| 1. |
- Lin, Rui, 1988, et al.
(författare)
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Embedding quantum key distribution into optical telecom communication systems
- 2019
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Ingår i: International Conference on Transparent Optical Networks. - : IEEE Computer Society. - 9781728127798 ; 2019-July
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Konferensbidrag (refereegranskat)abstract
- Quantum key distribution (QKD) together with one-time pad cryptography provides unconditional security for the sensitive information. However, the lack of telecom compatibility hinders massive deployment of QKD. In this talk we will discuss the approaches of embedding QKD in optical communication systems and the recent progress.
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| 2. |
- Oliari, Vinícius, et al.
(författare)
-
Regular perturbation for the weak-dispersion regime
- 2019
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Ingår i: 2019 21st International Conference on Transparent Optical Networks (ICTON). - 2161-2064 .- 2162-7339. - 9781728127798
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Konferensbidrag (refereegranskat)abstract
- The nonlinear Schrödinger equation (NLSE) takes into account the attenuation, the second order dispersion and the Kerr nonlinearities. No analytical solutions are known, and thus, approximations are required. In this paper, we approximate the NLSE by the regular perturbation on the second order dispersion. With this approximation, it is possible to represent some nonlinear regimes with high accuracy.
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| 3. |
- Ozolins, Oskars, et al.
(författare)
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Multilevel modulation at 100 gbaud for short reach C-band links
- 2019
-
Ingår i: International Conference on Transparent Optical Networks. - : IEEE Computer Society. - 9781728127798
-
Konferensbidrag (refereegranskat)abstract
- Datacenters experience an enormous traffic growth due to the vast amount of data to be stored, transmitted and processed [1]-[4]. Technical and economic challenges arise to keep up the bandwidth scalability. Therefore, cost-efficient short reach optical interconnects for 400 GbE intra-datacenter links are critical. Attractive solutions are proposed based on eight optical lanes thanks to compatibility with 100 GbE building blocks, where two optical lanes based 100 GbE solution is already being deployed [4]. Solutions for 400 GbE based on four optical lanes or even two optical lanes using high bandwidth components may be more attractive to reduce cost, power consumption and complexity of parallelism [5], [6]. In this talk, we report on several experimental demonstrations for short reach optical interconnects in C-band. We experimentally evaluate high-speed on-off keying (OOK) and 4-level pulse amplitude modulation (PAM4) and 8-level PAM8 transmitter performance in C-band for short reach optical interconnects. We demonstrate 100 Gbaud PAM4 transmission over 400 meters long standard single mode fiber without optical amplification. We also show results of numerical simulations showing achievable transmission reach in C-band for multilevel modulation at 100 Gbaud over standard single mode fiber with simple decision feedback equalizer. This paves the way for cost-effective short reach optical interconnects with multilevel modulation at 100 Gbaud and higher.
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| 4. |
- Udalcovs, Aleksejs, et al.
(författare)
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Towards 25+Gbpsλ IM-DD PON : NRZ, duobinary, PAM4, and DMT transmission and optical budget comparison
- 2019
-
Ingår i: International Conference on Transparent Optical Networks. - : IEEE Computer Society. - 9781728127798
-
Konferensbidrag (refereegranskat)abstract
- While infrastructure providers are expanding their portfolio to offer a sustainable solution for beyond 10 Gbps in optical access network segment, we compare experimentally several alternatives that may be used in future passive optical networks (PONs) to deliver 25+ Gbps net-rates. As promising candidates, we consider the intensity modulation direct detection (IM-DD) systems employing the following modulation formats: (i) duobinary, (ii) 4-level pulse amplitude modulation (PAM4), and (iii) discrete multitone (DMT), which are all more bandwidth efficient than the non-return-to-zero (NRZ) in current 10G PON solutions. In this paper, we focus on the optical budget after transmission over a 20 km single-mode fiber (SMF) link in C-band and discuss the intrinsic imperfections of optical components that may significantly reduce the received signal quality.
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