Hi Sam. I live in Seattle so Boston sounds pretty far away.
You said:
"Would love to engage in some dialog relative to optical filters versus Bragg grating filters".
Unfortunately I don't understand the technology enough to discuss it with you, but I did post a link on the LPTHA thread where you can download 2 files (part I, II) from Nortel discussing the future of Optical Networks.
Here it is:
techstocks.com
Here is an excerpt.
One way to provide a very precise wavelength reference is to use fiber grating filter technology, which forms a grating in a short length of fiber by illuminating it with two oblique ultraviolet beams. This fiber grating is inserted into a feedback loop to provide a control signal to keep the light emitted by the laser within an acceptable wave-length range. Nortel is also assessing a prototype system based on Etalon filter technology. Etalon filters stop light of the wrong wavelength, while passing light of the desired wave-length. By changing the angle of light striking the Etalon's surface, its filter characteristics can be tuned to the correct optical frequency with a high degree of accuracy. Using fiber grating technology, Nortel has developed a prototype four-channel WDM multiplexer/demultiplexer. Fiber grating technology is especially effective in this application because it pro-duces so-called "top-hat" filters that have a flat top and steep sides. In these filters, the transmission of traffic drops off very quickly outside the desired wavelength frequency. This sharp cutoff enables extremely accurate selection of individual wave-lengths, and high rejection of stray light pulses from other wavelengths, while remaining tolerant to small changes in the source wavelength. For future applications, Nortel is also exploring another advanced technology, called planar waveguides, which are optical circuits incorporated into the layers of silica or silicon-based lasers. Planar waveguides are compact, potentially cost-effective, and can handle more complex functions than components made of fiber or bulk objects. As the number of channels carried on a fiber increases, a primary applica-tion of planar waveguides will be for dense WDM multiplexers/ demultiplexers.
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Notice the part that I highlighted in bold. Then check out this link. Notice that COHR makes etalon filters. Coherent is also a competitor of Cymer (CYMI) which is positively exploding. I believe Coherent's subsidiary Lambda Physik (German) competes with Cymer and has sued CYMI for patent infringement. At a trailing PE of 19 COHR looks to be an exciting possibility considering it's 26 straight quarters of record growth.
supersite.net
If you get a chance tell me what you think. |
