Types of pluggable optical modules (SFP/eSFP/SFP+/XFP/CFP/CFP2/CXP/QSFP/CDFP)

Опубликовано 2018-1-15 21:45:18 3141 0 5 1


Most optical  interfaces in optical communications now are pluggable optical modules. There are  several types of these modules. This article is compilation of several Huawei  and Internet published documents, which describe types of pluggable optical  modules.

 The SFP/eSFP/SFP+/XFP/CFP/CFP2/CXP is  a hot-swappable, protocol-independent optical transceiver used in optical  communications for both telecommunication and data communications applications.

1.     SFP

1.1.   SFP appearance

1.2.  SFP Functional Block Diagram

1.3.  SFP description

SFP - small form-factor pluggable optical module also known as mini-GBIC. Compact, hot-pluggable transceiver. The SFP transceiver is not standardized by any official standards body, but rather is specified by a multi-source agreement (MSA) among competing manufacturers.

If yousee eSFP, the "e" - refers to with monitoring function, which can detect the alarm module, temperature, performance, etc., the vast majority of optical modules are eSFP, and outside on the reunification called SFP; SFP rate is usually less than 5 Gbit/s.

Modern optical SFP transceivers support digital diagnostics monitoring (DDM) functions according to the industry-standard SFF-8472. This feature is also known as digital optical monitoring (DOM). Modules with this capability give the end user the ability to monitor parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage, in real time.

SFP transceivers are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type (e.g. multi-mode fiber or single-mode fiber). Optical SFP modules are commonly available in several different categories:

  • for multi-mode fiber, with black or beige extraction lever
    • SX - 850 nm, for a maximum of 550 m at 1.25 Gbit/s (Gigabit Ethernet) or 150m at 4.25 Gbit/s (Fibre Channel)
  • for single-mode fiber, with blue extraction lever
    • LX - 1310 nm, for distances up to 10 km
    • EX - 1310 nm, for distances up to 40 km
    • ZX - 1550 nm, for distances up to 80 km, with green extraction lever
    • EZX - 1550 nm, for distances up to 120 km
    • BX - 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-Uand BS-D for Uplink and Downlink respectively, also for distances up to 10 km. Variations of bidirectional SFPs are also manufactured which use 1550 nm in one direction.
    • 1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)
    • SFSW – Single Fiber Single Wavelength transceivers, for bi-directional traffic on a single fiber. Coupled with CWDM, these double the traffic density of fiber links.
    • CWDM and DWDM transceivers at various wavelengths achieving various maximum distances
  • for copper twisted pair cabling
    • 1000BASE-T - these modules incorporate significant interface circuitry and can only be used for Gigabit Ethernet, as that is the interface they implement. They are not compatible with (or rather: do not have equivalents for) Fibre channel or SONET.

2.     SFP+

2.1.   SFP+ appearance

2.2.  SFP+ Functional Block Diagram

SFP+without the retimer module

SFP+with the retimer module

2.3.  SFP+ description

The enhanced small form-factor pluggable (SFP+) is an enhanced version of the SFP that supports data rates up to 10 Gbit/s. The SFP+ specification was first published on May 9, 2006, and version 4.1 published on July 6, 2009. SFP+ supports 8 Gbit/s Fibre Channel, 10 Gigabit Ethernet and Optical Transport Network standard OTU2. It is a popular industry format supported by many network component vendors.

SFP+ module have the same package with SFP, but the rate is much higher than the SFP, close to XFP (10 Gbit / s).

In comparison to earlier XENPAK or XFP modules, SFP+ modules leave more circuitry to be implemented on the host board instead of inside the module.

Consideration has to be given to whether the module is linear or limiting. Linear SFP+ modules are most appropriate for 10GBASE-LRM; otherwise, limiting modules are preferred.

3.     XFP

3.1.   XFP appearance

3.2.  XFP Functional Block Diagram

3.3.  XFP description

The XFP (10 Gigabit Small Form Factor Pluggable) is a standard for transceivers for high-speed computer network and telecommunication links that use optical fiber. It was defined by an industry group in 2002, along with its interface to other electrical components which is called XFI.

XFP modules are hot-swappable and protocol-independent. They typically operate at near-infrared wavelengths (colors) of 850 nm, 1310 nm or 1550 nm. Principal applications include 10 Gigabit Ethernet, 10 Gbit/s Fibre Channel, synchronous optical networking (SONET) at OC-192 rates, synchronous optical networking STM-64, 10 Gbit/s Optical Transport Network (OTN) OTU-2, and parallel optics links. They can operate over a single wavelength or use dense wavelength-division multiplexing techniques. They include digital diagnostics that provide management that were added to the SFF-8472 standard. XFP modules use an LC fiber connector type to achieve high density.

The XFP specification was developed by the XFP Multi Source Agreement Group. It is an informal agreement of an industry group, not officially endorsed by any standards body. The first preliminary specification was published on March 27,2002. The first public release was on July 19, 2002. It was adopted on March 3,2003, and updated with minor updates through August 31, 2005. The chair of the XFP group was Robert Snively of Brocade Communications Systems, and technical editor was Ali Ghiasi of Broadcom.

The physical dimensions of the XFP transceiver are slightly larger than the original smallform-factor pluggable transceiver (SFP). One of the reasons for the increase in size is to allow for on-board heat sinks for greater cooling.

XFP are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type (e.g. multi-mode fiber or single-mode fiber). XFP modules are commonly available in several different categories:

·        SR - 850 nm, for a maximum of300 m

·        LR - 1310 nm, for distances upto 10 km

·        ER - 1550 nm, for distances upto 40 km

·        ZR - 1550 nm, for distances upto 80 km


4.     CFP

4.1.   CFP appearance







4.2.  CFP Functional Block Diagram







4.3.  CFP description

The C form-factor pluggable (CFP) is a multi-source agreement to produce a common form-factor for the transmission of high-speed digital signals. The C stands forthe Latin letter C used to express the number 100 (centum), since the standard was primarily developed for 100 Gigabit Ethernet systems.

The CFP was designed after the small form-factor pluggable transceiver (SFP) interface, but is significantly larger to support 100 Gbit/s. While the electrical connection of a CFP uses 10x10 Gbit/s lanes in each direction (RX, TX) the optical connection can support both 10x10 Gbit/s and 4x25 Gbit/s variants of 100 Gbit/s interconnects (typically referred to as 100GBASE-SR10 in 100 meter MMF, 100GBASE-LR10 and 100GBASE-LR4 in 10 km SMF reach, and 100GBASE-ER10 and 100GBASE-ER4 in 40 km SMF reach respectively.)

In March 2009, Santur Corporation demonstrated a 100 Gigabit pluggable CFP transceiver prototype.

CFP transceivers can support a single 100 Gbit/s signal like 100GbE or OTU4 or one or more 40 Gbit/s signals like 40GbE, OTU3, or STM-256/OC-768. 

5.     CXP

5.1.   CXP appearance


5.2.  CXP Functional Block Diagram

5.3.  CXP description

12 channels extended-capability form-factor pluggable

A form-factor in development within the InfiniBAnd Trade Association (IBTA) ElectoMechanical Working Group (EWG) supports up to 12 lanes of media including copper, optics and active cable assemblies at 10 GBd signal rates. The electrical interface is based on a two-high, stacked, edge-connector similar to that for PCI Expressx16. It offers high port density (27 mm pitch) but has limited power dissipation (< 6 W).


6.     QSFP


6.1.   QSFP appearance


40G QSFP+ SR4 (150m, 300m)

40G QSFP+ LR4 (10km)


6.2. QSFP description


40 GE, 4x10 G parallel optics/electrical. Dimensions - 18.4 x 72 x 8.5 mm


7.     CDFP


6.1.   CDFP appearance


6.2.   CDFP description

Projected form factor evaluation for 400G pluggable module


1.      Small form-factor pluggable transceiver http://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver

2.     XFPtransceiver http://en.wikipedia.org/wiki/XFP_transceiver

3.     OptiX OSN9800 Planning Your Network, Product Version: V100R001C01, LibraryVersion: 01

4.     Common Pluggable Interface For100GBASE-CR10 & 100GBASE-SR10, John Petrilla, Avago Technologies GalenFromm, Molex, May 2009

5. 100G_Poster_EXFO

6. "400G Technologies: New challenges that lie ahead" from EXFO

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