counter for iweb
Silicon Photonics

Published book, click here


Mobile broadband: congestion is inevitable

Shown is a table listing the typical bandwidth requirements for various applications.

The table is taken from a recent report by Peter Rysavy of Rysavy Research, entitled Mobile Broadband Capacity Constraints And the Need for Optimization.

The report looks at the huge growth in mobile broadband services and the resulting congestion. The report includes a nice model showing how only a few intensive users can consume much of a cell's capacity. The report also discusses how operators must continue to add wireless capacity while being a lot smarter in the bandwidth consumed by applications.

To see a copy of the report, click here

Click to read more ...


OFC/NFOEC 2010: Announcements round-up

A brief review of some of the eye-catching announcements emerging from this year’s OFC/NFOEC being held in San Diego this week.

The Infinera Express: Infinera's 80-foot-long truck-based mobile demo unit, is at OFC/NFOEC. Infinera is part of a demo of live 100 GigE data traffic with Juniper Networks, Finisar, Opnext and Reflex Photonics. The truck also contains Infinera’s ATN metro edge platform.

Demonstrations and displays

The Optical Internetworking Forum (OIF) is displaying components and hardware as part of its integrated transmitter and receiver initiative for 100Gbps transponders.

Click to read more ...


Opnext's multiplexer IC plays its part in 100Gbps trial 

AT&T’s 100 Gigabit-per-second (Gbps) coherent trial between Louisiana and Florida detailed earlier this week was notable for several reasons. It included a mix of 10, 40 and 100Gbps wavelengths, Cisco Systems' newest IP core router, the CRS-3, and a 100Gbps line-side design from Opnext.


According to Andrew Schmitt, directing analyst of optical at Infonetics Research, what is significant about the 100Gbps AT&T trial is the real-time transmission; unlike previous 100Gbps trials no received data was block-captured and decoded offline.

Click to read more ...


Verizon plans coherent-optimised routes

Glenn Wellbrock, director of backbone network design at Verizon Business, was interviewed by gazettabyte as part of an upcoming feature on high-speed optical transmission.  Here are some highlights of what he shared. The topics will be expanded upon in the upcoming feature.


 "Next-gen lines will be coherent only"

 Glenn Wellbrock, Verizon Business

Click to read more ...


OFC/NFOEC 2010: Technical paper highlights 

At this year’s OFC/NFOEC, to be held on March 21-25, all the main themes driving optical networking are represented:  40 and 100Gbps transmission, coherent detection, photonic integration, and the latest in optical access such as WDM-PON.

Here is a sample of some of the noteworthy papers.


Click to read more ...


Framing the information age

Maurice Broomfield is a 94-year-old photographer who has documented examples of 20th century industry. His lifelong work is about to be shown at two exhibitions in the UK, as detailed in an interview with the Financial Times. It made me wonder whether anyone is doing the equivalent for telecom and datacom? Mega data centres as IT cathedrals?

When writing features for FibreSystems Europe, I repeatedly asked for high-resolution striking images. The magazine's editors always wanted photos that included people, like Maurice Broomfield's photos.  Getting hold of such images did happen but not often.

Inspired by the Financial Times’ interview and Maurice Broomfield's beautiful images, some of the better images sent are presented here.


IBM data centre

Click to read more ...


UNIC silicon modulator

Kotura has detailed a compact, low-power silicon-based optical modulator; an important building block to enable dense on-chip optical interconnects. The modulator operates at up to 11Gbit/s, consumes 0.5mW and has an area of 1000µm2.

This is the silicon photonic start-up’s first announced modulator. The design has been developed in conjunction with Sun Microsystems as part of the DAPRA Ultraperformance Nanophotonic Intrachip Communications (UNIC) programme.


An image of the modulator and a cross-section diagram of the ring waveguide. Source: Kotura

Click to read more ...