4 × 4 MIMO fiber-wireless transmission based on an integrated four-channel directly modulated optical transceiver

Di Zhang; Yao Ye; Lei Deng; Di Li; Haiping Song; Yucheng Zhang; Minming Zhang; Shu Wang; Deming Liu

doi:doi:10.1364/PRJ.7.001461

Photonics Research, 2019, 7 (12): 12001461, Published Online: Nov. 20, 2019

4 × 4 MIMO fiber-wireless transmission based on an integrated four-channel directly modulated optical transceiver

Di Zhang ¹Yao Ye ¹Lei Deng ^2,*Di Li ²Haiping Song ²Yucheng Zhang ²Minming Zhang ²Shu Wang ¹Deming Liu ²

Author Affiliations

¹ School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China

² Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

Figures & Tables

Fig. 1. Structure of (a) TOSA and (b) ROSA. (c) The photographs of the fabricated TOSA module. (d) Transmission of optical signals in the 42° oblique angle De-mux AWG-PLC.

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Fig. 2. (a) Simulated results of the optical CE performance versus distance and oblique angle. (b) CE performance versus different distance when the oblique angle of the De-mux AWG-PLC is set at 40°, 42°, and 44°.

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Fig. 3. Photographs of the fabricated optical transceiver module, PD array, TIA array, AWG-PLC, and DFB-LD.

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Fig. 4. Scattering parameter performance versus the frequency for each lane of the fabricated optical transceiver module: (a) S11 and (b) S21. (c) Measured SFDR3 performance versus different frequency for each lane of the fabricated optical transceiver. (d) SFDR performance of lane 3 when the central frequency is 6 GHz, the fundamental item is the output two-tone RF signal, and IMD3 is the third-order intermodulation distortion.

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Fig. 5. Schematic diagram of the modified single-loop LLL algorithm. H: matrix of the MIMO channel. Q, R are the matrix after QR decomposition of H, Q is a unitary matrix, and R is an uptriangular matrix. Im is an identity matrix. μ is the correction factor for R, H, and T. G is an orthogonal rotation matrix.

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Fig. 6. Experimental setup of the proposed 4×4 MIMO 16QAM-OFDM RoF system for both (a) downlink and (b) uplink.

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Fig. 7. Measured BER performance for 4×4 MIMO 16QAM-OFDM signals over 15.5 km SSMF and 1.2 m air transmission versus received optical power, (a) with ZF, (b) with MLSE, and (c) with LR-ZF in downlink, and (d) with ZF, (e) with MLSE, and (f) with LR-ZF in uplink.

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Table1. Real Multiplication for the Original LLL Algorithm, the Proposed LR Algorithm, and the Optimal MLSE in an $N \times N$ MIMO System

$4 \times 4$ MIMO 16QAM	Steps	Real Multiplication
LLL in Ref. [23]	4 LLL loops	$4 [(14 N^{3} - 26 N) / 3 + 4 N^{2}] = 1312$
Proposed LR	$H, T$	$4 N^{3} = 256$
	1 LLL loop	$(14 N^{3} - 26 N) / 3 + 4 N^{2} = 328$
MLSE		$\propto 10^{6}$

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Di Zhang, Yao Ye, Lei Deng, Di Li, Haiping Song, Yucheng Zhang, Minming Zhang, Shu Wang, Deming Liu. 4 × 4 MIMO fiber-wireless transmission based on an integrated four-channel directly modulated optical transceiver[J]. Photonics Research, 2019, 7(12): 12001461.

4 × 4 MIMO fiber-wireless transmission based on an integrated four-channel directly modulated optical transceiver

Fig. 1. Structure of (a) TOSA and (b) ROSA. (c) The photographs of the fabricated TOSA module. (d) Transmission of optical signals in the 42° oblique angle De-mux AWG-PLC.

Fig. 2. (a) Simulated results of the optical CE performance versus distance and oblique angle. (b) CE performance versus different distance when the oblique angle of the De-mux AWG-PLC is set at 40°, 42°, and 44°.

Fig. 3. Photographs of the fabricated optical transceiver module, PD array, TIA array, AWG-PLC, and DFB-LD.

Fig. 6. Experimental setup of the proposed 4×4 MIMO 16QAM-OFDM RoF system for both (a) downlink and (b) uplink.

Fig. 7. Measured BER performance for 4×4 MIMO 16QAM-OFDM signals over 15.5 km SSMF and 1.2 m air transmission versus received optical power, (a) with ZF, (b) with MLSE, and (c) with LR-ZF in downlink, and (d) with ZF, (e) with MLSE, and (f) with LR-ZF in uplink.

Table1. Real Multiplication for the Original LLL Algorithm, the Proposed LR Algorithm, and the Optimal MLSE in an $N \times N$ MIMO System

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4 × 4 MIMO fiber-wireless transmission based on an integrated four-channel directly modulated optical transceiver

Fig. 1. Structure of (a) TOSA and (b) ROSA. (c) The photographs of the fabricated TOSA module. (d) Transmission of optical signals in the 42° oblique angle De-mux AWG-PLC.

Fig. 2. (a) Simulated results of the optical CE performance versus distance and oblique angle. (b) CE performance versus different distance when the oblique angle of the De-mux AWG-PLC is set at 40°, 42°, and 44°.

Fig. 3. Photographs of the fabricated optical transceiver module, PD array, TIA array, AWG-PLC, and DFB-LD.

Fig. 6. Experimental setup of the proposed 4×4 MIMO 16QAM-OFDM RoF system for both (a) downlink and (b) uplink.

Fig. 7. Measured BER performance for 4×4 MIMO 16QAM-OFDM signals over 15.5 km SSMF and 1.2 m air transmission versus received optical power, (a) with ZF, (b) with MLSE, and (c) with LR-ZF in downlink, and (d) with ZF, (e) with MLSE, and (f) with LR-ZF in uplink.

Table1. Real Multiplication for the Original LLL Algorithm, the Proposed LR Algorithm, and the Optimal MLSE in an N×N MIMO System

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Table1. Real Multiplication for the Original LLL Algorithm, the Proposed LR Algorithm, and the Optimal MLSE in an $N \times N$ MIMO System