General Information And Specifications; General Information; Optics - JDS Uniphase TB9 Series User Manual

General Information and Specifications

General Information

This user's manual for the TB9 Series Optical Grating Filter contains complete operating
instructions.
The TB9 grating filter is designed for high performance laboratory and production testing of
single-mode fiber-based components and subsystems (Figure 1). Single- and double-pass
grating configurations are available to provide high rejection and narrow bandwidth. Optical
performance for the C-band is optimized in the 1530 to 1570 nm window, but the filter can be
controlled over the wavelength range of 1460 to 1575 nm. Optical performance for the L-band
is optimized in the wavelength range of 1525 to 1625 and has a tuning range of 1460 to 1575.
Six standard models are available with different bandwidths and optical performance.
Figure 1: TB9 Optical Grating Filter
The TB9 grating filter contains a lens that collimates light from the input fiber. A diffraction
grating reflects collimated light back through the lens. This filtered light is then focused into the
output fiber.
The angle of the diffraction grating is controlled by a stepper motor that is driven by the
microprocessor of the TB9 grating filter. On power-up, the microprocessor positions the angle
of the grating to 1460 nm or to 1525 nm for extended-range models. Each time a wavelength
command is entered, the microprocessor determines how many steps this wavelength is from
the reference position and moves the diffraction grating to the required angle.

Optics

The optics of the TB9 grating filter are bi-directional, and therefore either fiber port can be
used as the input. If an optional coupler or switch is installed, the user must ensure that the
connections to these are appropriate.
Getting Started – 6
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