Telecoms ♦ news digest
in 2014, Oclaro is now expanding its investment in manufacturing and testing capacity to stay ahead of the market demand.
Oclaro is offering a CFP2 that is fully-interoperable with existing CFP transceivers supporting both OTU-4 and 100GbE interfaces. The support of ‘dual-rate operation’ is critical to customers who demand the flexibility to use the product both in native Ethernet and OTN transport environments. The CFP2 dual-rate operation is made possible by leveraging the superior efficiency of the Oclaro InP Distributed Feedback laser (DFB) structure.
In addition, at OFC 2014, Oclaro is unveiling a disruptive technical solution to further expand the reach of CFP2 up to 40km. By eliminating the power-hungry Semiconductor Optical Amplifier (SOA) used in previous IEEE 100GBASE-ER4 products, power consumption can be drastically reduced to allow for the transition to a smaller form factor such as CFP2.
With the adoption of 100G from core networking into access, customers demand products that can reach beyond the LR4 10km standard.
At the show, Oclaro is demonstrating interoperability between 100G CFP2 and 25Gbps APD ROSA on a 40km transmission link.
Oclaro is planning to formally introduce this new extended reach APD-based CFP2 in 2H 2014.
The CFP2 LR4 transceivers are fully qualified and now in volume production.
Data-transfer speeds reach new heights
SiGe and VCSELs combined could lead to a new era in short-range data transmission
Researchers at IBM have set a new record for data transmission over a multimode optical fibre, a type of cable that is typically used to connect nearby computers within a single building or on a campus. The achievement demonstrated that the standard, existing technology for sending data over short distances should be able to meet the growing needs of servers, data centers and supercomputers through the end of this decade, the researchers said.
Sending data at a rate of 64 gigabits per second (Gb/s) over a cable 57 meters long using aVCSEL, the researchers achieved a rate that was about 14 percent faster than the previous record and about 2.5 times
faster than the capabilities of today’s typical commercial technology.
In the foreground are 2 Chalmers VCSELs. The one on the left has a 6um aperture and could operate error free up to 62Gb/s while the one on the right has a 5um aperture and set the equipment limited record of 64Gb/s. Behind the two VCSELs is IBM’s BiCMOS8HP VCSEL driver IC. On either side of the IC are the decoupling capacitors and connecting wirebonds. (Credit: IBM)
To send the data, the researchers used standard non- return-to-zero (NRZ) modulation. “Others have thought that this modulation wouldn’t allow for transfer rates much faster than 32 Gb/s,” notes researcher Dan Kuchta of the IBM T.J. Watson Research Centre in New York.
Many researchers thought that achieving higher transmission rates would require turning to more complex types of modulation, such as pulse-amplitude modulation-4 (PAM-4).
“What we’re showing is that that’s not the case at all,” Kuchta continues. Because he and his colleagues achieved fast speeds even with NRZ modulation, he added, “this technology has at least one or two more generations of product life in it.”
To achieve such high speeds, the researchers used the VCSELs developed at Chalmers University of Technology in Sweden and custom SiGe chips developed at IBM Research. “The receiver chip is a unique design that simultaneously achieves speeds and sensitivities well beyond today’s commercial offerings,” Kuchta explains. “The driver chip incorporates transmit equalisation, which widens the bandwidth of the optical link. While this method has been widely used in electrical communication, it hasn’t yet caught on in optical communication,” he says.
“Researchers typically rely on a rule of thumb that says the usable data-transfer rate is about 1.7 times the bandwidth,” Kuchta explains. “That means that with the VCSEL laser, which has a bandwidth of about 26 GHz, the rate would be only about 44 Gb/s.What we’re doing
March 2014
www.compoundsemiconductor.net 101
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