Performance Evaluation of InP-Based DP-IQ Modulators for Multiband Transmission Systems

Sena, Matheus; Cui, Yaonian; Fiol, G.; Shariati, Behnam; Napoli, Antonio; Fischer, Johannes; Schell, Martin; Freund, Ronald

doi:10.1109/icton51198.2020.9203554

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…As depicted, the transmitter is composed by a 4-ch 84 GSa/s DAC and a commercial C-band optical multi-format transmitter comprising a quad-set of driver amplifiers and a LiNbO 3 -based DP IQ-modulator. To account for MB component-induced impairments [25], we applied Volterrabased digital pre-distortion (DPD) as it has been proven to be a successful way to boost b2b performance in S+C+L-band systems [25]. Therefore, in our experiment we characterized the transmitter with a truncated, time-invariant 3 rd -order Volterra series (256 taps in the first order, 9 taps in the second and third orders) and utilized this model to create a Volterra-based DPD filter, which was synthesized using indirect learning architecture [27].…”

Section: ) Experimental Setupmentioning

confidence: 99%

“…The SHB is characterized by the appearance of a very narrow dip in the spectrum, which causes a gain compression for a narrow wavelength range [24]. This effect can cause degradation of the channel's optical signal-to-noise ratio (OSNR) and severely impact the L-band transmission [25]. Similarly to the tilt case, the SHB is expected to leave a specific signature in the indicator map.…”

Section: ) Experimental Setupmentioning

confidence: 99%

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DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

Sena

Emmerich

Shariati

et al. 2022

J. Lightwave Technol.

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A successful migration from current C-band based optical networks to a multiband scenario primarily depends on the development of solutions that can reliably measure physical properties of optical links over broad spectral transmission windows. Additionally, these solutions must be capable of delivering wavelength-dependent and spatially-resolved indicators that can empower network operators to identify faults before they lead to severe service disruptions. Recently, the exploitation of receiver based digital signal processing as a tool for optical performance monitoring has gained tremendous popularity. One successful example is the so-called in-situ power profile estimator, which can reconstruct the per-channel longitudinal power profile along the optical fiber link solely processing the received signal samples. In this work, we propose a novel application for the in-situ power profile estimator by harnessing it on multiple wavelengths to accurately estimate the spectral gain profile of C+L-band in-line Erbium-doped fiber amplifiers deployed in a 280-km single mode fiber link. Furthermore, we show how this scheme can be efficiently used to detect amplification-related anomalies, such as gain tilt and narrowband gain compression. In our measurements, we achieved a sub-dB estimation accuracy by comparing the proposed gain extraction approach with the back-to-back characterization obtained from an optical spectrum analyzer.

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Section: ) Experimental Setupmentioning

confidence: 99%

Section: ) Experimental Setupmentioning

confidence: 99%

DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

Sena

Emmerich

Shariati

et al. 2022

J. Lightwave Technol.

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“…In addition to silicon, lithium niobate (LiNbO 3 ) and indium phosphide (InP) modulators are potential candidates for UWB modulation. Recently, a simulative study has evaluated several InP modulator designs [102]. One of the critical building blocks for UWB operation of InP is the integrated beam splitters usually implemented in the form of multimode interference (MMI) couplers.…”

Section: Mitigation Of Transceiver Impairmentsmentioning

confidence: 99%

“…Due to the wavelength dependence of the MMI splitting ratio, their operation over a wide wavelength range can lead to significant variations in terms of insertion loss (IL), power imbalance, and phase error of the modulator [103]. These variations can lead to unacceptable penalties [102]. However, initial results show that proper InP MMI designs can achieve a low variation of the splitting ratio and, thus, a high spectrum availability with low penalty [102].…”

Section: Mitigation Of Transceiver Impairmentsmentioning

confidence: 99%

Ultrawideband Systems and Networks: Beyond C + L-Band

et al. 2022

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In the evolution of optical networks, spectral efficiency (SE) enhancement has been the most cost-efficient and thus the main driver for capacity increase for decades. As a result, the development of optical transport systems has been focused on the C-and L-bands, where silica optical fiber exhibits the lowest attenuation, and erbium-doped fiber amplifiers provide an efficient solution to compensate for the optical loss. With a gradual maturity in the SE growth, however, the extension of the optical bandwidth beyond the C + L-band is expected to play a significant role in future capacity upgrades of optical networks and, thus, attract increasing research interests. In this article, we discuss the merits and challenges of ultrawideband optical transport systems and networks beyond conventional bands. KEYWORDS | Optical communication; optical network and switching; optical transceiver (TRx); Raman amplification; ultrawideband (UWB) transmission; wavelength conversion; wavelength-division multiplexing (WDM).

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“…On the contrary, the contribution of the optical components can become dominant in MB systems. In particular, the splitting ratio of the power splitter and combiner may present wavelength-dependency, introducing additional amplitude imbalance and limiting the achievable performance [7]. These components are crucial since, unlike the Mach-Zehnder modulator (MZM) and the phase shifter, they have no inherent electrical control mechanism.…”

Section: A Transmittermentioning

confidence: 99%

Characterization, Monitoring, and Mitigation of the I/Q Imbalance in Standard C-Band Transceivers in Multi-Band Systems

Rosa

Emmerich

Sena

et al. 2022

J. Lightwave Technol.

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Next-generation optical communication networks aim to vastly increase capacity by exploiting a larger optical transmission window covering the S-C-L-band. Simultaneously, the clear market trend is to maximize capacity per wavelength to reduce operational costs. This approach requires an increase in spectral efficiency, resulting in stringent requirements on the transceivers, which may not be satisfied in a multi-band (MB) scenario by current commercial components designed for operation in C-band. Transceiver specifications for MB operation can be relaxed through additional digital signal processing (DSP), at the cost of additional complexity, and by more resourceintensive calibration procedures. In this context, we experimentally characterize the wavelength-dependent frequency-resolved in-phase/quadrature (I/Q) imbalance of a standard C-band IQmodulator and coherent receiver operating in an S-C-L-band system utilizing receiver-side DSP. This operation allows us to understand the nature of the wavelength-dependency of I/Q imbalance in MB systems. In the considered scenario, we validate the effectiveness of a cost-effective strategy for transceiver impairments mitigation and monitoring based on standard wavelengthindependent calibration and reduced-complexity DSP.

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Performance Evaluation of InP-Based DP-IQ Modulators for Multiband Transmission Systems

Cited by 5 publications

References 12 publications

DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

Ultrawideband Systems and Networks: Beyond C + L-Band

Characterization, Monitoring, and Mitigation of the I/Q Imbalance in Standard C-Band Transceivers in Multi-Band Systems

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