TY - JOUR
T1 - A Study on Sampling Penalties Reduction of Kramers-Kronig Receivers
AU - Toba, Kentaro
AU - Fujita, Takaha
AU - Tsukui, Enzo
AU - Sampath, Kariyawasam Indipalage Amila
AU - Maeda, Joji
N1 - Funding Information:
Manuscript received March 15, 2021; revised June 12, 2021; accepted June 30, 2021. Date of publication July 26, 2021; date of current version October 4, 2021. This work was supported by JSPS KAKENHI under Grants JP19H02134 and JP20K14739. (Corresponding author: Kentaro Toba.) Kentaro Toba was with the Department of Electrical Engineering, Graduate School of Science and Technology, Tokyo University of Science, Noda 2788510, Japan, and is now with Fujitsu Optical Components Ltd., Kawasaki 2118588, Japan (e-mail: 7319549@ed.tus.ac.jp).
Publisher Copyright:
© 1983-2012 IEEE.
PY - 2021/10/1
Y1 - 2021/10/1
N2 - Kramers-Kronig (KK) relation-based receiver can recover the field using a single-photodiode. However, the KK receiver requires a high carrier-to-signal power ratio (CSPR), and digital signal processing performed a few times faster than the Nyquist sampling rate. We propose a method to relax the requirements for sampling rate and CSPR by using digital upsampling with harmonic filtering. In the proposed method, log calculation of the KK algorithm is preceded by digital upsampling and followed by harmonics elimination and downsampling, respectively. Our results predict that the combination of digital upsampling and harmonic elimination can comply with the requirement of 2nd generation FEC limit in 16-QAM 40-km transmission with the following signal parameters, CSPR 6.7 dB, ADC sampling rate 2.5 sps, digital upsampling 3 sps. We propose performing harmonic elimination in combination with Hilbert transform using a single finite impulse response (FIR) filter to increase computation efficiency. Compared with the frequency-domain implementation, similar performances were observed for FIR filters of length 33 or higher.
AB - Kramers-Kronig (KK) relation-based receiver can recover the field using a single-photodiode. However, the KK receiver requires a high carrier-to-signal power ratio (CSPR), and digital signal processing performed a few times faster than the Nyquist sampling rate. We propose a method to relax the requirements for sampling rate and CSPR by using digital upsampling with harmonic filtering. In the proposed method, log calculation of the KK algorithm is preceded by digital upsampling and followed by harmonics elimination and downsampling, respectively. Our results predict that the combination of digital upsampling and harmonic elimination can comply with the requirement of 2nd generation FEC limit in 16-QAM 40-km transmission with the following signal parameters, CSPR 6.7 dB, ADC sampling rate 2.5 sps, digital upsampling 3 sps. We propose performing harmonic elimination in combination with Hilbert transform using a single finite impulse response (FIR) filter to increase computation efficiency. Compared with the frequency-domain implementation, similar performances were observed for FIR filters of length 33 or higher.
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U2 - 10.1109/JLT.2021.3099938
DO - 10.1109/JLT.2021.3099938
M3 - Article
AN - SCOPUS:85111591885
VL - 39
SP - 6054
EP - 6062
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
SN - 0733-8724
IS - 19
ER -