Olson Technology OT-DCM-F User Manual
Page 5
025-000566 Rev. X3
www.olsontech.com
4
In Figure 2, an OT-DCM-F100 (optimized for 100km or Corning SMF-28
®
) was inserted in-line at the 100km distance.
This resets the dispersion to nearly zero and allows an additional 100km distance can be achieved with essentially the
same results as were achieved at 100km. One downside of a DCM is its relatively high insertion loss. Figure 3 illustrates
how this is usually circumvented.
Figure 3 - Typical DCM Application
GENERAL FEATURES
The Olson Technology OT-DCM-F Series Dispersion Compensation Module operates near 1550nm where NDSF
dispersion has a typical value of 17ps/nm/km. The DCM is a totally passive device consisting of a spool of special fiber
(Dispersion Compensating Fiber (DCF)) that has high negative dispersion. Unlike Fiber Bragg Gratings (FBG’s), DCM’s
based on DCF work over a continuous range of wavelengths. The front panel of the DCM, shown in Figure 4, only has
vendor and part number markings. The rear panel of the DCM, shown in Figure 5, has the optical input and output
connectors. These are always angle polished connector (APC) types.
Figure 4 - OT-DCM-F Front Panel
Figure 5 - OT-DCM-F Rear Panel