Facing competitive pressures and rapidly accelerating user demand for interactive services, cable operators need to upgrade their network architectures. These upgrade requirements are pushing optical fiber deeper into the network. But simply replacing existing transmission lines with fiber is no longer the most cost-effective way to handle increasing bandwidth requirements. Operators are now taking advantage of advances in optical filtering that significantly increase the number of signals (or wavelengths) that can be carried on a single fiber, a process known as dDense wavelength-division multiplexing (DWDM).
Cisco® Prisma® multiplexer and demultiplexer components (Figure 1) are essential when DWDM is implemented to increase network efficiency by significantly reducing fiber counts. Most units are available in the industry-recognized, LGX-compatible form factor to allow easy, snap-in mounting in a variety of enclosures and cabinets. The LGX modules can be used in the same chassis as coupler, splitters, and patching modules to achieve high-density rack configurations. The Cisco Prisma multiplexer and demultiplexer components are also optimized to achieve low insertion loss at all wavelengths. The 40-channel wavelength parts are packaged in standard 1 or 2 RU enclosures that mount in any standard 19-inch equipment rack. A single-channel optical add-drop multiplexer (OADM) is also available in a raw filter package for outside plant applications.
Figure 1. Cisco Prisma LGX DWDM (Left), Raw Filter (Top Left), FOSC Basket (Top Right), Rack Mount Enclosure (Bottom Left), and Cassette (Bottom Right)
Features and Benefits
• Cisco Prisma multiplexer and demultiplexer modules (available in 4, 8, 12, 16, 20, and 40-channel configurations)
• Single-channel OADM available for greater design flexibility
• Channels spaced at 100 GHz or 200 GHz, following the standard ITU wavelength grid
• Wavelength mapping options that allow broadcast and narrowcast services to be combined on a single fiber
• Support for both analog and digital forward-path transmission applications, as well as reverse-path transmission applications, such as baseband digital reverse, to significantly increase bidirectional throughput
• Cisco Prisma multiplexer and demultiplexer pairs that are optimized for the lowest combined insertion loss across all wavelengths
• Module for multiplexer and demultiplexer applications
• LGX-compatible modules that easily snap into a wide variety of enclosures and cabinets
• Industry-standard SC/APC or LP/APC adapters that help ensure connector compatibility; reduce back reflection and insertion losses; simplify moves, adds, and changes; and reduce connector maintenance requirements
• LC connector option for 40-channel system to save rack space
Product Specifications
Table 1 and Table 2 provide product specifications for Cisco Prisma multiplexer and demultiplexer components.
Table 1. Unique Specifications
Specification
Units
1 Ch
OADM *
4 Ch
8 Ch
12 Ch
16 Ch
20 Ch
40 Ch
Insertion loss (maximum) 200 GHz
dB
<1.1 (add or drop)
<0.8 (other)
2.3
3.0
3.2
4.0
4.0
-
Insertion loss (maximum) 100 GHz multiplexer and demultiplexer
dB
<1.1 (add or drop)
<0.8 (other)
-
3.2
-
-
-
4.5
Isolation (maximum)
dB
>30 (add or drop)
>12 (other)
>30 (adjacent channels)
>40 (nonadjacent channels)
Dimensions
Depth (maximum)
in.
cm
6.26
15.9
6.26
15.9
6.26
15.9
6.26
15.9
6.26
15.9
6.26
15.9
11.5
29.2
Width
in.
cm
1.15
2.9
1.15
2.9
2.3
5.8
3.45
8.7
3.45
8.7
4.60
11.7
19.0
48.3
Height
in.
cm
4.0
10.2
4.0
10.2
4.0
10.2
4.0
10.2
4.0
10.2
4.0
10.2
1.75 or 3.50
4.4 or 8.8
Faceplate height
in.
cm
5.1
13.0
5.1
13.0
5.1
13.0
5.1
13.0
5.1
13.0
5.1
13.0
* Single-channel OADM raw filter dimensions Ø 5.5 mm x 36 mm with 900 µm loose tube and with SC/APC connectors.
Table 2. General Specifications
Specification
Units
200 GHz Specifications
100 GHz Specifications
Channel bandwidth @ -0.5 dB
nm
λc ± 0.25 (-5º to 65ºC)
λc ± 0.125 (-5º to 65ºC)
Channel spacing
GHz
200
100
Polarization dependent loss (PDL)
dB
≤ 0.20 (-5º to 65ºC)
≤ 0.25 (-5º to 65ºC)
Polarization mode dispersion (PMD)
ps
≤ 0.15 (-5º to 65ºC)
≤ 0.15 (-5º to 65ºC)
Directivity
dB
≥ 55
≥ 55
Optical return loss
dB
≥ 45
≥ 45
Optical connector type
SC/APC adapters or LC/APC
SC/APC adapters or LC/APC
Environment Specifications
Operating temperature range
ºC
-40 to 65
-40 to 65
Storage temperature range
ºC
-40 to 80
-40 to 80
Notes:
• Losses include input/output and common connector losses.
• Recommended for use in noncondensing environments only.
• Unless otherwise noted, specifications are based on measurements made in accordance with NCTA recommended practices for measurements made on cable systems using standard frequency assignments.
Warranty Information
Warranty information is available on Cisco.com at the Product Warranties page.
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For More Information
Cisco Prisma DWDM Passives products include some of the industry's most complete range of high-performance components. For additional information, please go to: http://www.cisco.com/en/US/products/ps8981/index.html.
