Cisco Compact Reverse Transmitters 9008x with FP, DFB or CWDM Lasers Data Sheet

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Data Sheet

Compact Reverse Transmitters with DFB or CWDM
Lasers

Cisco

Compact Nodes can be configured with a variety of optical reverse transmitters

to provide flexibility for use in multiple applications. These reverse transmitters are
plug-in modules that deliver a cost-effective, user-friendly solution for upstream
transmission. The Compact Reverse Transmitters (Figure 1) are available with
distributed feedback (DFB) or Coarse Wavelength Division Multiplexing (CWDM)
lasers.

All transmitters feature a built-in microprocessor and pilot tone for easy set-up of the reverse path. The pilot tone

does not take up any reverse bandwidth as it is placed at 5 MHz. Moreover, placing the pilot tone at 5 MHz also

makes the reverse transmitter interoperable with virtually all reverse receivers in the marketplace. If there is no

modulation, the pilot tone serves as a quieting tone, which reduces spurious noise and improves overall noise

performance with up to 15 dB. All reverse transmitters have increased gain, which allows low reverse input levels

at the node.

The reverse transmitter can also run in burst mode which makes it possible to deploy Cisco Compact Nodes in a

radio frequency over glass (RFOG) network.

Reverse Transmitters and CWDM

The reverse transmitters (Figure 2) are an integral part of the CWDM transport system making it possible for each

fiber in a hybrid fiber-coaxial (HFC) network to support a sixteen-fold increase in the number of wavelengths

available. The CWDM lasers offer two output powers, 3 dBm and 6 dBm.

Figure 1. Reverse Transmitter