of the proposed MDM-WDM-DPQPSK-Is-OWC system.
Fig 8.
Evaluation of measured SNR for (a) channels 1, 3, 5, 7 and 9 for HG01 mode transmission and (b) channels 2, 4, 6, 8 and 10 for HG02 mode transmission.
Fig 9.
Measured power at output of receiver for (a) channels 1, 3, 5, 7 & 9 for HG01 mode transmission and (b) channels 2, 4, 6, 8 & 10 for HG02 mode transmission.
Table 2.
Measured SNR and total received power without space turbulences.
Fig 10.
Measured constellations (17500 kms) at the receiver side before digital signal processing unit (a) channel 1 (b) channel 2 (c) channel 3 (d) channel 4 (e) channel 5 (f) channel 6 (g) channel 7 (h) channel 8 (i) channel 9 (j) channel 10.
Fig 11.
Measured constellations (17500 kms) at the receiver side after digital signal processing unit (a) channel 1 (b) channel 2 (c) channel 3 (d) channel 4 (e) channel 5 (f) channel 6 (g) channel 7 (h) channel 8 (i) channel 9 (j) channel 10.
Fig 12.
Evaluation of measured SNR under transmitting pointing error for (a) channels 1, 3, 5, 7 & 9 for HG01 mode transmission and (b) channels 2, 4, 6, 8 & 10 for HG02 mode transmission.
Fig 13.
Measured power at output of receiver under the impact of transmitting error for (a) channels 1, 3, 5, 7 and 9 for HG01 mode transmission and (b) channels 2, 4, 6, 8 and 10 for HG02 mode transmission.
Fig 14.
Evaluation of measured SNR under receiving pointing error for (a) channels 1, 3, 5, 7 and 9 for HG01 mode transmission and (b) channels 2, 4, 6, 8 & 10 for HG02 mode transmission.
Fig 15.
Measured power at output of receiver under the influence of receiving pointing error for (a) channels 1, 3, 5, 7 and 9 for HG01 mode transmission and (b) channels 2, 4, 6, 8 and 10 for HG02 mode transmission.