Alcatel-Lucent announces new integrated optoelectronics sources…

On the receiver side, Alcatel-Lucent researchers in Bell Labs' Crawford Hill, NJ facility demonstrated a novel compact optoelectronic receiver for differential quadrature phase-shift keying (DQPSK) reception that may ultimately contribute to reducing the cost and size of high-data-rate advanced-modulation-format optical transceivers

In contrast to the current generation of receiver technologies where multiple components must be connected together with precise path lengths in order to support advanced modulations formats, this technology integrates an optical demodulator and four photodiodes on a single 3.2 mm x 0.8 mm InP (Indium Phosphide)-based chip - producing a single integrated optoelectronic device that has a footprint that is more than two orders of magnitude smaller than today's typical DQPSK receivers.

On the emitter side, Alcatel-Lucent's researchers from Alcatel-Thales III-V lab, France, have demonstrated the first integrated version of a laser and an electro-absorption modulator (EML) with a record bandwidth of 60 GHz. This result is a major step toward the next generation 100Gb/s source for Very Short Reach (VSR) transmission. In addition, this is also a potential low cost approach since we have also demonstrated its high operating temperature capability (43 Gb/s up to 70°C, IPRM 07)

Finally, Alcatel-Lucent's researchers from Alcatel-Thales III-V lab, France, have realized a 42 GHz mode-locked laser source with a record wavelength tunability of 16nm, keeping constant both the output power and the narrow pulse width of 2 picoseconds. These performances have been reached thanks to a new active layer made of Quantum Dots. In addition, the optical pulses are Fourier-transform limited, which is quite suitable for propagation in the fiber : these features make such a laser very attractive for very high bit rate tunable optical transmission.

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