Abstract
Digital nonlinearity compensation (NLC) schemes such as digital backpropagation and Volterra equalization are well known to be effective techniques in mitigating optical fiber nonlinearity, thus offering improved transmission performance. Alternatively, optical NLC, and specifically optical phase conjugation (OPC), has been proposed to relax the digital signal processing complexity. In this paper, a novel hybrid optical-digital NLC scheme combining OPC and a Volterra equalizer is proposed, termed Volterra-Assisted OPC (VAO). It has a twofold advantage: it overcomes the OPC limitation in asymmetric links and substantially enhances the performance of Volterra equalizers. When NLC is operated over the entire transmitted optical bandwidth, the proposed scheme is shown to outperform both OPC and Volterra equalization alone by up to 4.2 dB in a five-channel, 32 GBaud PM-16QAM transmission over a 1000 km EDFA-amplified fiber link. Moreover, VAO is also demonstrated to be very robust when applied to long-transmission distances, with a 2.5-dB gain over OPC-only systems at 3000 km. VAO combines the advantages of both optical and digital NLC offering a promising tradeoff between performance and complexity for future high-speed optical communication systems.
| Original language | English |
|---|---|
| Article number | 8675370 |
| Pages (from-to) | 2467-2479 |
| Number of pages | 13 |
| Journal | Journal of Lightwave Technology |
| Volume | 37 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 15 May 2019 |
Fingerprint
Keywords
- Digital signal processing
- fiber nonlinear optics
- non-linear equalization
- optical signal processing
- Volterra series
Cite this
}
Volterra-assisted optical phase conjugation : a hybrid optical-digital scheme for fiber nonlinearity compensation. / Saavedra, Gabriel (Corresponding author); Liga, Gabriele; Bayvel, Polina.
In: Journal of Lightwave Technology, Vol. 37, No. 10, 8675370, 15.05.2019, p. 2467-2479.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Volterra-assisted optical phase conjugation
T2 - a hybrid optical-digital scheme for fiber nonlinearity compensation
AU - Saavedra, Gabriel
AU - Liga, Gabriele
AU - Bayvel, Polina
PY - 2019/5/15
Y1 - 2019/5/15
N2 - Digital nonlinearity compensation (NLC) schemes such as digital backpropagation and Volterra equalization are well known to be effective techniques in mitigating optical fiber nonlinearity, thus offering improved transmission performance. Alternatively, optical NLC, and specifically optical phase conjugation (OPC), has been proposed to relax the digital signal processing complexity. In this paper, a novel hybrid optical-digital NLC scheme combining OPC and a Volterra equalizer is proposed, termed Volterra-Assisted OPC (VAO). It has a twofold advantage: it overcomes the OPC limitation in asymmetric links and substantially enhances the performance of Volterra equalizers. When NLC is operated over the entire transmitted optical bandwidth, the proposed scheme is shown to outperform both OPC and Volterra equalization alone by up to 4.2 dB in a five-channel, 32 GBaud PM-16QAM transmission over a 1000 km EDFA-amplified fiber link. Moreover, VAO is also demonstrated to be very robust when applied to long-transmission distances, with a 2.5-dB gain over OPC-only systems at 3000 km. VAO combines the advantages of both optical and digital NLC offering a promising tradeoff between performance and complexity for future high-speed optical communication systems.
AB - Digital nonlinearity compensation (NLC) schemes such as digital backpropagation and Volterra equalization are well known to be effective techniques in mitigating optical fiber nonlinearity, thus offering improved transmission performance. Alternatively, optical NLC, and specifically optical phase conjugation (OPC), has been proposed to relax the digital signal processing complexity. In this paper, a novel hybrid optical-digital NLC scheme combining OPC and a Volterra equalizer is proposed, termed Volterra-Assisted OPC (VAO). It has a twofold advantage: it overcomes the OPC limitation in asymmetric links and substantially enhances the performance of Volterra equalizers. When NLC is operated over the entire transmitted optical bandwidth, the proposed scheme is shown to outperform both OPC and Volterra equalization alone by up to 4.2 dB in a five-channel, 32 GBaud PM-16QAM transmission over a 1000 km EDFA-amplified fiber link. Moreover, VAO is also demonstrated to be very robust when applied to long-transmission distances, with a 2.5-dB gain over OPC-only systems at 3000 km. VAO combines the advantages of both optical and digital NLC offering a promising tradeoff between performance and complexity for future high-speed optical communication systems.
KW - Digital signal processing
KW - fiber nonlinear optics
KW - non-linear equalization
KW - optical signal processing
KW - Volterra series
UR - http://www.scopus.com/inward/record.url?scp=85064978823&partnerID=8YFLogxK
U2 - 10.1109/JLT.2019.2907821
DO - 10.1109/JLT.2019.2907821
M3 - Article
AN - SCOPUS:85064978823
VL - 37
SP - 2467
EP - 2479
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
SN - 0733-8724
IS - 10
M1 - 8675370
ER -