APA Optics announces new flat-top passband for DWDMs

Sept. 13, 2001--APA Optics, Inc. has announced availability of its Dense Wavelength Division Multiplexers with Flat-top passband in addition to the Gaussian passband previously provided.

APA Optics, Inc. has announced availability of its Dense Wavelength Division Multiplexers (DWDM) with Flat-top passband in addition to the Gaussian passband previously provided.

Available in 50, 100 and 200 GHz singlemode models, APA Optics Flat-top passband provides network designers additional flexibility to select the passband that best matches the application, the network architecture and specifications of other components in the network.

For example, the APA Optics Flat-top passband provides additional passband to compensate for temperature and time related drift of center of the wavelength's network components. In addition, the Flat-top passband minimizes passband narrowing that occurs with cascading of components having a Gaussian passband.

The benefits of a Gaussian passband is low insertion loss and high isolation. "These benefits, and the ability to provide a Flat-top passband in a diffraction grating based mux/demux, are creating new applications for bulk diffraction grating based mux/demux components," according to Terry VanderWert, APA Optics business manager for fiber optic products.

Additional features of both Flat-top and Gaussian models include: passive athermal design that requires no active temperature control; ideal for field upgrades since the input and output fibers enter and exit from the same location.

Comparative specifications for the two 100 GHz spacing components are:

* Gaussian: -0.5 dB passband is >0.095 nm (12 GHz); -1.0 dB passband is 0.14 nm (17.5 GHz)

* Flat-top: -0.5 dB passband is 0.2 nm (25 GHz); -1.0 dB passband is 0.28 nm (37 GHz)

Passband widths for other wavelength spacings are proportional to spacing.

About APA Optics:

For more information, visit www.apaoptics.com.

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