Accession Number : ADP008204

Title :   A Birefringent Fiber 4X4 Wavelength Crossconnect,

Corporate Author : GTE LABS INC WALTHAM MA

Personal Author(s) : Cousins, Sarah ; Carlsen, W. J.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : A general technique for making all-fiber polarization-independent birefringent wavelength division multiplexers (BWDM) was introduced at this conference last year, and a first order 1x2 multiplexer with 0.2 nm channel spacing was presented.' This technique has now been extended, using birefringent filter synthesis, to the design of a polarization-independent 4x4 wavelength crossconnect. This device has 0.78 nm channel spacing and is constructed from single-mode birefringent fibers and polarizing beam-splitters. A 4x4 wavelength crossconnect can be used to distribute 16 signals at 4 different wavelengths as shown schematically. We have introduced a new design that is inherently simpler than conventional designs, and consists of a narrow channel BWDM in series with a wide channel flattened passband BWDM. The BWDMs are made from birefringent fibers (here 1.5 m and 3.0 m lengths) at appropriate angles (here 450 and -150) between polarizing beamsplitters (PBSs). We planned to make an all-fiber crossconnect but our all-fiber polarizing beam-splitters had insufficient extinction (30 dB is desirable) so we replaced them with bulk PBSs.

Descriptors :   *PHOTONICS, *BIREFRINGENCE, ANGLES, CHANNELS, DIVISION, EXTINCTION, FIBERS, FILTERS, POLARIZATION, SIGNALS, SYNTHESIS, MULTIPLEXING, BEAM SPLITTING.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE