Depolarizer using unpumped, doped optical fiber and method using

Details Depolarizer using unpumped, doped optical fiber and method using Depolarizer using unpumped, doped optical fiber and method using

1992-12-31

1994-08-09

Healy, Brian

Optical waveguides

Polarization without modulation

385 27, 385 29, 385 31, 385 38, 385123, 385141, 385142, 372 6, 359333, 359341, 359342, 359483, G02B 610, H01S 330

Patent

active

053373758

ABSTRACT:
Previous efforts to measure polarization dependent loss of optical components have been limited in uncertainty to more than 0.01 dB. This is because the power meter used in a test set contains polarization dependent loss which adversely affects the final readings. It is here disclosed that an unpumped erbium doped fiber can convert a received polarized signal into unpolarized amplified spontaneous emission of a longer wavelength if the fiber is of sufficient length to absorb the received signal. By locating the inventive unpumped erbium doped fiber upstream of the power meter of a test set, the polarized signal to the power meter is coverted to an unpolarized signal and, therefore, the polarization dependent loss of the power meter can not influence the measurement obtained.

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"Proposal for a Fiber-Optic Endlessly Rotatable Fractional Wave Device and its Applications to Lightwave Technologies" T. Matsumoto, et al., Electronics and Communications in Japan, Part 2, vol. 71, No. 6, 1988.

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