DAC-free Generation of M-QAM Signals with InP Segmented Mach-Zehnder Modulators

Schell, Martin; Fiol, G.; Aimone, Alessandro

doi:10.1364/ofc.2017.w4g.4

Cited by 2 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have introduced in ( 19) perfect constellations as max-full-scale (LSB = −1, LSB = 1) equi-spaced ones. For coherent transmission the COH C-PAM perfect constellation (with increment 2 2 B −1 ):…”

Section: Biwgt Mpmzm As Energy-efficient Generator Of Inherently Perfect Coherent (Bipolar) Pammentioning

confidence: 99%

“…As seen in (72), a perfect PAM4 COH constellation, 2 3 , is generated based on the dyadic matched taps design:…”

Section: Coh Pam4 Mpmzms-the Matched Taps Perfect Designmentioning

confidence: 99%

“…3 , 1 3 , 1} with largest possible min-distance, 2 3 , is generated based on the dyadic matched taps design: COH PAM4 matched taps :…”

Section: Coh Pam4 Mpmzms-the Matched Taps Perfect Designmentioning

confidence: 99%

“…The variable 1:2 splitter and variable 2:1 combiner may each be realized as a single slowly tunable MZM. The C&C system tune the taps of the matched variable splitter and combiner to realize fan-out and fan-in power ratios of 2 3 : 1 3 .…”

Section: Coh Pam4 Mpmzms-the Matched Taps Perfect Designmentioning

confidence: 99%

“…But we now have a single tap to control, not two. Another fixed tap option is designing and fabricating the fixed splitter (e.g., a directional coupler) not at 50:50 split but rather aiming for ideal 2 3 : 1 3 power ratio (73) (consistent with the matched splitter and combiner taps design, both being 2 3 : 1 3 ). The penalty, for slightly deviating from the nominal ratio, may be shown to be quite low.…”

Section: Fixed 50-50 Tap Coh Pam4 Mpmzm-reduced Complexity Designmentioning

confidence: 99%

See 4 more Smart Citations

Accurate Power-Efficient Format-Scalable Multi-Parallel Optical Digital-to-Analogue Conversion

Nazarathy

Tomkos

2021

Photonics

View full text Add to dashboard Cite

In optical transmitters generating multi-level constellations, optical modulators are preceded by Electronic Digital-to-Analog-Converters (eDAC). It is advantageous to use eDAC-free Optical Analog to Digital Converters (oDAC) to directly convert digital bitstreams into multilevel PAM/QAM optical signals. State-of-the-art oDACs are based on Segmented Mach-Zehnder-Modulators (SEMZM) using multiple modulation segments strung along the MZM waveguides to serially accumulate binary-modulated optical phases. Here we aim to assess performance limits of the Serial oDACs (SEMZM) and introduce an alternative improved Multi-Parallel oDAC (MPoDAC) architecture, in particular based on arraying multiple binary-driven MZMs in parallel: Multi-parallel MZM (MPMZM) oDAC. We develop generic methodologies of oDAC specification and optimization encompassing both SEMZM and MPMZM options in Direct-Detection (DD) and Coherent-Detection (COH) implementations. We quantify and compare intrinsic performance limits of the various serial/parallel DD/COH subclasses for general constellation orders, comparing with the scant prior-work on the multi-parallel option. A key finding: COH-MPMZM is the only class synthesizing ‘perfect’ (equi-spaced max-full-scale) constellations while maximizing energy-efficiency-SEMZM/MPMZM for DD are less accurate when maximal energy-efficiency is required. In particular, we introduce multiple variants of PAM4|8 DD and QAM16|64 COH MPMZMs, working out their accuracy vs. energy-efficiency-and-complexity tradeoffs, establishing their format-reconfigurability (format-flexible switching of constellation order and/or DD/COH).

show abstract

Section: Biwgt Mpmzm As Energy-efficient Generator Of Inherently Perfect Coherent (Bipolar) Pammentioning

confidence: 99%

“…As seen in (72), a perfect PAM4 COH constellation, 2 3 , is generated based on the dyadic matched taps design:…”

Section: Coh Pam4 Mpmzms-the Matched Taps Perfect Designmentioning

confidence: 99%

“…3 , 1 3 , 1} with largest possible min-distance, 2 3 , is generated based on the dyadic matched taps design: COH PAM4 matched taps :…”

Section: Coh Pam4 Mpmzms-the Matched Taps Perfect Designmentioning

confidence: 99%

Section: Coh Pam4 Mpmzms-the Matched Taps Perfect Designmentioning

confidence: 99%

Section: Fixed 50-50 Tap Coh Pam4 Mpmzm-reduced Complexity Designmentioning

confidence: 99%

See 3 more Smart Citations

Accurate Power-Efficient Format-Scalable Multi-Parallel Optical Digital-to-Analogue Conversion

Nazarathy

Tomkos

2021

Photonics

View full text Add to dashboard Cite

show abstract

A Vision of 6th Generation of Fixed Networks (F6G): Challenges and Proposed Directions

Uzunidis,

Moschopoulos,

Papapavlou

et al. 2023

Telecom

View full text Add to dashboard Cite

Humankind has entered a new era wherein a main characteristic is the convergence of various technologies providing services and exerting a major impact upon all aspects of human activity, be it social interactions with the natural environment. Fixed networks are about to play a major role in this convergence, since they form, along with mobile networks, the backbone that provides access to a broad gamut of services, accessible from any point of the globe. It is for this reason that we introduce a forward-looking approach for fixed networks, particularly focused on Fixed 6th Generation (F6G) networks. First, we adopt a novel classification scheme for the main F6G services, comprising six categories. This classification is based on the key service requirements, namely latency, capacity, and connectivity. F6G networks differ from those of previous generations (F1G–F5G) in that they concurrently support multiple key requirements. We then propose concrete steps towards transforming the main elements of fixed networks, such as optical transceivers, optical switches, etc., such that they satisfy the new F6G service requirements. Our study categorizes the main networking paradigm of optical switching into two categories, namely ultra-fast and ultra-high capacity switching, tailored to different service categories. With regard to the transceiver physical layer, we propose (a) the use of all-optical processing to mitigate performance barriers of analog-to-digital and digital-to-analog converters (ADC/DAC) and (b) the exploitation of optical multi-band transmission, space division-multiplexing, and the adoption of more efficient modulation formats.

show abstract

DAC-free Generation of M-QAM Signals with InP Segmented Mach-Zehnder Modulators

Cited by 2 publications

References 1 publication

Accurate Power-Efficient Format-Scalable Multi-Parallel Optical Digital-to-Analogue Conversion

Accurate Power-Efficient Format-Scalable Multi-Parallel Optical Digital-to-Analogue Conversion

A Vision of 6th Generation of Fixed Networks (F6G): Challenges and Proposed Directions

Contact Info

Product

Resources

About