Tag Archives: DWDM SFP

100G DWDM QSFP: The Enabler of 100G Long Distance Connectivity


100G transmission within data centers has made possible by using standard optical transceivers such as CFP and QSFP28 transceiver modules. Though they offer perfect fits for transferring 100G traffic within the rack and the data center, it becomes a problem when 100G traffic needs to be transported over long distances, like connectivity between geographically dispersed data centers over long distance (say over 40 km). This is where 100G DWDM QSFP transceiver finds its role to play. DWDM technology is nothing new to us since DWDM SFP transceivers have adopted in volume to expand 10G network capacity. 100G DWDM QSFP is very similar to its predecessor in regard to functionality, but it is typically applied in 100G network over longer span.

100G transmission distance

Why 100G DWDM QSFP Becomes the New Fashion

Traditional DWDM solutions are designed for telecom carries that most companies cannot afford, which hinders it for being used in data centers. However, data centers are confronted with the ongoing demand for expanding network capacity over longer distances. Which drives the needs to replicate or transfer traffic between geographically separated data centers. In this case, either conventional DWDM solution or QSFP28 transceiver is sufficient. 100G DWDM QSFP transceiver thus becomes the technology of choice for transporting 100G traffic over long distances (up to 80 km) or as part of a DWDM network.

100G DWDM QSFP: The Longer Reach, More Agile Solution

100G DWDM QSFP is based on an advanced modulation technique – PAM4. It takes the same form factor as 100G QSFP28 transceiver and can be used directly on switches with QSFP28 slots. The main advantages of DWDM QSFP PAM4 is the easiness to use regular electronics and optical components suitable for QSFP28 form factor. The power consumption is dramatically reduced and can be used for data center interconnect application. The drawbacks, however, is that DWDM QSFP PAM4 requires amplification and dispersion compensation system on the optical link for reach longer than 5km at 100Gbits.


QSFP DWDM PAM4 provides a cost effective solution for metro Data Center Interconnect (DCI) for up to 80km reach at 100 Gigabit/s speed. The 100G DWDM QSFP leverages IEEE CAUI-4 4x25G electrical interface and is compatible with standard 100G QSFP28 ports. On the optical side, it combines two wavelengths into a duplex fiber with the center wavelength aligning with 100GHz grid. 100G DWDM QSFP PAM4 is available in 40 different channels on the 100GHz ITU-T grid to provide a maximum bandwidth of 4Tbps over a single pair of fiber.

100G DWDM QSFP: Application in Data Center Interconnect (DCI)

Interconnecting geographically dispersed data centers is critical to maintain application agility to meet various business needs, while data intensive applications are driving the rapid growth of cloud networks. 100G DWDM QSFP transceiver delivers up to 4Tbps of bandwidth for up to 80km reach between data centers. This can be achieved by using DWDM Mux/Demux, amplifier and dispersion compensator. The Mux/Demux combines the different wavelengths of light into a pair of fiber. EDFA are used to boosts the signal. And a dispersion compensator is needed for applications over 5km. And DWDM is providing for efficient use of the single fiber pair with up to 40 wavelength multiplexed.



The emerge of 100G DWDM QSFP PAM4 is a significant step forward in overcoming the difficulties of DWDM networking in data center equipment. ACG Research covering data center service providers indicated that 30-80 km optical reach is needed for about 30% of their data center interconnections, which predicts the prosperity of 100G DWDM QSFP transceiver.

Use Cisco DWDM SFP+ to Connect DWDM Transport to Your Cisco 10G Switches

Dense Wavelength Division Multiplexing (DWDM) enables carrier’s networks to accommodate many hundreds of aggregated services of any sub-rate protocol without installing additional dark fiber. DWDM SFP+ transceiver is mainly manufactured for carriers and large enterprises that need a scalable, flexible, cost-effective system for multiplexing, transporting and protecting high-speed data, storage, voice and video applications. The Cisco DWDM SFP+ transceiver modules are fiber line cards for a wide variety of Cisco switches, routers, and other equipment. They allow enterprises and service providers to provide scalable and easy-to-deploy 10-Gbps LAN, WAN, and optical transport network (OTN) services in their networks.

Cisco DWDM SFP+ Transceiver Channels

According to DWDM ITU (ITU-T G.694.1) channels, Cisco DWDM SFP+ transceivers are provided with 40 channels, from C20 1561.41nm to C59 1530.33nm (shown in the table below).

PN. ITU Channel PN. ITU Channel PN. ITU Channel
DWDM-SFP10G-61.41 C20 1561.41 nm DWDM-SFP10G-50.12 C34 1550.12 nm DWDM-SFP10G-38.98 C48 1538.98 nm
DWDM-SFP10G-60.61 C21 1560.61 nm DWDM-SFP10G-49.32 C35 1549.32 nm DWDM-SFP10G-38.19 C49 1538.19 nm
DWDM-SFP10G-59.79 C22 1559.79 nm DWDM-SFP10G-48.51 C36 1548.51 nm DWDM-SFP10G-37.40 C50 1537.40 nm
DWDM-SFP10G-58.98 C23 1558.98 nm DWDM-SFP10G-47.72 C37 1547.72 nm DWDM-SFP10G-36.61 C51 1536.61 nm
DWDM-SFP10G-58.17 C24 1558.17 nm DWDM-SFP10G-46.92 C38 1546.92 nm DWDM-SFP10G-35.82 C52 1535.82 nm
DWDM-SFP10G-57.36 C25 1557.36 nm DWDM-SFP10G-46.12 C391546.12 nm DWDM-SFP10G-35.04 C53 1535.04 nm
DWDM-SFP10G-56.55 C26 1556.55 nm DWDM-SFP10G-45.32 C40 1545.32 nm DWDM-SFP10G-34.25 C54 1534.25 nm
DWDM-SFP10G-55.75 C27 1555.75 nm DWDM-SFP10G-44.53 C41 1544.53 nm DWDM-SFP10G-33.47 C55 1533.47 nm
DWDM-SFP10G-54.94 C28 1554.94 nm DWDM-SFP10G-43.73 C42 1543.73 nm DWDM-SFP10G-32.68 C56 1532.68 nm
DWDM-SFP10G-54.13 C29 1554.13 nm DWDM-SFP10G-42.94 C43 1542.94 nm DWDM-SFP10G-31.90 C57 1531.90 nm
DWDM-SFP10G-53.33 C30 1553.33 nm DWDM-SFP10G-42.14 C44 1542.14 nm DWDM-SFP10G-31.12 C58 1531.12 nm
DWDM-SFP10G-52.52 C31 1552.52 nm DWDM-SFP10G-41.35 C45 1541.35 nm DWDM-SFP10G-30.33 C59 1530.33 nm
DWDM-SFP10G-51.72 C32 1551.72 nm DWDM-SFP10G-40.56 C46 1540.56 nm
DWDM-SFP10G-50.92 C33 1550.92 nm DWDM-SFP10G-39.77 C47 1539.77nm

Cisco Switches Support for Cisco DWDM SFP+

In fact, not all Cisco switches can be supported for DWDM SFP+ transceivers. According to Cisco 10-Gigabit Ethernet Transceiver Modules Compatibility Matrix, there are 72 types of Cisco switches are available to support DWDM SFP+ transceivers. But only 19 of them can support be supported all 40 channels DWDM SFP+ transceivers (shown in the table below).

Switches Series Models
Cisco Nexus 3000 Series N3K-C3016Q-40GE, N3K-C3064PQ-10GE, N3K-C3064TQ-10GT, N3K-C3064PQ-10GX
Cisco Nexus 3100 Series N3K-C3132Q-40GE, N3K-C3132Q-40GX, N3K-C3132Q-XL, N3K-C3132Q-V, N3K-C3172PQ-10GE, N3K-C3172TQ-10GT, N3K-C3172PQ-XL, N3K-C3172PQ-XL, N3K-C3172TQ-XL, N3K-C31108PC-V, N3K-C31108PC-V
N3K-C31108TC-V, N3K-C31128PQ-10GE
Cisco Nexus 3200 Series N3K-C3264Q, N3K-C3232C
Cisco Nexus 3500 Series N3K-C3548P-10G , N3K-C3524P-10G, N3K-C3548P-10GX, N3K-C3524P-10GX

To build a complete DWDM network in your system, except for switches and DWDM SFP+ transceivers, you also usually need a DWDM mux/demux module. At present, DWDM mux/demux modules are available in 2 channels to 96 channels. Since Cisco DWDM SFP+ transceivers are available in 40 channels (from C20 1561.41nm to C59 1530.33nm ), now I will take 40 channels C20-C59 DWDM mux/demux module (show in the figure below) for example to explain how it works.

40 channels DWDM mux demux

Front panel of above 40 channels C20-C59 DWDM mux/demux module are shown in the figure below. Connectors, located on the front of the DWDM mux/demux modules, are labeled and use the same channel that is used to indicate the wavelength of the individual DWDM transceivers.

DWDM muxdemux
Use a pair of 40 channels C20-C59 DWDM mux/demux modules, 40 signals can be transmitted over one fiber pair, which greatly reduces the cabling cost.

40 DWDM muxdemux
Now, let’s use Cisco compatible DWDM SFP+ to connect DWDM transport to your Cisco 10G SFP+ switches!

Cisco Compatible DWDM SFP+

How Many SFP Module Types Do You Know

How many modules types do you know? Yes, I know. From the Fiberstore, I find this answer.The Fiber Optic Transceivers have a full range of sfp modules. Fiberstore supply various kinds of SFP module 100% compatible with Cisco SFP, HP SFP, Juniper SFP, Netgear SFP, DELL SFP, CWDM SFP, DWDM SFP, BIDI SFP, 10G SFP and so on.So many types of SFP transceiver , I will detail several types sfp tansceiver modules.

SFP Module Types

First SFP Module Types: CWDM SFP

The CWDM SFP (small form-factor pluggable) transceiver is really a compact optical transceiver used in optical communications for both telecommunication and data communications applications on the wavelength. CWDM SFP are used to link the ports to the fiber optic network, typical CWDM SFP like Cisco’s could support both Gigabit Ethernet and Fiber Channel. CWDM SFP transceiver modules make use of the SFP interface for connecting the equipment and use dual LC PC fiber connector interface for connecting the optical network. FiberStore CWDM SFP transceivers can be found with a variety of different transmitter and receiver types, allowing users to decide on the appropriate transceiver for each link to provide the required optical reach over the available optical fiber.

Second SFP Module Types: DWDM SFP

The Dense Wavelength-Division Multiplexing (DWDM) transceivers offer DWDM transport with dramatically lower power and cost in a standard pluggable SFP package. Fiberstore DWDM SFP is available in all 100 GHz C/L-band wavelengths on the DWDM ITU grid. As multirate interfaces they support any protocol from 100 Mbps to 4.25 Gbps. The modules meet the requirements of the IEEE802.3 Gigabit Ethernet standard and ANSI Fiber Channel specifications, they are suitable for interconnections in Gigabit Ethernet and Fiber Channel environments. The DWDM SFP is designed to accept DWDM SONET/SDH (with or without FEC) for 200km links and Ethernet/Fiber Channel protocol traffic for 80km links.

Third SFP Module Types: 10G SFP

The 10G SFP Transceiver Modules refers to 10G SFP Plus Transceivers,someone know that the sfp+ is an enhanced version of the SFP that supports data rates up to 10 Gbit/s. Several standards for 10G SFP has been released, 10GBase-SR is for OM3 multimode optical fiber, relevant SFP plus working distance 300 meters max, 10GBase-LR is for single mode optical fiber, relevant SFP plus working distance 10km, 10GBase-LRM is for FDDI multimode fiber, the SFP plus working distance 220 meters.

Want to know more SFP Module Types, pls visit fs.com, We will continue to update fiber optic transceiver information.Our optical transceivers are backed by a lifetime warranty, and you can buy with confidence. We also can customize optical transceivers to fit your specific requirements.

Related Article: How Much Do You Know About SONET/SDH SFP Module?

Related Article: How Many Types of SFP Transceivers Do You Know