Electrically controlled optical switch for multimode fiber applications.

An electrically controlled optical switch based on polarization principles is described. It uses a liquid crystal twist cell that rotates polarization by 90 degrees , and it operates on an ac voltage that switches between 0.8 and 2.5 V rms. The switch has a loss of ~0.4 dB, neglecting reflections, in an unpolarized incoherent beam and a cross-talk ratio of ~-20 dB. It operates in collimated light, but it can be applied to multimode fibers using collimating lenses, which are expected to add <0.8 dB to the loss.

[1]  P. G. Hale,et al.  Mechanical optical-fibre switch , 1976 .

[2]  Iwamura Hidetoshi,et al.  Simple polarisation-independent optical circulator for optical transmission systems , 1979 .

[3]  M. Nunoshita,et al.  Optical switch for multimode optical-fiber systems. , 1979, Optics letters.

[4]  R. Soref.  Liquid-crystal fiber-optic switch. , 1979, Optics letters.

[5]  T Matsumoto,et al.  Polarization-independent optical circulator: an experiment. , 1980, Applied optics.

[6]  Hiroshi Iwasaki,et al.  A compact optical isolator using a Y3Fe5O12 crystal for near infra-red radiation , 1978 .

[7]  W B Spillman,et al.  Fail-safe fiber-optics data bus using active multimode mirror terminals. , 1978, Applied optics.

[8]  Richard E. Wagner,et al.  Multiposition optical-fibre switch , 1979 .

[9]  R. Soref,et al.  Multimode optical multiplexing with low-voltage drivers. , 1978, Optics letters.

[10]  Moving optical-fiber switch experiment. , 1978, Applied optics.

[11]  W. Tomlinson,et al.  Applications of GRIN-rod lenses in optical fiber communication systems. , 1980, Applied optics.

[12]  Hl. de Vries.  Rotatory power and other optical properties of certain liquid crystals , 1951 .

[13]  D H McMahon,et al.  Total switching of unpolarized fiber light with a four-port electro-optic liquid-crystal device. , 1980, Optics letters.

[14]  Tsutomu Aoyama,et al.  Low-loss 4 × 4 optical matrix switch for fibre-optic communication , 1979 .

[15]  M. Schadt,et al.  Physical properties of new liquid-crystal mixtures and electrooptical performance in twisted nematic displays , 1978, IEEE Transactions on Electron Devices.

[16]  A. Shibukawa,et al.  Compact optical circulator for optical fiber transmission. , 1979, Applied optics.

[17]  F. J. Sansalone,et al.  Compact optical isolator. , 1971, Applied optics.