Search results for: I H White
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Optical equalizers and electrical equalizers for a fiber link has been explicitly studied and compared. The results demonstrate that both can improve optical links significantly but optical equalizers can perform better in terms of noise enhancement.
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A quantitative analysis shows for the first time that a Clos-Beneš MZI-SOA based switch with a hybrid fibre-integration approach can achieve a record 2048 port count with 1.15 dB penalty when using soft decision FEC.
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In this work, the loss and bandwidth performance of flexible multimode polymer waveguides are investigated under different launch conditions. It is shown that bending excess loss below 2 dB is achieved for radii larger than 3 mm for a 50 µm MMF input, and twisting excess loss below 0.6 dB for up to 1 full 360-degree turn even for a relatively overfilled launch. The bandwidth studies reveal that bending...
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We demonstrate the first cascaded operation of integrated 4×4 hybrid MZI-SOA optical switches. Experimental studies emulate a 16×16 hybrid switch with 15dB IPDR for 1dB penalty and 43% reduced power consumption than equivalent SOA-based switches.
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We present a monolithically integrated mode-locked laser with integrated pulse-selector and power booster. High peak power (>1 W) pulses are generated with durations of 15.4 ps at a 55 MHz selected rate.
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We demonstrate a 16×2.5 Gb/s (40 Gb/s aggregate) OFDM-CDMA PON for next-generation access applications. Four-channel error-free transmission over 25 km SMF shows 6 dB coding gain, with 0.1 dB dispersion and 0.9 dB crosstalk penalties.
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Proof-of-principle coarse WDM transmission over SI-POF is demonstrated employing μLEDs, an APD receiver and PAM modulation. A record aggregate data rate of 11 Gb/s is achieved over 10 m of POF with a BER<10−3.
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In this work, we present recent advances in guided-wave VLC links enabling high-aggregate link capacities. In particular, the use of equalisation schemes, coarse wavelength division multiplexing (CWDM) and high-density waveguide arrays are discussed in the context of VLC systems and recent results are presented. It is shown that the use of simple electronic few-tap pre-equalisers can enable significant...
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Journal of Lightwave Technology > 2016 > 34 > 8 > 2049 - 2055
In this paper, feed-forward pre-equalization in conjunction with a PAM modulation scheme are proposed for use in wireless visible light communication (VLC) systems in order to enable the transmission of data rates >1 Gb/s. Simulation results demonstrate that simple few-tap feed-forward pre-equalization is able to remove the intersymbol interference caused by the limited link bandwidth of a line...
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Feed-forward pre-equalization is investigated to extend the transmission capability of μLED-based links, providing better receiver sensitivities up to 5dB compared with post-equalization. Error-free 2Gb/s free-space VLC over 0.6m is demonstrated using a PAM-4 modulated blue μLED and an APD receiver.
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We report a PAM-ECDMA PON system with 2.5-fold performance improvement over the prior NRZ-ECDMA system. Error-free transmission of two channels in an 8-user 25.6 Gb/s aggregate-data-rate PON is achieved in a proof-of-principle demonstration.
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Advanced modulation formats can enable >40 Gb/s data rates in waveguide-based optical interconnects without the need for high-specification optoelectronic components. Record 56Gb/s PAM-4 data transmission is demonstrated over a 1 m-long multimode polymer waveguide.
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A practical path-selection algorithm is proposed to optimize the worst-case path loss and IPDR for large-scale integrated switches. The modeling of an 8×8 Clos-tree switch shows an improvement of up to 2.7dB/1.9dB in loss/IPDR.
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The control tolerances of large-port-count optical switches with up to 128×128 ports using the MZI-SOA hybrid design are investigated. The first quantitative analysis is presented showing tolerant control requirements of the hybrid switch design.
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Optically-generated PAM schemes using μLED arrays are implemented for high-speed POF links for the first time. 6.25Gb/s PAM-16 transmission is demonstrated using 4 μLEDs, exhibiting 3.8dB greater power-margin than a link with a single μLED.
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Visible light communications (VLC) have attracted considerable research interest in recent years for use in both free-space and guided-wave optical links. In this paper, we review recent work on the development of guided-wave VLC links over plastic optical fibres (POF) and multimode polymer waveguides utilising micro-pixelated light-emitting diodes (μLEDs) and pulse amplitude modulation (PAM) schemes...
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In recent years, there has been much interest in the development of optical switches which can route optical signals from different input guides to different outputs based on thermo-optic and electro-optic technologies. Such switches, which can be reconfigured on millisecond and microsecond timescales, have already attracted commercial interest. However switches which are able to reconfigure on the...
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We demonstrate the first monolithically-integrated active-passive lossless 8×8 SOA switch. A wide IPDR of 14.5dB for penalty <1dB is achieved. The switch paths through the device exhibit excellent uniformity.
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We propose the first combined 4×100Gb/s hybrid multiband CAP-16 transmitter and QAM-16 receiver system and simulations show that it has 0.7 dBo (2.2 dBo) more power margin than 8×50Gb/s (4×100Gb/s) PAM-4 over DML (EML) SMF link.
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We report on a demonstration of a novel tunable WDM-PON system over 25km of field deployed fiber. We show error-free operation at 1GbE with sensitivity better than −30dBm and centralized control of the ONU wavelengths.
