907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User’s Guide
Focal Technologies Corp. Page 6-6
6.5 907-CWDM-4 (4-Channel CWDM Optics Card)
907-0015-31 (SMF), 907-0015-34 (MMF)
Several versions of 4-Channel CWDM optics cards (907-CWDM-4) are available for the Model 907. Variations
include multimode and singlemode options, different ranges of wavelengths, different physical layouts and
connector types, and options for bypass/express ports to daisy chain CWDMs.
A typical 907-CWDM-4 optics card, shown in Figure 6-6, is used to optically multiplex four standard CWDM
channels with 20 nm spacing from P1, P2, P3, and P4, into a single common optical fiber (COM) for
connection to the external fiber system, typically at an ST/PC bushing. The same card is used to de-multiplex
signals from a single fiber into four optical channels.
A 907-CWDM-4 card with P/N 907-0015-31 for example, multiplexes singlemode CWDM channels 1471,
1491, 1511 and 1531. In addition, an express channel (EXP), when available, can be used to bypass all
wavelengths from 1551 to 1611 nm.
Pressure tolerant versions of the 907-CWDM-4 cards are also available.
Figure 6-6: 907-CWDM-4, 4-Channel CWDM Optics Card
Optical insertion loss is typically less than 2.5 dB per 907-CWDM-4 card. Optical link analysis must account
for CWDM cards at both ends of the system.
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