Abstract

Based on the flexibilities of light beam propagation in three dimensions, we propose an improved N-port optical quasi-circulator by using a pair of orthogonal holographic spatial- and polarization- modules. All optical elements are located in parallel planes that are perpendicular to the optical axis. The number of optical elements is decreased, and a higher performance optical quasi-circulator without crosstalk and polarization mode dispersion can be easily achieved. A prototype of 5-port polarization-independent optical quasi-circulator operating at a wavelength of 1300nm was assembled and tested to show its validities.

© 2004 Optical Society of America

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References

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    [CrossRef]

Electron. Lett.

M. Koga, �??Compact quartzless optical quasi-circulator,�?? Electron. Lett. 30, 1438-1440 (1994).
[CrossRef]

IEEE Photon. Technol. Lett.

Y. K. Chen et al. �??Low-crosstalk and compact optical add-drop multiplexer using a multiport circulator and fiber Bragg gratings,�?? IEEE Photon. Technol. Lett. 12, 1394-1396 (2000).
[CrossRef]

A. V. Tran et al. �??A bidirectional optical add-drop multiplexer with gain using multiport circulators, fiber Bragg gratings, and a single unidirectional optical amplifier,�?? IEEE Photon. Technol. Lett. 15, 975-977 (2003).
[CrossRef]

Y. Sato and K. Aoyama, �??OTDR in optical transmission systems using Er-doped fiber amplifiers containing optical circulators,�?? IEEE Photon. Technol. Lett. 3, 1001-1003 (1991).
[CrossRef]

N. Sugimoto et al. �??Waveguide polarization-independent optical circulator,�?? IEEE Photon. Technol. Lett. 11, 355-357 (1999).
[CrossRef]

Opt. Express

Opt. Lett.

Proc. SPIE

B. J. Chang, Optical information storage, Proc. SPIE, vol. 177, 71-81 (1979).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Three dimensional structure and operational characteristics of the holographic spatial-and polarization- module.

Fig. 2.
Fig. 2.

Structure and operational characteristics of a module by connecting a pair of HSPMx and HSPMy.

Fig. 3.
Fig. 3.

Operational characteristics of the module when an unpolarized light is shuttled between the two sides.

Fig. 4.
Fig. 4.

Structure and operation principles of the proposed 5-port polarization-independent optical quasi-circulator.

Tables (1)

Tables Icon

Table 1 Associated losses and isolation values (in Decibels) of a 5-port quasi-circulator with a wavelength of 1300nm by using (a) our fabricated HSWPs; (b) ideal HSWPs with anti-reflection coatings and diffraction efficiencies of ηu<1% and ηv>99%.

Equations (4)

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[ x u ( 2 n 1 ) y u ( 2 n 1 ) x v ( 2 n 1 ) y v ( 2 n 1 ) ] z = L = [ ( 1 n ) L ( 1 n ) L ( n 1 ) L ( n 1 ) L ] z = L , ( for an odd port )
[ x u ( 2 n ) y u ( 2 n ) x v ( 2 n ) y v ( 2 n ) ] z = L = [ ( 2 n ) L n L n L ( n 2 ) L ] z = L . ( for an even port )
[ x R P 1 ( 2 n 1 ) y R P 1 ( 2 n 1 ) x R P 2 ( 2 n 1 ) y R P 2 ( 2 n 1 ) x PBS ( 2 n 1 ) y PBS ( 2 n 1 ) ] z = L = [ ( 1 n ) L ( 1 n ) L ( n 1 ) L ( n 1 ) L ( n 1 ) L ( 1 n ) L ] z = L , ( for an odd port )
[ x R P 1 ( 2 n ) y R P 1 ( 2 n ) x R P 2 ( 2 n ) y R P 2 ( 2 n ) x PBS ( 2 n ) y PBS ( 2 n ) ] z = L = [ ( 2 n ) L n L n L ( n 2 ) L n L n L ] z = L . ( for an even port )

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