Laser Sources for Optical Transceivers
Optical transceivers use different semiconductor laser sources depending mainly on the reach and bit rate that the device has to guarantee. In this paper we will describe the most commonly used types and their application. We will skip the physics of the laser and semiconductors; we will focus only on the technological aspects of each […]
Discovering the truth behind Transceiver Warranties
Sometimes ProLabs hears that a network equipment manufacturer’s sales representative has threatened a customer (which could be an end user, reseller or system integrator, etc.) that if they install third-party transceivers in the system, this will void the system manufacturer’s warranty. In this way, the sales representative tries to coerce customers into purchasing transceiver modules from the same system manufacturer, usually at much higher prices than ProLabs charges. Someone may use this type of warranty threat to spread fear, uncertainty and doubt in the minds of consumers, rather than to compete on the basis of quality and price.
How to bridge the Open Compute gap when you’re not Facebook?
Engineers in the data-center business are probably following the Open Compute Project (OCP) closely. The Facebook-led project began in 2011 to build a data center from the ground up, scaling infrastructure more efficiently and economically. In short, it provides engineers technical advantages and freedom from Tier-I original equipment manufacturers (OEMs)—similar to the open source movement in the 90s with Linux
The rise of Silicon Photonics
Electronics and photonics have been two worlds apart for many years: Electronics had an explosion that forever changed the way consumers live and businesses run; photonics became the de facto medium for the transport of information in the telecom and datacom industry. Although optical communication enabled the rise of the Internet and the steep price decline everyone enjoyed, it didn’t reach the level of diffusion and the pace of integration and performance experienced by the semiconductor business.
Understanding DWDM & Optical Communication
DWDM – Without optical communication we would be still sending mail, going to the news-stand to buy a newspaper, sending mail and postcards and renting movies, no internet would have been possible, no digital communications as we know it.
Modulation of Light
A key functionality of an optical system is the modulation operation, which consists in “converting” the electrical data signal into the optical domain. We will briefly introduce two difference strategies used for the optical intensity modulation operation, looking at the benefits and limitations.
FEC in Optical Transmission
When we introduced the DWDM optics, we left out one important ingredient that really makes the difference: Forward Error Correction (FEC). FEC is what permits networking equipment to receive a degraded signal, and still deliver error free traffic to the end user, correcting transmission errors. The basic behaviour is fairly simple, the implementation and mathematics behind it can be definitely complicated…