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Cisco ONS 15200 Series DWDM Systems

Cisco ONS 15216 Fiber Bragg Grating Dispersion Compensation Units Data Sheet

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Product Overview

Chromatic dispersion is a transmission impairment caused by the varying, frequency-dependent velocity of the components of an optical signal as it traverses an optical fiber. Traditionally, the effects of chromatic dispersion are mitigated by inserting lengths of dispersion-compensating fiber (DCF), within dispersion compensation units (DCU), into the signal path. While robust, cost effective, and widely deployed, DCF-based DCUs introduce significant network latency due to the additional propagation delay caused by the several kilometers of fiber they contain. New latency-sensitive network applications, such as high-frequency trading, real-time, interactive video, and cloud-based services demand the lowest possible latency and, therefore, a new approach to dispersion compensation. Fiber Bragg grating (FBG) dispersion compensation provides the same benefits as DCF-based compensation, but with lower and consistent loss, enhanced immunity to nonlinear effects, and almost no added latency.

Figure 1. Cisco ONS 15216 Fiber Bragg Grating Dispersion Compensation Unit.

KM35137

Cisco ONS 15216 Fiber Bragg Grating Dispersion Compensation Units (FBG DCUs) complement the existing suite of Cisco ONS 15216 DCF DCUs, allowing network operators to choose the DCU technology that is most appropriate for their network requirements. Offered in ten increments between 165 picoseconds per nanometer (ps/nm) and 1983 ps/nm, Cisco ONS 15216 FBG DCUs (Figure 1) allow complete and accurate dispersion compensation for fiber of any length, because they can be cascaded, as well as used at the transmit or receive end (or both) of a network link. The addition of passive inventory capability through an integrated USB port allows Cisco ONS 15216 FBG DCUs to be managed and inventoried with Cisco Transport Controller and Cisco Prime™ Optical when used with the Cisco ONS 15454 Multiservice Transport Platform (MSTP) M6 or M2 chassis.

Applications

Replacement of existing DCF-based DCUs to lower network latency

Remote passive inventory of DCU modules

Dispersion compensation for new, latency-sensitive, metro, or long-haul networks

Features and Benefits

Uniform latency below 25 nanoseconds

Uniform insertion loss below 3 dB

100-GHz channel grid support

Slope-matched to G.652 fiber

Support for all wavelength rates, including 10-Gbps, 40-Gbps, and 100-Gbps

Point-to-point, ring, and mesh network architectures supported

Passive inventory support with Cisco ONS 15454 MSTP M2 and M6 chassis

Ideal for single-stage amplification

ROHS 6–compliant

The Cisco ONS 15216 Dispersion Compensator Shelf (Figure 2) occupies one rack unit, and can hold up to two DCUs.

Figure 2. Cisco ONS 15216 Dispersion Compensator Shelf

HBD02113 copy

The Cisco ONS 15216 FBG DCU can be installed in the dispersion compensation shelf in the following configurations:

The first slot in the shelf is used for east-to-west traffic, and the second slot is used for west-to-east traffic (Figure 3).

The first slot in the shelf is used for west-to-east traffic, and the second slot is used for east-to-west traffic (Figure 3).

Both slots can be cascaded together east-to-west. In this case, the output of the first unit in the first slot is connected to the input of the second unit in the second slot. This configuration provides higher chromatic dispersion compensation than an individual module can provide (Figure 4).

Both slots can be cascaded together west-to-east. In this case, the output of the first unit in the first slot is connected to the input of the second unit in the second slot. This configuration provides higher chromatic dispersion compensation than an individual module can provide (Figure 4).

Figure 3. Single-Shelf DCU Application East-to-West and West-to-East

Note: In Figures 3 and 4, the triangular symbol represents an amplifier.

Figure 4. Cascaded DCU Shelf per Direction

Product Specifications

Tables 1 through 3 provide product specifications for the Cisco 15216 Fiber Bragg Grating Dispersion Compensation Units.

Table 1. Optical Specifications

Part Number

Band

Channel Spacing (nm)

Max. Pin

Latency

Clear BW

Max. IL

Max. PMD

Max. PDL

Max. ORL

CD Comp.

Ref. λ

Min.

Max.

(mW)

(ns)

(GHz)

(dB)

(ps)

(dB)

(dB)

(ps/nm)

(nm)

15216-FBGDCU-165=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

165

1545.31

15216-FBGDCU-331=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

331

1545.31

15216-FBGDCU-496=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

496

1545.31

15216-FBGDCU-661=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

661

1545.31

15216-FBGDCU-826=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

826

1545.31

15216-FBGDCU-992=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

992

1545.31

15216-FBGDCU-1157=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

1157

1545.31

15216-FBGDCU-1322=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

1322

1545.31

15216-FBGDCU-1653=

C

1528.77

1566.31

500

25

50

4.5

1

0.3

40

1653

1545.31

15216-FBGDCU-1983=

C

1528.77

1566.31

500

25

45

4.5

1

0.3

40

1983

1545.31

nm = Nanometers

pin = Input Power

BW = Bandwidth

IL = Insertion Loss

PMD = Polarization Mode Dispersion

PDL = Polarization Dependent Loss

ORL = Optical Return Loss

CD Comp. = Chromatic Dispersion Compensation

Ref. λ = Reference Wavelength

Table 2. Environmental Specifications

Parameter

Description

Operating temperature range

23° to 140°F (–5 to 60°C)

Storage temperature range

–40° to 158°F (–40 to 70°C)

Operating humidity range

5 to 85% relative humidity

Table 3. Mechanical Specifications

Mechanical Specification

Description

Connector type

LC and UPC

Overall dimensions (H x W x D)

1.61 x 8.19 x 9.76 in.(41 x 208 x 248 mm)

Weight

7.1 lb (3.22 kg)

Ordering Information

To place an order, visit the Cisco Ordering homepage and refer to Table 4 for part numbers.

To download software, visit the Cisco Software Center: http://www.cisco.com/en/US/ordering/index.shtml.

Table 4. Ordering Information

Module

Product ID

Product Description

Compensation

FBGDCU-165

15216-FBGDCU-165=

FBG-based DCM for C band, SMF-28, –165 ps/nm nominal dispersion @ 1545.31 nm

165 ps/nm

FBGDCU-331

15216-FBGDCU-331=

FBG-based DCM for C band, SMF-28, –331 ps/nm nominal dispersion @ 1545.31 nm

331 ps/nm

FBGDCU-496

15216-FBGDCU-496=

FBG-based DCM for C band, SMF-28, –496 ps/nm nominal dispersion @ 1545.31 nm

496 ps/nm

FBGDCU-661

15216-FBGDCU-661=

FBG-based DCM for C band, SMF-28, –661 ps/nm nominal dispersion @ 1545.31 nm

661 ps/nm

FBGDCU-826

15216-FBGDCU-826=

FBG-based DCM for C band, SMF-28, –826 ps/nm nominal dispersion @ 1545.31 nm

826 ps/nm

FBGDCU-992

15216-FBGDCU-992=

FBG-based DCM for C band, SMF-28, –992 ps/nm nominal dispersion @ 1545.31 nm

992 ps/nm

FBGDCU-1157

15216-FBGDCU-1157=

FBG-based DCM for C band, SMF-28, –1157 ps/nm nominal dispersion @ 1545.31 nm

1157 ps/nm

FBGDCU-1322

15216-FBGDCU-1322=

FBG-based DCM for C band, SMF-28, –1322 ps/nm nominal dispersion @ 1545.31 nm

1322 ps/nm

FBGDCU-1653

15216-FBGDCU-1653=

FBG-based DCM for C band, SMF-28, –1653 ps/nm nominal dispersion @ 1545.31 nm

1653 ps/nm

FBGDCU-1983

15216-FBGDCU-1983=

FBG-based DCM for C band, SMF-28, –1983 ps/nm nominal dispersion @ 1545.31 nm

1983 ps/nm