High-Performance Clock Recovery Algorithm for Faster-than-Nyquist Systems

Fengying Lai; Minming Geng; Yuan Mo; Rui Cen; Qiang Liu; Zhenrong Zhang

doi:10.3788/AOS241634

Acta Optica Sinica, Volume. 45, Issue 3, 0306001(2025)

High-Performance Clock Recovery Algorithm for Faster-than-Nyquist Systems

Fengying Lai^1,2, Minming Geng^1,2,3,4、*, Yuan Mo^1,2, Rui Cen^1,2, Qiang Liu^1,2, and Zhenrong Zhang^1,2

Author Affiliations

¹School of Computer, Electronics and Information, Guangxi University, Nanning 530004, Guangxi , China

²Guangxi Key Laboratory of Multimedia Communications and Network Technology, Nanning 530004, Guangxi , China

³Key Laboratory of Multimedia Communications and Information Processing of Guangxi Higher Education Institutes, Nanning 530004, Guangxi , China

⁴Guangxi Experiment Center of Information Science, Guilin 541004, Guangxi , China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(13)

Fig. 1. Diagram of clock recovery loop

Download full size

Fig. 2. Diagram of PDM-FTN-16QAM coherent optical transmission system

Download full size

$Output of fractional interval of Gardner algorithm when sampling frequency error is 10-4$

Fig. 3. Output of fractional interval of Gardner algorithm when sampling frequency error is 10^-4

Download full size

$Influences of different compression factors on fractional interval and output control word W of loop filter, when sampling frequency error is 10-4. (a)(b) τ=0.90; (c)(d) τ=0.85; (e)(f) τ=0.80$

Fig. 4. Influences of different compression factors on fractional interval and output control word W of loop filter, when sampling frequency error is 10^-4. (a)(b) $τ$ =0.90; (c)(d) $τ$ =0.85; (e)(f) $τ$ =0.80

Download full size

Fig. 5. Operation of non-joint timing recovery algorithm when PMD is 200 ps and sampling frequency error is 10^-4. (a) Fractional interval; (b) output control word W of loop filter

Download full size

Fig. 6. Diagram of joint algorithm of adaptive equalization and power-based clock recovery

Download full size

Fig. 7. Operation of AE-PCR scheme when sampling frequency error is 10^-4 for BTB transmission. (a) Fractional interval; (b) output control word W of loop filter; (c) input constellation diagram; (d) output constellation diagram

Download full size

Fig. 8. Operation of AE-PCR scheme when PMD is 200 ps and sampling frequency error is 10^-4. (a) Fractional interval; (b) output control word W of loop filter; (c) input constellation diagram; (d) output constellation diagram

Download full size

Fig. 9. Bit error rate performance simulated by different algorithms with different PMD. (a) BTB (PMD is zero); (b) PMD is 200 ps

Download full size

Table 1. List of basic parameters
View table
Table 1. List of basic parameters
Parameter Value
OSNR /dB 18
Length of PRBS 2¹⁹
Shaping pulse roll-off factor $β$ 0.2
Compression factor $τ$ 0.85
Length of filter taps 45
Clock error /10^-6 100

Table 2. Convergence-required symbol number of power-based clock recovery algorithm with different sampling frequency errors
View table
Table 2. Convergence-required symbol number of power-based clock recovery algorithm with different sampling frequency errors
Clock error /10^-6 Convergence-required symbol number /10³
50 108
100 115
150 150

Table 3. Convergence-required symbol number of AE-PCR algorithm with different sampling frequency errors
View table
Table 3. Convergence-required symbol number of AE-PCR algorithm with different sampling frequency errors
Clock
error /10^-6
Convergence-required symbol number /10³ Reduction ratio relative to Table 2 /%
50 50 53.7
100 55 52.1
150 70 53.3

Table 4. Convergence-required symbol number of AE-PCR algorithm with different compression factors in BTB transmission
View table
Table 4. Convergence-required symbol number of AE-PCR algorithm with different compression factors in BTB transmission
Compression factor Convergence-required symbol number /10³ Reduction ratio relative to figure 4 /%
0.90 50 52.4
0.85 55 52.2
0.80 76 53.9

Tools

Get Citation

Copy Citation Text

Fengying Lai, Minming Geng, Yuan Mo, Rui Cen, Qiang Liu, Zhenrong Zhang. High-Performance Clock Recovery Algorithm for Faster-than-Nyquist Systems[J]. Acta Optica Sinica, 2025, 45(3): 0306001

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites

Paper Information

Category: Fiber Optics and Optical Communications

Received: Oct. 10, 2024

Accepted: Nov. 6, 2024

Published Online: Feb. 20, 2025

The Author Email: Geng Minming (gengmm@gxu.edu.cn)

DOI:10.3788/AOS241634

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. List of basic parameters

Table 1. List of basic parameters

Table 2. Convergence-required symbol number of power-based clock recovery algorithm with different sampling frequency errors

Table 2. Convergence-required symbol number of power-based clock recovery algorithm with different sampling frequency errors

Table 3. Convergence-required symbol number of AE-PCR algorithm with different sampling frequency errors

Table 3. Convergence-required symbol number of AE-PCR algorithm with different sampling frequency errors

Table 4. Convergence-required symbol number of AE-PCR algorithm with different compression factors in BTB transmission

Table 4. Convergence-required symbol number of AE-PCR algorithm with different compression factors in BTB transmission