DWDM optics

Overview

Alcatel-Lucent 1665 DMX supports low-cost DWDM optics. These optics include 16 different OLIUs (2 wavelengths per OLIU) for OC-48 transmission, the OMD5/8 8-channel mux/demux (LNW785), and a choice of 5 different Passive Optics Units (POUs) where the various wavelengths are combined for transmission over one fiber. The DWDM wavelengths or channels are chosen at 100 GHz increments per the ITU grid.

DWDM PTM-based circuit packs

Alcatel-Lucent 1665 DMX PTM-based OC-48 main and tributary packs support OC-48 DWDM PTMs. In conjunction with the POUs , these packs increase fiber capacity. The PTM-based OC-48 main and tributary packs also support OC-48 CWDM PTMs. The PTM-based OC-192 main and tributary packs support OC-192 DWDM PTMs. In conjunction with a mux/demux system, these packs canincrease the fiber capacity.

OC-48 DWDM/CWDM PTMs

The following circuit packs support OC-48 DWDM/CWDM PTMs

LNW55
LNW62
LNW82
LNW202
LNW402
LNW504

For a list of the DWDM OC-48 PTMs, see Table 10-61, OC-48 DWDM PTM wavelengths.

OC-192 DWDM PTMs

The following circuit packs support OC-192 DWDM PTMs

LNW59
LNW502
LNW504
LNW705

For a list of the DWDM OC-192 PTMs, see Table 10-72, OC-192 DWDM PTM wavelengths.

Passive optics units

As the variety of applications listed above suggests, there are various versions of the POU, each designed to maximize functionality in a variety of deployment scenarios. The list below details the various forms of POUs:

16 Channel MUX or DMUX (odd numbered channels): This POU supports unidirectional and bidirectional transmission systems.
16 Channel MUX or DMUX with Interleaver (even numbered channels): This POU supports unidirectional and bidirectional transmission systems, and includes an interleaver to support 16 additional channels.
Dual 1-Channel Optical Add Drop: This POU supports unidirectional transmission systems and can add/drop one channel from a DWDM line carrying up to 32 different channels.
Dual 2-Channel Optical Add Drop: This POU supports unidirectional transmission systems and can add/drop two channels from a DWDM line carrying up to 32 different channels.
Dual 4-Channel Optical Add Drop: This POU supports unidirectional transmission systems and can add/drop four channels from a DWDM line carrying up to 32 different channels.
Dual 1310 + 4x1550 MUX/DMUX: This POU provides one I/O port for 1310 nm signals and four I/O ports for 1550 nm signals. This POU supports unidirectional transmission systems and can MUX or DMUX a 1310 channel and four 1550 bands to/from a DWDM line.

Important!

The last four bulleted items in the list above describe the various OADMs and MUX/DMUX as "Dual". "Dual" is in reference to the fact that each of these specific POUs are comprised of two complete sets of OADMs or MUX/DMUX units. Thus, the dual 1-channel OADM POU contains 2 OADMs interfaces, enabling it to support 1 add/drop in each direction.

Protection

The passive optic port units support the same protection modes as the standard port units. For example, both sets of passive port units support BLSR, UPSR, and 0x1 protection. The DWDM passive OLIUs also support 1+1 protection.

MUX/DMUX example

The figure below shows 16 lines to and from Alcatel-Lucent 1665 DMX systems. The OC-48 traffic from the 8 incoming (receive) and 8 outgoing (transmit) lines is transmitted over one fiber using DWDM on the Alcatel-Lucent passive optics shelf to a remote Alcatel-Lucent passive optics shelf. The traffic is similarly transmitted and received by that system. Alternatively, the equipment can be set up to handle 16 or 32 transmit lines on one end of the passive optics unit and 16 or 32 receive lines on the other end.