128 GSa/s SiGe DAC Implementation Enabling 1.52 Tb/s Single Carrier Transmission

Buchali, Fred; Aref, Vahid; Dischler, Roman; Chagnon, Mathieu; Schuh, Karsten; Hettrich, Horst; Bielik, Anna; Altenhain, Lars; Guntermann, Markus; Schmid, Rolf; Möller, Michael

doi:10.1109/jlt.2020.3034535

Cited by 25 publications

(16 citation statements)

References 17 publications

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“…The data are stored on a PC and data aided digital signal processing is applied to recover the original QAM symbols. For a more detailed description please refer to [55], [56].…”

Section: B High-speed Optical Transmission Systemmentioning

confidence: 99%

SiGe HBTs and BiCMOS Technology for Present and Future Millimeter-Wave Systems

et al. 2021

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“…The data are stored on a PC and data aided digital signal processing is applied to recover the original QAM symbols. For a more detailed description please refer to [55], [56].…”

Section: B High-speed Optical Transmission Systemmentioning

confidence: 99%

SiGe HBTs and BiCMOS Technology for Present and Future Millimeter-Wave Systems

et al. 2021

Self Cite

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“…where n is the effective refractive index of the fiber in a DLI, ∆L is the differential length of then two paths, and λ is the wavelength of the received optical signal. Equation (16) shows that ∆φ is determined by the delay length in the DLI and the wavelength (or carrier frequency) of the light emitted from the laser at the transmitter shown in Figure 1. Therefore, DLI devices should be able to be adjusted to reduce the influences of machining errors and adaptively match the received wavelength.…”

Section: Dpsk Modulation and Balanced Detectionmentioning

confidence: 99%

“…Because of the differences between phase retardations for different optical carrier frequencies, the spectral response should be tunable along the frequency axis while keeping the free spectral range (FSR) unchanged to match different channels in a dense wavelength division multiplexing (DWDM) system. As the development of digital processing technology continues, coherent detection methods based on high-speed analog-to-digital converters (ADC) and digital processors are being proposed [11][12][13][14][15][16]. Coherent detection provides better demodulation performance and high tolerance to chromatic dispersion and major nonlinear effects.…”

Section: Introductionmentioning

confidence: 99%

Intelligent Matching of the Control Voltage of Delay Line Interferometers for Differential Phase Shift Keying-Modulated Optical Signals

Zhou

Liang²

2021

Photonics

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In optical communications, differential phase shift keying (DPSK) provides a desired modulation format that offers high tolerance to nonlinear effects in high-speed transmissions. A DPSK demodulator converts the phase-coded signal into an intensity-coded signal at receivers. One demodulation scheme is called balanced detection and is based on a tunable delay line interferometer (DLI). Demodulation performances are determined by the phase delay generated by the DLI, while the phase delay is controlled by a tunable driving voltage on the DLI device. However, a problem in the dynamic adjustment of the control voltage prevents the application of DPSK demodulators. The receivers need to scan the whole control voltage range of the DLI and find the control voltage that maximizes the demodulation performance, but the scan-based method needs to undergo a very long searching time. In our work, we found that the relation between DLI control voltages and demodulation performance can be predicted rapidly by a feedforward neural network (FNN). In this paper, we propose a new method to quickly locate the best DLI control voltage based on an FNN. We also verify the proposed method in simulations and telecommunication systems, and the results show that the proposed method can significantly improve the efficiency of resolving the best demodulation voltages.

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“…The link spans 48 km but exhibits a total loss of 16 dB, comparable to DCI-type distances of 80 km. The Maxwell-Boltzmann probabilistic constellation shaping (PCS) of a 256-QAM format with an entropy of 7.5 bits/symbol is employed, as previously determined as a good choice for roughly 19 dB SNR [13].…”

Section: Field Trial Experimental Setupmentioning

confidence: 99%