OPTCOM–A 100 Gbit/s transceiver demonstrator project (original) (raw)
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OptCom - a 100 Gbit/s transciever demonstrator project
2003
This presentation is about a 100 Gbit/s demonstrator project in its early stage. Our focus is to present our project activities, and – at the oral presentation – highlight with a few examples from different subprojects. The project consists of activities in the following areas: high-speed electronics, assembly technology, optical components, and fibre-optical transmission. The project is a joint project with industry, where Optillion is the industrialand Chalmers is the academic partner. A corresponding project exists also at KTH, which focus on optical modulators.
Advanced Photoreceivers for High-Speed Optical Fiber Transmission Systems
IEEE Journal of Selected Topics in Quantum Electronics, 2010
The increasing demand for higher transmission capacity over the existing optical fiber infrastructures raises the interest in using more efficient optical modulation formats supported by new challenging component technologies. This paper describes the current status of integrated photoreceivers, thus highlighting the relationship between sophisticated optical transmission requirements and feasible technology achievements. Index Terms-Coherent detection, differential phase shift keying (DPSK), differential quadrature phase-shift keying (DQPSK), integrated photoreceiver, optical fiber transmission, optoelectronic module, waveguide photodiode (WG-PD). I. INTRODUCTION T HE RAPIDLY increasing delivery of broadband services, such as video on demand and the deployment of broadband access networks with Terabit capacity by major telecom carriers drive the need for more bandwidth in the optical network. Dense wavelength-division multiplexing (DWDM) systems with 40 Gb/s channel capacity are widely deployed by major telecommunications carriers to use the existing fiber infrastructure most efficiently. For long-haul transport systems, transmission formats, such as optical duobinary (ODB) and differential phase-shift keying (DPSK) are employed to achieve 40-G reach performance over the existing 10-G infrastructure. Differential quadrature phase-shift keying (DQPSK) has been shown to allow for higher tolerance against fiber impairments and is therefore envisaged for 43-G applications in networks with legacy fiber. The high-capacity Internet exchange optical networking centers are continuously demanding higher traffic capacity and the current access technology will be soon reaching its capacity limits. These very short reach (VSR) interconnects require spaceand power-efficient high bit rate technologies. This demand is the key driver for the current standardization efforts at the IEEE higher speed study group for higher data rates. One hundred Gigabit Ethernet has been thoroughly investigated and has recently been deployed in experimental field trials by carriers and equipment manufacturers. Paral-Manuscript
100/1000 Gbit/s Ethernet and beyond
100 Gbit/s Ethernet is foreseen in metro and access by 2014, while 1 Tbit/s Ethernet is forecasted for trunk links before 1020. This paper reviews the advantages and constraints of the optical networking and discusses how they meet the 100 Gbit/s Ethernet needs.
Enabling 160Gbit/s Transmitter and Receiver Designs
2005
The field of ultra high-speed (≥160Gb/s) transmission has developed rapidly over the past years from proof-of-principle demonstrations towards advanced field trial applications. We review recent trends in 160Gb/s signal generation and detection techniques. Ó2005 Optical Society of America OCIS codes: (060.2330) Fiber optics communications, (190.4380) Nonlinear optics, (060.5060) Phase modulation
2020
Existing transceiver technology inside data centers will soon reach its limits due to the enormous traffic growth rates driven by new, bandwidth-hungry applications. Efforts to develop the next generation of 800Gbps and 1.6Tbps transceivers for intra-DC optical interconnects have already kicked-off to address the demands in traffic, the exhaustion of the ports at the digital switches and the power consumption limitations inherent to the use of many lower capacity modules. The new generation of optical modules must also provide Terabit capacities at low cost, necessitating the use of high-volume manufacturing processes. TERIPHIC is an EU funded R and D project that aims at developing transceiver modules with up to 1.6 Tbps capacity over 16 lanes in duplex fiber and cost less than 1 € per Gbps for distances up to 2 km, utilizing PAM-4 modulation for 100Gbps per lane and high-volume production compatible transceiver designs. At the component level, TERIPHIC will rely on arrays of high-...
Solutions for 100/400-Gb/s Ethernet Systems Based on Multimode Photonic Technologies
Journal of Lightwave Technology, 2017
In this article, we experimentally demonstrate the transmission of 112 Gb/s four-level pulse amplitude modulation (PAM-4) over 100-m OM4 multi-mode fiber (MMF) employing a multi-mode 850-nm vertical-cavity surface-emitting laser (VCSEL) at the transmitter side and equalization techniques at the receiver's digital signal processing (DSP). The penalties imposed by the strong bandwidth limitations due to the optical components as well as the low modal bandwidth of the fiber are compensated by three variant DSP schemes at the receiver i.e., i) a finite-impulse response (FIR) filter, ii) a maximum likelihood sequence estimation equalizer (MLSE), and ii) an FIR filter followed by an MLSE equalizer (FIR/MLSE) in cascaded form. We evaluate all three aforementioned equalization schemes under two different transmitter implementations, i.e., employing a 30-GHz arbitrary waveform generator (AWG) and a lower bandwidth 15-GHz commercially available DAC and we infer about the applicability of each DSP scheme under these implementations. We show that the hybrid implementation of an FIR followed by a 16-state MLSE can enable the 100-m transmission below the 7% hard-decision (HD) forward error correction (FEC) threshold limit and outperforms its other two counterparts for the back-to-back case as well as after 100-m transmission for the high bandwidth transmitter implementation. On the other hand, lower bandwidth DAC implementations i.e., 15 GHz, require an increased states MLSE without the need for a preceding FIR filter to bring the BER below the HD-FEC limit after 100-m OM4 fiber transmission. DSP complexity vs. BER performance is assessed for all aforementioned scenarios evaluating the impact of the transmitter's bandwidth on the overall system's performance. Our proposed solutions show that 112 Gb/s 100-m OM4 multi-mode links based on VCSELs and standard OM4 fiber can enable next generation 100 Gb/s and 400 Gb/s wavelength division multiplexed (WDM) optical interconnects.
Compact and efficient modulators for 100 Gb/s ETDM for telecom and interconnect applications
Applied Physics A, 2009
State of the art and prospects regarding semiconductor compact modulators and transmitters for on-off keying and more advanced modulations formats for output bitrates of 100 Gb/s and above are discussed. The implementation of a monolithically integrated transmitter comprising laser and light-intensity modulator is described and the prospects for a fully integrated transmitter for more advanced modulation formats elucidated, all for 100 Gb/s output bitrate PACS 85.30.-z · 85.60.-q · 42.82.-m
Journal of Lightwave Technology, 2017
Electrical duobinary modulation is considered as a promising way to realize high capacity because of the low bandwidth requirement on the optical/electrical components and high tolerance towards chromatic dispersion. In this paper, we demonstrate a 100 Gb/s electrical duobinary transmission over 2 km standard single-mode fibre reaching a bit error rate under 7% HD-FEC threshold with the use of PRBS-7. This link is tested in real-time without any form of digital signal processing. Inhouse developed SiGe BiCMOS transmitter and receiver ICs are used to drive an electro-absorption modulated laser and decode the received signal from a PIN-photodiode. The performance of 50 Gb/s and 70 Gb/s non-return-to-zero and electrical duobinary transmission are investigated for comparison. Index Terms-Electrical duobinary, Optical communication, Analog equalization I. INTRODUCTION T HE continuous growth of the internet traffic is boosting the requirement of ultra-high-speed optical interconnects for data centres, which is largely driven by bandwidthconsuming applications, such as cloud computing, high definition video and Internet of Things. Currently the evolution from 100 Gb/s Ethernet to 400 Gb/s is under discussion within the IEEE P802.3bs 400 Gigabit Ethernet Task Force [1]. Among different approaches, the four lane 100 Gb/s scheme is particularly attractive for 500 m and 2 km single-mode fibre applications as it allows lower lane counts, thus offering higher spatial efficiency. For the intra-datacenter communication, avoiding complex transceivers is crucial in terms of cost and power consumption. Consequently, intensity modulation and direct detection (IMDD) links are preferred rather than coherent transmission technologies. On-off keying (OOK) [2] Manuscript received ...; revised ... (M. Verplaetse and R. Lin contributed equally to this work).
Fabrication of a low-cost module for Gigabit Ethernet transceivers
Proceedings of Spie the International Society For Optical Engineering, 2003
In this paper, a novel way for the fabrication of opto-electronic transceiver modules is proposed. These modules are characterized by the use of MT-RJ connectors, low-cost fabrication tools, highly efficient opto-electronic components such as VCSELs and CMOS integrated detectors, and an easy fabrication scheme. The module is based on the direct alignment technique; this means that the fibre and the photo detector and laser diode are self and directly aligned with respect to each other, without the need for optical lenses. Cost are expected to be low, since the transceiver module can be fabricated using existing mass volume fabrication techniques
—100 Gigabit Ethernet (100 GbE) is widely envisioned as the next-generation Ethernet, driven by continued capacity growth in provider networks, new emerging high-bandwidth applications, and an evolutionary trend from TDM to packet transport, particularly in the Metro space. We will describe some key application areas where 100 GbE will probably be employed first. We further discuss possible implementations on the physical layer (PHY) and argue for the need of an efficient framer and against a Medium Access Controller (MAC). Particularly for MANs and WANs, the most prominent candidate for the required framing will be based on the Optical Transport Network (OTN, ITU-T G.872/G.709). 100 GbE will be an IEEE 802.3 standard and will hence only define the access control of and the transport on the physical sublayer. However, the challenges for realizing 100 GbE are related to Ethernet switching and not to Ethernet transport.