Coherent light generators – Particular resonant cavity – Folded cavity
Patent
1998-02-20
2000-06-20
Kim, Robert H.
Coherent light generators
Particular resonant cavity
Folded cavity
372 94, 372 32, 372 92, 372 28, 372 6, 372108, 372100, 385 15, 385 50, 359326, 359222, 359211, 455610, 437129, 437130, 437133, 350356, H01S 3083, H01S 303, G02F 626, G02F 135, G02B 624
Patent
active
060786051
ABSTRACT:
A device and method of track changing an optical signal beam in response to the frequency selective phase characteristics of a resonator. The resonator is side-coupled to a single optical beam and only affects that beam's phase, without disturbing its amplitude to any significant degree. For all resonator and input beam configurations, the phase-shift at a resonant frequency is always .pi., thus the relative switching characteristics are similar regardless of the exact configuration. Track changing is accomplished through interferometry. The signal, after having interacted with the resonator, is made to interfere with a reference beam. The reference beam is created by dividing an input signal into two paths, one which interacts with the resonator, the other which serves as the reference. In an alternative embodiment, the device acts as a mode converter. The resonator converts an even system-mode to an odd system-mode (or vise versa). At the output of the device is an interference filter, or mode filter, which redirects the signal according to the phase response of the resonator.
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Chu Sai Tak
Haus Hermann A.
Little Brent E.
Flores Ruiz Delma R.
Kim Robert H.
Massachusetts Institute of Technology
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