Real-time reception of NHS-OFDM signal with SPA-enhanced channel estimation for intensity-modulated direct-detection systems

Gang Chen; Ming Chen; Wen Chen; Lede Yin; Aitao Deng; Yuxin Cai; Dengqiao Wang

doi:10.3788/COL202220.050601

Chinese Optics Letters, Volume. 20, Issue 5, 050601(2022)

Real-time reception of NHS-OFDM signal with SPA-enhanced channel estimation for intensity-modulated direct-detection systems

Gang Chen, Ming Chen^*, Wen Chen, Lede Yin, Aitao Deng, Yuxin Cai, and Dengqiao Wang

Author Affiliations

School of Physics and Electronics, Hunan Normal University, Changsha 410081, China

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Figures & Tables(7)

Fig. 1. Block diagram of (a) C2R operation and (b) NHS-OFDM time-domain frame structure.

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Fig. 2. Experimental setup of the real-time NHS-OFDM transmission system with IMDD. Inset (a) is OFDM frame structure, (b), (c) are the baseband transceivers hardware platforms, and (d), (e) are the RTL schematics of the real-time NHS-OFDM transceiver.

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Fig. 3. (a)–(c) Normalized AR and (d)–(f) the EVM performance for 64/128/256-point FFTs.

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Fig. 4. Recovered constellation diagrams: (a)–(c) LS, (d)–(f) ISFA, and (g)–(i) SPA for different FFT sizes.

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Fig. 5. Real-time and offline measured BER performance versus ROP: (a) 64-point and (b) 128-point FFTs.

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Table 1. Some Key Parameters Used in the Experiment

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Table 1. Some Key Parameters Used in the Experiment

Item	Parameter	Value		Unit
OFDM frame	Modulation format	16QAM		–
	IFFT/FFT	64	128	Points
	Data SCs	50	100	–
	CP length	8		Points
	TS symbols per frame	1		–
	Data-carrying OFDM symbols	300	150	–
	Digital clipping ratio	12		dB
	Net signal bit rate	3.46	3.65	Gbit/s
	SE	3.54	3.74	bit·s⁻¹·Hz⁻¹
	OFDM frame duration	17.34	16.43	µs
DAC&ADC	Sampling rate	2.5		GSa/s
DAC&ADC	Resolution	14/10		Bit
LPF	Bandwidth	$\sim 1$		GHz
LPF	Depth	30		dB
EA1&EA2	Bandwidth	12 (4.5)		GHz
DML	Operation wavelength	1556.3		nm
DML	Output power	2.3		dBm
SSMF	Length	20		km
	Attenuation	0.18		dB/km
	Dispersion	17		ps·nm⁻¹·km⁻¹
PIN	Bandwidth	10		GHz
PIN	Coupling mode	AC		–

Table 2. The Device Utilization of the SPA/ISFA Sub-Module in NHS-OFDM with 64/128/256-Point FFT Functions^a
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Table 2. The Device Utilization of the SPA/ISFA Sub-Module in NHS-OFDM with 64/128/256-Point FFT Functions^a
FFT Size CE Methods Registers LUTs
64 ISFA 2256 2877
SPA 2160 2060
128 ISFA 4048 5428
SPA 4080 4238
256 ISFA 7632 10,612
SPA 7630 8545

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Gang Chen, Ming Chen, Wen Chen, Lede Yin, Aitao Deng, Yuxin Cai, Dengqiao Wang, "Real-time reception of NHS-OFDM signal with SPA-enhanced channel estimation for intensity-modulated direct-detection systems," Chin. Opt. Lett. 20, 050601 (2022)

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Jan. 14, 2022

Accepted: Mar. 7, 2022

Published Online: Mar. 25, 2022

The Author Email: Ming Chen (ming.chen@hunnu.edu.cn)

DOI:10.3788/COL202220.050601

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Some Key Parameters Used in the Experiment

Table 1. Some Key Parameters Used in the Experiment

Table 2. The Device Utilization of the SPA/ISFA Sub-Module in NHS-OFDM with 64/128/256-Point FFT Functionsa

Table 2. The Device Utilization of the SPA/ISFA Sub-Module in NHS-OFDM with 64/128/256-Point FFT Functionsa

Table 2. The Device Utilization of the SPA/ISFA Sub-Module in NHS-OFDM with 64/128/256-Point FFT Functions^a

Table 2. The Device Utilization of the SPA/ISFA Sub-Module in NHS-OFDM with 64/128/256-Point FFT Functions^a