The 'comb'

Bishadi · Oct 23, 2011

Does this remind anyone of a basic 'photo electric effect' but in 'waves'?

"These pulses repeat at very high rates, corresponding to hundreds of billions of pulses per second," said Andrew Weiner, the Scifres Family Distinguished Professor of Electrical and Computer Engineering.

The tiny "microring resonator" is about 80 micrometers, or the width of a human hair, and is fabricated from silicon nitride, which is compatible with silicon material widely used for electronics. Infrared light from a laser enters the chip through a single optical fiber and is directed by a structure called a waveguide into the microring.

The pulses have many segments corresponding to different frequencies, which are called "comb lines" because they resemble teeth on a comb when represented on a graph.

By precisely controlling the frequency combs, researchers hope to create advanced optical sensors that detect and measure hazardous materials or pollutants, ultrasensitive spectroscopy for laboratory research, and optics-based communications systems that transmit greater volumes of information with better quality while increasing bandwidth. The comb technology also has potential for a generation of high-bandwidth electrical signals with possible applications in wireless communications and radar.

The light originates from a continuous-wave laser, also called a single-frequency laser.

"This is a very common type of laser," Weiner said. "The intensity of this type of laser is constant, not pulsed. But in the microring the light is converted into a comb consisting of many frequencies with very nice equal spacing. The microring comb generator may serve as a competing technology to a special type of laser called a mode-locked laser, which generates many frequencies and short pulses. One advantage of the microrings is that they can be very small."

The laser light undergoes "nonlinear interaction" while inside the microring, generating acomb of new frequencies that is emitted out of the device through another optical fiber.

"The nonlinearity is critical to the generation of the comb," said doctoral student Fahmida Ferdous. "With the nonlinearity we obtain a comb of many frequencies, including the original one, and the rest are new ones generated in the microring."

Findings are detailed in a research paper appearing online this month in the journal Nature Photonics. The paper is scheduled for publication in the Dec. 11 issue.
Click to expand...

or how about the coherance?

The researchers were able to control the amplitude and phase of each spectral line, learning that there are two types of combs -- "highly coherent" and "partially coherent" -- opening up new avenues to study the physics of the process.

"In future investigations, the ability to extract the phase of individual comb lines may furnish clues into the physics of the comb-generation process," Ferdous said. "Future work will include efforts to create devices that have the proper frequency for commercial applications."
Click to expand...

so an incoming light and then a wavefront of waves emitted.

http://www.sciencedaily.com/releases/2011/10/111020025251.htm

aint science cool?

Bishadi · Jan 22, 2012

Bishadi said: ↑

aint science cool?
Click to expand...

Bishadi · Apr 20, 2012

Bishadi said: ↑

Click to expand...

http://digital-library.theiet.org/ebooks/iet/electromagnetic_waves/ew036e/ew036e_ch5?isAuthorized=no

syense

Log in or Sign up

The 'comb'

Bishadi Banned

Bishadi Banned

Bishadi Banned

Share This Page

Log in or Sign up

The 'comb'

Bishadi Banned

Bishadi Banned

Bishadi Banned

Share This Page

Useful Searches