Coherent versus Kramers-Kronig Transceivers in Metro Applications: A Power Consumption Perspective

Bo, Tianwai; Kim, Hoon

doi:10.1364/ofc.2019.m1h.7

Cited by 18 publications

(4 citation statements)

References 8 publications

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“…Nonlinear equalizer based on Volterra [ 36–39 ] and look‐up table (LUT) [ 40–45 ] can be used to compensate for nonlinear noise in transmission. Kramers‐Kronig (KK) algorithm can reduce signal‐signal beat interference (SSBI) caused by the photoelectric detection (PD), square detection characteristics [ 46–50 ] . Using pre‐equalization (Pre‐EQ) [ 51–57 ] and decision‐directed least‐mean‐square (DD‐LMS) equalization can effectively improve receiver sensitivity [ 58,59 ] .…”

Section: Introductionmentioning

confidence: 99%

Digital Signal Processing for High‐Speed THz Communications

Wei

2022

Chinese J of Electronics

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The use of advanced digital signal processing (DSP) technology in the high‐speed terahertz (THz) communication can effectively compensate the linear and nonlinear effects of the system and further improve the transmission performance of the system. This paper introduces the principle and application of advanced DSP algorithms such as probability shaping (PS) technology, Volterra series nonlinear compensation algorithm, Kramers‐Kronig receiver, look‐up table (LUT) pre‐distortion compensation technology, pre‐equalization and decision‐directed least‐mean‐square equalization algorithm. Combined with DSP algorithms such as PS and LUT pre‐distortion, using photon‐assisted technology to successfully realize the wireless transmission of vector THz signals higher than 1 Tbit/s on the sub‐THz band (D‐band) 4 × 4 multiple input multiple output system.

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Section: Introductionmentioning

confidence: 99%

Digital Signal Processing for High‐Speed THz Communications

Wei

2022

Chinese J of Electronics

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“…1 shows, and when the information bit rate is constant, the spectral efficiency will change with different frequency gap and the roll-off factor as Table . I shows. Secondly, a higher digital upsampling rate and CSPR mean a higher computational complexity and power consumption [17], [28], [29]. Thirdly, the tap number of the HT-FIR filter determines the level of the Gibbs phenomenon, which is directly related to the performance of KK phase retrieval.…”

Section: Introductionmentioning

confidence: 99%

Practical Kramers-Kronig Phase Retrieval FIR Filter With the Gibbs Phenomenon

Liu

Song

et al. 2022

J. Lightwave Technol.

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“…It is also intrinsically "real time", as it is very difficult to implement random-access memory in analog form. There may also be a power consumption advantage, as KK-processing uses a large proportion of a receiver's power [26]. For bandwidths of around a gigahertz, analog processing is possible using off-the shelf chips, though much-higher bandwidths are of course possible using custom chip designs as are routinely used in optical transceivers or microwave systems.…”

Section: Introductionmentioning

confidence: 99%

Analog Low-Latency Kramers-Kronig optical Single-Sideband Receiver

Lowery

Feleppa

2021

J. Lightwave Technol.

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Kramers-Kronig (KK) receivers have been shown to be able to cancel the signal-signal beat interference that occurs upon direct-photodetection in optical single-sideband systems, where the transmitted optical field is proportional to the modulation signal (Field-Modulated Direct-Detection systems). They can support complex modulation formats, and being singlesideband, electronic dispersion compensation, without the need for a coherent receiver. All current research has used digital-signal processing (DSP) to implement the KK algorithm.Radio-frequency KK receivers using analog processing were first introduced in the 1960's, and offer an alternative to DSP, particularly in their approximate form. Analog processing is inherently real-time and offers the lowest latency (processing delay). In this paper, we show that with minor changes, analog processing can also be used with signals from a photodetector. We have built an experimental receiver, using standard parts that have functionality that approximates to the desired algorithm. In particular, we show that a differential pair of bipolar transistors can approximate a square-root function, that the Hilbert transform can be approximated by an 8-tap transmission-line delay, and that a commercial analog multiplier chip can be used for a squaring and subtraction function.The system is demonstrated with 16-QAM at 500 Mbit/s with the photocurrent emulated in software and the KK algorithm performed in hardware. Finally, software band-limits the signal, down-converts it to form a constellation, and calculates symbol error rates. We show that the analog KK reduces the symbol error rate by at least a factor of ten, enabling low carrier-to-signal power ratios to be used with standard forward error correction. Much higher data rates could be supported using customdesigned microwave ASICs, which could be incorporated in packaged receivers. This would enable miniaturized receivers using standard DSP to work with dispersion-limited links. Interestingly, half the benefit could be gained by simply re-biasing the differential stage of a standard photoreceiver.

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Coherent versus Kramers-Kronig Transceivers in Metro Applications: A Power Consumption Perspective

Cited by 18 publications

References 8 publications

Digital Signal Processing for High‐Speed THz Communications

Digital Signal Processing for High‐Speed THz Communications

Practical Kramers-Kronig Phase Retrieval FIR Filter With the Gibbs Phenomenon

Analog Low-Latency Kramers-Kronig optical Single-Sideband Receiver

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