counter for iweb
Website
Facebook
Silicon Photonics

Published book, click here

Entries in DSP (5)

Friday
Sep152017

Has coherent optical transmission run its course?

Feature: Coherent's future

Three optical systems vendors share their thoughts about coherent technology and the scope for further improvement as they look two generations ahead to symbol rates approaching 100 gigabaud   

Optical transmission using coherent detection has made huge strides in the last decade. The latest coherent technology with transmitter-based digital signal processing delivers 25x the capacity-reach of 10-gigabit wavelengths using direct-detection, according to Infinera.

Since early 2016, the optical systems vendors Infinera, Ciena and Nokia have all announced new coherent digital signal processor (DSP) designs. Each new generation of coherent DSP improves the capacity that can be transmitted over an optical link. But given the effectiveness of the latest coherent systems, has most of the benefits already been achieved?

 

Source: Infinera

“It is getting harder and harder,” admits Kim Roberts, vice president, WaveLogic science at Ciena. “Unlike 10 years ago, there are no factors of 10 available for improvement.”

Click to read more ...

Monday
Mar232015

MultiPhy readies 100 Gigabit serial direct-detection chip

MultiPhy is developing a chip that will support serial 100 Gigabit-per-second (Gbps) transmission using 25 Gig optical components. The device will enable short reach links within the data centre and up to 80km point-to-point links for data centre interconnect. The fabless chip company expects to have first samples of the chip, dubbed FlexPhy, by year-end.

Figure 1: A block diagram of the 100 Gig serial FlexPhy. The transmitter output is an electrical signal that is fed to the optics. Equally, the input to the receive path is an electrical signal generated by the receiver optics. Source: Gazettabyte

Click to read more ...

Tuesday
Aug142012

Cortina unveils multi-channel dispersion compensation chip 

Cortina Systems has announced its latest electronic dispersion compensation (EDC) chip.  The CS4342 is a compact device that supports eight duplex 10 Gigabit-per-second (Gbps) links. 

 

"Some customers are doing 2,000 signals at 10 Gig across the backplane"

Scott Feller, Cortina 

 

 

 

 

 

Click to read more ...

Thursday
Mar082012

The post-100 Gigabit era

Feature: Beyond 100G - Part 4

The latest coherent ASICs from Ciena and Alcatel-Lucent coupled with announcements from Cisco and Huawei highlight where the industry is heading with regard high-speed optical transport. But the announcements also raise questions too. 

 

Source: Gazettabyte

Click to read more ...

Tuesday
Dec062011

2012: The year of 100 Gigabit transponders

Oclaro has detailed its 100 Gigabit coherent optical module that will be available from the second quarter of 2012. The MI 8000XM, a 5x7-inch 100 Gigabit-per-second (Gbps) transponder, uses NTT Electronics' (NEL) analogue-to-digital converter/ digital signal processor (DSP) ASIC at the receiver that compensates for transmission impairments.

 

“The world is moving to coherent, there is no question about that”

Per Hansen, Oclaro

 

 

Click to read more ...