No, it's using low-TC SQUID ICs. Until my quantum mechanics is back up to speed, I'm just going to be kibitzing and help solve implementation problems. It'll be nice to have colleagues again.
Anyons for tennis? ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
It is certainly a bit circular, but nobody has found a way to get around the necessity that the Universe support intelligent life for that life to invent Physics.
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058
hobbs at electrooptical dot net
http://electrooptical.net
Let me rephrase that: No human scientist has found a way to get around the necessity that the Universe support intelligent life for that life to invent Physics.
But even so, it wouldn't be consistent for God to invent beings that could not live in their Universe of residence. So we are back to the basic Anthropic Principle.
The fine structure constant really is a variable probably! So the anthropic principle isn't necessary there. If its value changes only a small amount even at 80GeV then you would have to go way back in the universe to see an overall difference in its value I guess? They are starting to check the CMB radiation to try to see if its value is different there, but also they could do more accelerator experiments to see what type of curve the fine structure "constant" follows at different interaction energies maybe.
Since the fine structure constant is basically the ratio of the impedance of free space and the quantum hall resistance, it contains just c, e, u_o and h. Which of those would be variable? Oh, yes, there's a factor of two in there too. That must be it. ;-)
Jul 2, 2013, Twisted light carries data over 1 km in optical fibre:
formatting link
Quote: "? A new type of optical fibre that can carry "twisted" light over long distances has been developed by researchers in the US, Israel and Denmark. ? According to Ramachandran, who led the development of the fibre, the new system is designed so that the phase velocities of the OAM modes are different. This minimizes the probability of coupling between modes as the signals propagate along the fibre. ? This fibre is designed to carry four distinct modes ? two zero-OAM modes that propagate in the inner circular core and two OAM modes that propagate in the outer ring. [PS: in the same kernel] ? Development of the system that encodes and decodes the OAM pulses was led by Willner at USC. Dubbed OAM mode-division multiplexing (OAM-MDM), the system encoded data into four separate channels. These are defined in terms of the OAM (0 or 1) and circular polarization (?1 or 1) of the light. Using just these four modes, the team was able to transmit data over a 1.1 km fibre at a rate of 400 Gbit/s. ? The system was also able to reproduce each quartet of OAM modes at 10 different wavelengths of light ? a technique called wavelength-division multiplexing (WDM). This boosted the transmission rate to 1.6 Tbit/s ? the equivalent of transmitting eight Blu-ray discs every second. While such data rates are routinely achieved by commercial WDM systems, this is the first time that OAM-based transmission has been achieved over distances greater than a metre. ?"
( New Optical Fiber Puts a Twist on Data Transmission:
formatting link
)
-
Science 28 June 2013: Terabit-Scale Orbital Angular Momentum Mode Division Multiplexing in Fibers:
formatting link
Citat: "? Internet data traffic capacity is rapidly reaching limits imposed by optical fiber nonlinear effects. Having almost exhausted available degrees of freedom to orthogonally multiplex data, the possibility is now being explored of using spatial modes of fibers to enhance data capacity. We demonstrate the viability of using the orbital angular momentum (OAM) of light to create orthogonal, spatially distinct streams of data-transmitting channels that are multiplexed in a single fiber. Over 1.1 kilometers of a specially designed optical fiber that minimizes mode coupling, we achieved 400-gigabits-per-second data transmission using four angular momentum modes at a single wavelength, and 1.6 terabits per second using two OAM modes over 10 wavelengths. These demonstrations suggest that OAM could provide an additional degree of freedom for data multiplexing in future fiber networks. ?"
-
September 16-20, 2012, Orbital Angular Momentum (OAM) Based Mode Division Multiplexing (MDM) over a Km-length Fiber:
formatting link
Citat: "? Abstract We demonstrate the first MDM scheme using OAM states over
1.1-km of fiber. This is enabled by a SLM-based Mux/Demux setup, and a fiber designed to propagate multiple OAM modes over km lengths. We confirm low crosstalk (
By changing the boundary conditions for the wave equation, you can change the number of available modes, and change the shape of the modes themselves in an almost arbitrary manner. Like evanescent waves, that's not new news.
The claims that were being made at the beginning of this foofaraw were that there were all these previously-undiscovered modes that could get us N times more bandwidth for free.
The thermodynamic argument shows that that's not true, because if it were, black bodies would glow N times more brightly than they do.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058
hobbs at electrooptical dot net
http://electrooptical.net
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.