Product category: Optoelectronic Sensors, Switches and Receivers
News Release from: Bookham | Subject: 40Gbit/s EAM module
Edited by the Electronicstalk Editorial Team on 17 March 2003
Top performance from electro-absorption modulator
A paper at the Optical Fibre Communication Conference and Exposition describes a novel 40Gbit/s electro-absorption modulator (EAM) module with unequalled performance
Bookham Technology will present a paper at the Optical FiberCommunication Conference and Exposition that describes a novel40Gbit/s electro-absorption modulator (EAM) module withunequalled performance. Based on the Franz-Keldysh effect (FKE),the EAM device has the lowest unamplified insertion loss everreported for an EAM, the lowest polarisation-dependent loss (PDL)over a wide range of wavelengths, and the highest bandwidth for alumped-element FKE-EAM.
This article was originally published on Electronicstalk on 17 March 2003 at 8.00am (UK)
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All these performance parameters areachieved simultaneously, with a manufacturable design, whilemaintaining the practical requirement of over 10dB extinctionwith a voltage swing of under 2.5V.
'This modulatoremphasises Bookham's forward-looking commitment to realiseand evaluate the potential of advanced optical technologies forour customers', says Kelvin Prosyk, Senior Researcher,Bookham Technology and joint author of the OFC paper describingthe device.
'We now have the technology to build theworld's best EAM for high-speed systems - and this is acomplete, single package integrating all the necessary 40Gbit/sRF functions, which is a hard problem.
Given that Bookham alreadyhas the world-leading 10Gbit/s InP Mach-Zehnder modulator, thisgives us a unique understanding of the respective potentials ofthe two approaches to high-speed modulators.
Certainly, there isnothing between them in terms of size, but the InP laserMach-Zehnder continues to outclass the EAM in 10Gbit/s systemperformance'.
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The InP-based EAM device has a bulk activeabsorption core, which is inherently simple to fabricate andconsequently gives high yields.
This design also gives thenear-zero chirp needed for the dispersion compensation of40Gbit/s operation on standard single-mode-fibre links with spansof over about 8km.
This attribute is relevant to otherapplications of high-speed EAMs, such as the data gating of atrain of pulses.
In this case, some pulse clipping will occurwith anything other than an ideal square gate, thus making lowchirp a necessity.
Integrated spot-size convertors (SSCs), alsoused in Bookham's InP laser Mach-Zehnder modulators, are akey aspect of the design, as they enable tight device integrationand small package size by improving the laser-modulator opticalcoupling and consequently power throughput.
The SSCs are designedto enable low loss, low PDL and good alignment tolerance whencoupled to microlenses.
The EAM chip is mounted on a ceramic,gold-coated subcarrier with a 50ohm coplanar termination.
Thesubcarrier, in turn, rests on a thermoelectric cooler with athermistor temperature monitor.
Standard single-mode fibre (SMF)pigtails are lens coupled to the input and output SSCs of theEAM.
The resulting EAM device has a usable bandwidth of 50GHz.
At1540nm, the fibre-to-fibre insertion loss is 4dB whilemaintaining an extinction ratio of better than10dB at 2.5V.
At1550nm, the insertion loss falls to 3.6dB, which is the lowest sofar reported for an EAM.
The polarisation-dependent loss (PDL) isless than 0.3dB over the entire dynamic range at 1540nm, and lessthan 0.6dB from 1530 to 1550nm, which is the lowest PDL everreported for an EAM over a wide wavelength range.
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