RSOP Equalization through an Extend Kalman Filter Scheme in Stokes Vector Direct Detection System

Shang, Qisong; Zheng, Zibo; Cui, Nan; Zhang, Nannan; Zhang, Wenbo; Xu, Hengying; Tang, Xianfeng; Xi, Lixia; Zhang, Xiaoguang

doi:10.1364/cleo_at.2018.jtu2a.47

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…In the PolSK technique, signal is modulated by changing the polarization state (SOP). However, this technique is vulnerable to SOP changes occured by fiber transmission and optical active devices [10][11][12][13], especially rotation of SOP (RSOP). When the signal is modulated and transmitted through optical fiber, it is received in a different polarization state.…”

Section: Introductionmentioning

confidence: 99%

Single PD optical detection of optical intensity and polarization-modulated signals in multidimensional optical transmission

Lee

Park

Han

2023

Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII

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Data traffic is increasing explosively because of the development of various mobile applications and services for 5G and B5G communication. Optical intensity modulation has been used in optical access networks. However, due to the modulation bandwidth limitation of the optical modulator and the fiber dispersion, it is difficult to support the increasing data traffic only using optical intensity modulation. Therefore, multidimensional optical transmission using various optical resources has been researched. Modulation using optical polarization is widely studied as one of the multidimensional modulation resources because the system is simpler than other techniques. However, due to the squarelaw detection, which is an intensity-based signal reception, the signal needs to be received for each dimension respectively at the receivers, so the complexity of the optical receiver is increased as multiple resources are used. In this paper, we propose a single PD based signal receiving technique for the multidimensional signals modulated on optical intensity and optical polarization. The multidimensional optical signal is distorted by interdimensional interference. The proposed technique minimizes interference when receiving optical intensity and polarization modulated signals using a single PD. The proposed technique can separate each modulated signal for each modulation dimension of the multidimensional optical signals. We experimented the multidimensional signal detection using a single PD. We experimentally verified the BER performance of the QAM-PIRFSK signal transmission.

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Section: Introductionmentioning

confidence: 99%

Single PD optical detection of optical intensity and polarization-modulated signals in multidimensional optical transmission

Lee

Park

Han

2023

Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII

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“…However, PolSK have critical drawbacks such that it is vulnerable to SOP change, especially rotation of SOP (RSOP). When transmitting an optical signal, the polarization changes according to the characteristics of the optical fiber and optical active devices; specifically, external environmental factors can cause SOP changes from a few kilorads per second to a few megarads per second [10][11][12][13]. Thus, when the signal is modulated and transmitted through optical fiber, it is received in a different polarization state.…”

Section: Introductionmentioning

confidence: 99%

SOP Change Robust Optical Modulation Based on Dual Polarization Modulation for Multi-Dimensional Optical Transmission

Lee

Han

2021

IEEE Access

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In optical transmission technique using optical polarization, the change of state of polarization (SOP) and the rotation of SOP (RSOP) during optical transmission has a significant impact o the transmission performance. We propose polarized intensity rotational frequency shift keying (PIR-FSK) as a novel modulation technique in change of SOP and RSOP-tolerant optical transmissions. The proposed PIR-FSK signal does not affect the entire intensity of the optical carrier by modulating the sinusoidal signals on each X and Y-polarized optical carrier. Therefore, the proposed PIR-FSK modulation and optical carrier intensity modulation can operate at the same time. Moreover, since the proposed technique does not modulate the signal using the SOP unlike the PolSK, PIR-FSK is not affected by SOP changes that occur during transmission, and the signal does not be degraded even with RSOP. We demonstrated that the signals modulated using the proposed PIR-FSK modulation have higher signal capacity and efficiency compared to the signal modulated using PolSK modulation. INDEX TERMSFrequency shift keying, Multi-dimensional optical transmission,Polarization shift keying, Rotation of State of Polarization(RSOP).

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“…A real-value equalizer with 3 inputs and 2 outputs has been proposed in [14] for polarization de-multiplexing, and its weights are updated through decision feedback least mean square (LMS) or recursive least square (RLS) algorithms. Besides, the Kalman filter is introduced to achieve faster convergence speed and stronger capability for RSOP tracking [13], [15], [16]. However, conventional adaptive equalizers and Kalman filters all need certain decision feedback structures to update their coefficients.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Blind Stokes-Space Based Equalizer for RSOP in SV-DD Systems With High Chromatic Dispersion Tolerance

Jin

et al. 2020

IEEE Photonics J.

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Polarization de-multiplexing becomes challenging in Stokes vector-direct detection (SV-DD) systems, especially when the rotation of state of polarization (RSOP) and fiber chromatic dispersion (CD) are induced. To address this issue, an adaptive blind RSOP equalizer based on Stokes space is proposed. After theoretical analysis, it is found that the distribution of transmitted signals in Stokes space keeps a paraboloid. Based on this analysis, an adaptive scheme is proposed to track the symmetry axis of paraboloid for the first time. It is worth noticing that not only CD but also high-order modulation formats could not change the paraboloid distribution. Therefore, our algorithm has strong robustness to CD and good suitability for SV-DD systems with different modulation formats. In our simulation, the conventional Stokes space-based method and the training sequences (TS) method are both evaluated for comparison. The results show that our scheme can track RSOP of 20 Mrad/s and 8 Mrad/s at hard-decision forward error correction threshold in 28 Gbaud 4-level quadrature amplitude modulation (4-QAM) and 16-QAM SV-DD systems after 100 km fiber transmission, respectively. No additional computational complexity is required compared to the conventional Stokes space-based method. Moreover, compared to the TS-based method, there is no need to know the actual channel information, contributing to good flexibility.

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RSOP Equalization through an Extend Kalman Filter Scheme in Stokes Vector Direct Detection System

Cited by 5 publications

References 1 publication

Single PD optical detection of optical intensity and polarization-modulated signals in multidimensional optical transmission

Single PD optical detection of optical intensity and polarization-modulated signals in multidimensional optical transmission

SOP Change Robust Optical Modulation Based on Dual Polarization Modulation for Multi-Dimensional Optical Transmission

Adaptive Blind Stokes-Space Based Equalizer for RSOP in SV-DD Systems With High Chromatic Dispersion Tolerance

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