Lasing in metallic-coated nanocavities Hill, Martin T; Oei, Yok-Siang; Smalbrugge, Barry ...
Nature photonics,
10/2007, Volume:
1, Issue:
10
Journal Article
Peer reviewed
Metallic cavities can confine light to volumes with dimensions considerably smaller than the wavelength of light. It is commonly believed, however, that the high losses in metals are prohibitive for ...laser operation in small metallic cavities. Here we report for the first time laser operation in an electrically pumped metallic-coated nanocavity formed by a semiconductor heterostructure encapsulated in a thin gold film. The demonstrated lasers show a low threshold current and their dimensions are smaller than the smallest electrically pumped lasers reported so far. With dimensions comparable to state-of-the-art electronic transistors and operating at low power and high speed, they are a strong contender as basic elements in digital photonic very large-scale integration. Furthermore we demonstrate that metallic-coated nanocavities with modal volumes smaller than dielectric cavities can have moderate quality factors.
•HPC, on-board, industrial and automotive applications require operation at high temperatures.•We analyze 850 nm Quantum Dot VCSELs, capable of high-speed operation at extreme temperatures.•QD VCSELs ...show SM polarized emission and a unique feature of increasing bandwidth with temperature.•Record high speed operation is demonstrated, from 56 Gbit/s at 85 °C to 25 Gbit/s at 150 °C.
We report on subharmonic optical clock recovery (OCR) at 10 GHz from 160-Gb/s optical time-division multiplexed signals. The OCR circuit is based on a passively mode-locked principle in a fiber ring ...laser that utilizes fast gain dynamics of a linear semiconductor optical amplifier. To decrease the jitter amount in the clock pulse considerably, postelectrical signal processing is performed. The recovered clock is a 1.8-ps 10-GHz pulse train with 0.37 pulsewidth-bandwidth product.
We demonstrate an all-optical label and payload separator based on nonlinear polarization rotation in a semiconductor optical amplifier. The proposed scheme uses a variable packet length composed of ...a label and payload information signal modulated intensity modulation and differential phase-shift keying (DPSK) format, respectively. The separation is obtained by using the payload signal itself, exploiting the DPSK feature of being power constant, as a pumping light source. Therefore, the proposed scheme is asynchronous and does not need an external control signal.
Clock recovery (CR) from a 160-Gb/s data signal is demonstrated using a single unidirectional electroabsorption modulator in a cost-effective phase-locked loop configuration consisting entirely of ...commercially available components. The CR exhibits a root mean square time jitter of 205 fs, a holding range of 10 MHz, a wavelength-independent performance of 10 nm, and an input dynamic range of 10 dB. Demultiplexing experiments of transmitted 160-Gb/s data through installed fiber links over 275.4 km verified the excellent performance of the proposed CR. All 16 10-Gb/s channels were demultiplexed error-free.
G.652 standard single-mode fiber (SSMF) is today considered as the most efficient solution to transport 40 Gbps and 100 Gbps data traffic over ultra long-haul distances on terrestrial transport ...networks. In the early 2000s, there was a trend to replace legacy G.652 fibers, which were strongly impaired by polarization mode dispersion (PMD), by G.655 fibers. For economic reasons, incumbent operators decided to keep their legacy G.652 fiber infrastructure, while replacing gradually the most impaired fibers by low PMD G.652 fibers over the links transporting the highest amount of traffic. In this context, we performed in 2009 an experimental evaluation of the performance of a new ultra low loss (ULL) and low PMD G.652 fiber to carry 40 Gbps WDM systems over ultra long-haul distances by using various modulation formats (NRZ-OOK and NRZ-DPSK) and amplification schemes (hybrid Raman-EDFA and EDFA only). We demonstrated record transmission distance of 4400 km at 40 Gbps line rate when NRZ-DPSK was combined with hybrid Raman-EDFA amplification. We complete here this previous study with new results, coming in particular from an extensive experimental and numerical comparison of the transmission performance of this new ULL G.652 fiber with the legacy G.652 fiber, used in the field for 20 years. We demonstrate in particular that this new SMF-28 ® ULL optical fiber increases the maximum transmission reach by ~30%, whatever the amplification scheme, when NRZ-DPSK is used.
160 Gb/s OTDM networking using deployed fiber Turkiewicz, J.P.; Tangdiongga, E.; Lehmann, G. ...
Journal of lightwave technology,
2005-Jan., 2005-1-00, Volume:
23, Issue:
1
Journal Article
Peer reviewed
Open access
This paper reports a 160-Gb/s OTDM network comprising switching and demultiplexing through field deployed fiber. The 160-Gb/s signal was obtained by time-interleaving 16 channels of a 10-Gb/s signal. ...The add-drop node was realized by using a gain-transparent operation of a semiconductor optical amplifier (SOA). A subharmonic clock recovery with a prescaled electrooptical phase locked loop employing an electroabsorption modulator was applied. An OTDM receiver employed a four-wave mixing principle in an SOA. The impact of fiber chromatic and polarization-mode dispersion (PMD) is discussed. Switching and demultiplexing performance are shown for a fiber link of 275 and 550 km, respectively. Excellent operation of clock recovery, drop-through-add function, and transmission was achieved.
The results of studies on fabrication of vertical-cavity surface-emitting 1.55-μm lasers by fusing AlGaAs/GaAs distributed-Bragg-reflector wafers and an active region based on thin In
0.74
Ga
0.26
As ...quantum wells grown by molecular-beam epitaxy are presented. Lasers with a current aperture diameter of 8 μm exhibit continuous lasing with a threshold current below 1.5 mA, an output optical power of 6 mW, and an efficiency of approximately 22%. Single-mode lasing with a side-mode suppression ratio of 40–45 dB is observed in the entire operating current range. The effective modulation frequency of these lasers is as high as 9 GHz and is limited by the low parasitic cutoff frequency and self-heating.
We propose and evaluate performance of the higher order mode filter for 850 nm multimode fiber transmission. The developed passive component reduces impact of mode dispersion on the systems ...performance. Excellent operation in the 850 nm transmission experiments is shown.
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