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26 September 2007


Alcatel-Lucent reports integrated optoelectronics developments

In three post-deadline papers at the 33rd European Conference and Exhibition on Optical Communication (ECOC 2007) in Berlin, Germany last week, Alcatel-Lucent announced advances in optical network transmission via new integrated optoelectronics sources as well as a new receiver.

On the receiver side, Alcatel-Lucent researchers in Bell Labs of Crawford Hill, NJ, USA have demonstrated a compact optoelectronic receiver for differential quadrature phase-shift keying (DQPSK) reception that integrates an optical demodulator and four photodiodes on a single 3.2mm x 0.8mm indium phosphide-based chip. The firm says this gives a footprint that is more than two orders of magnitude smaller than typical current-generation DQPSK receivers where, in order to support advanced modulations formats, multiple components are connected by precise path lengths. The development could help to cut not only the size but also the cost of high-data-rate advanced-modulation-format optical transceivers, the firm claims.

On the emitter side, researchers from Alcatel-Thales’ III-V lab near Paris, France have demonstrated the first integrated version of a laser and an electro-absorption modulator (EML) with a record bandwidth of 60GHz - a step towards a next-generation 100Gb/s source for very short reach (VSR) transmission. Alcatel-Lucent claims that it is also a potential low-cost approach, since it has also demonstrated high operating temperature capability (43Gb/s up to 70°C, as reported at May’s International Conference on Indium Phosphide and Related Materials 2007 in Matsue, Japan).

Alcatel-Thales' III-V lab has also realized a 42GHz mode-locked laser source with a record wavelength tunability of 16nm, keeping constant both the output power and the narrow pulse width of 2ps. The firm says that this performance has been reached due to a new active layer made of quantum dots. Also, the optical pulses are Fourier-transform limited, which suits propagation in a fiber. These features collectively make such a laser attractive for very high-bit-rate tunable optical transmission, the firm claims.

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