Uncooled DWDM using orthogonal coding for low-cost datacommunication applications

We describe a novel dense wavelength-division multiplexed systems (DWDM) system where by introducing orthogonality between adjacent channels and by using overlapping arrayed waveguide grating filter profiles, laser transmitters may operate without the need for thermoelecric cooling. Compared with a traditional DWDMsystem, a power consumption saving of up to 68% may be realized using this scheme. Results of a proof-of-principle 100 Gb/s (10×10 Gb/s) experiments that use alternating NRZ and Manchester (CAP-2Q) modulation is reported.The authors would like to thank the Engineering and Physical Science Research Council (EPSRC) and Corning for awarding the author the grand prize best student paper at OFC 2014.This is the final published version. It first appeared at ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7024915

Uncooled MIMO DWDM using pulse-amplitude modulation and adaptive crosstalk cancellation

We present a proof-of-principle low-cost, uncooled, multiple-input-multiple-output (MIMO) dense wavelength division multiplexed (DWDM) system using advanced coding to allow for a greater stable operating region to be realized in terms of minimum channel spacing. For 400 GbE, a power consumption saving of 39% is estimated

Relaxed laser control of uncooled multiple-input and multiple-output dense wavelength-division multiplexing systems for low power consumption data communication links

A simulation based assessment is made of the benefits of using advanced modulation formats including Pulse Amplitude Modulation (PAM) and Carrierless Amplitude/Phase Modulation (CAP) to ease laser control requirements of a recently proposed novel uncooled Multiple-input and Multiple-output (MIMO) Wavelength-Division Multiplexing (WDM) system. At a per channel bit rate of 25 Gb/s, the spectral efficiency improvements inherent to these schemes provide additional optical system power margin over NRZ modulation (0.4 dB for PAM-4 and 4.4 dB for CAP-16) for a link distance of 20 km. This allows the minimum channel spacing between channels to be reduced from 0.4 nm (NRZ) to 0.3 nm for PAM-4 and to 0.14 nm for CAP-16, this in turn allowing for a more stable operating region to be realised. Compared with a traditional 16 x 25 Gb/s DWDM system, a power consumption saving of 30% can be realised using NRZ while PAM-4 and CAP-16 offer 29% and 27% savings respectively.RCUKThis is the author accepted manuscript. The final version is available from IEEE via http://dx.doi.org/10.1049/iet-opt.2014.000

Relaxed laser control of uncooled multiple-input and multiple-output dense wavelength-division multiplexing systems for low power consumption data communication links

A simulation-based assessment is made of the benefits of using advanced modulation formats including pulse amplitude modulation (PAM) and carrierless amplitude/phase modulation (CAP) to ease laser control requirements of a recently proposed novel uncooled multiple-input and multiple-output wavelength-division multiplexing (WDM) system. At a per channel bit rate of 25 Gb/s, the spectral efficiency improvements inherent to these schemes provide additional optical system power margin over non-return-to-zero (NRZ) modulation (0.4 dB for PAM-4 and 4.4 dB for CAP-16) for a link distance of 20 km. This allows the minimum channel spacing between channels to be reduced from 0.4 nm (NRZ) to 0.3 nm for PAM-4 and to 0.14 nm for CAP-16, this in turn allowing for a more stable operating region to be realised. Compared with a traditional 16 × 25 Gb/s dense WDM system, a power consumption saving of 30% can be realised using NRZ whereas PAM-4 and CAP-16 offer 29 and 27% savings, respectively

Uncooled orthogonal DWDM using discrete laser sources for low-cost datacommunication applications

We show experimentally and through simulations how discrete laser sources can be used in uncooled DWDM systems by exploiting orthogonal coding. This low-cost solution reduces power consumption over traditional DWDM systems by 49%

Uncooled DWDM using orthogonal coding for low-cost datacommunication applications

We describe a novel dense wavelength-division multiplexed systems (DWDM) system where by introducing orthogonality between adjacent channels and by using overlapping arrayed waveguide grating filter profiles, laser transmitters may operate without the need for thermoelecric cooling. Compared with a traditional DWDM system, a power consumption saving of up to 68% may be realized using this scheme. Results of a proof-of-principle 100 Gb/s (10 × 10 Gb/s) experiments that use alternating NRZ and Manchester (CAP-2Q) modulation is reported

100 Gb/s uncooled DWDM using orthogonal coding for low-cost datacommunication links

We demonstrate a 10 x 10 Gb/s uncooled DWDM system using orthogonal coding on adjacent carriers, assuming the use of a monolithically integrated sources. A power saving of 72% is expected over traditional WDM. © OSA 2014

MIMO DWDM system using uncooled DFB lasers with adaptive laser bias control and postphotodetection crosstalk cancellation

A proof-of-principle demonstration of a multiple input-multiple output (MIMO) dense wavelength division multiplexing (DWDM) system is reported. It uses standard uncooled distributed feedback lasers with intensity modulation-direction detection (IM-DD), in which the temperature of each laser is allowed to drift independently within a 50 °C temperature range. A feedback-based laser bias control algorithm is introduced to guarantee acceptable wavelength spacing and a postphotodetection minimum mean square error decoder is applied to cancel the interchannel crosstalk. The relative sensitivity of the MIMO receiver in both a random laser temperature drift scenario and a worst-case scenario are investigated by simulations in MATLAB. Experimental results for a 40-channel × 12.5 Gb/s DWDM system transmitting over 28 km of single-mode fiber with worst possible wavelength distribution prove the feasibility of the technique