Optical waveguides – Polarization without modulation
Patent
1993-03-17
1994-02-08
Lee, John D.
Optical waveguides
Polarization without modulation
385 28, 385 45, 385 31, G02B 610
Patent
active
052855074
ABSTRACT:
Controllable polarization transformer comprising a passive mode converter (4), a controllable phase shifter (5) and a controllable Mach-Zehnder interferometer (7). The mode converter (4) converts the first signal component of one polarization (TE or TM) of a light signal entering via an input (1) into a signal component of the other polarization without affecting the second signal component of the other polarization (TM or TE), the conversion taking place to another order of the guided mode. Phase control by means of the phase shifter (5) controls the intensity distribution of the light signal over the two branches (8, 9) of the interferometer (7). Optical wavelength control in the interferometer (7) controls the phase with which the signals through the branches come together in the output (2). Advantages: very good integration capability, preferably on semiconductor material, with a waveguide structure which can be achieved in a single etching step and without critical manufacturing parameters; can be used reciprocally, even as a polarization modulator.
REFERENCES:
patent: 5115517 (1992-05-01), Riviere
patent: 5185828 (1993-02-01), van der Tol
M. Schlak, et al, "Tunable TE/TM-Mode Converter on (001)-In-P-Substrate", Jan. 1991, pp. 15-16, IEEE Photonics Technology Letters, No. 1, New York, US.
Y. Shani, et al, "Polarization Rotation in Asymmetric Periodic Loaded Rib Waveguides", Sep. 1991, pp. 1278-1280, 1991 American Institute of Physics.
Heartney Phan Thi
Koninklijke PTT Nederland N.V.
Lee John D.
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