SFP Port

最後更新: 2016-08-03

SFP Port

 

SFP (Small form-Factor Pluggable)

SFP+ (enhanced small form-factor pluggable)

Features and Benefits

Hot swappable to maximize uptime and simplify serviceability

Flexibility of media and interface choice on a port-by-port basis, so you can “pay as you populate”

 


比較特別的 transceiver

 

1000BASE-LX/LH SFP for Both Multimode and Single-Mode Fibers

The 1000BASE-LX/LH SFP, compatible with the IEEE 802.3z 1000BASE-LX standard, operates on standard single-mode fiber-optic link spans of up to 10 km and up to 550 m on any multimode fibers. When used over legacy multimode fiber type, the transmitter should be coupled through a mode conditioning patch cable.

1000BASE-ZX SFP for Long-Reach Single-Mode Fibers

The 1000BASE-ZX SFP operates on standard single-mode fiber-optic link spans of up to approximately 70 km in length. The SFP provides an optical link budget of 21 dB, but the precise link span length depends on multiple factors such as fiber quality, number of splices, and connectors.

When shorter distances of single-mode fiber (SMF) are used, it might be necessary to insert an inline optical attenuator in the link to avoid overloading the receiver. A 10-dB inline optical attenuator should be inserted between the fiber-optic cable plant and the receiving port on the SFP at each end of the link whenever the fiber-optic cable span loss is less than 8 dB.

1000BASE-BX10-D and 1000BASE-BX10-U SFP for Single-Fiber Bidirectional Applications

A 1000BASE-BX10-D device is always connected to a 1000BASE-BX10-U device with a single strand of standard SMF with an operating transmission range up to 10 km.

The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices as depicted in Figure 2: 1000BASE-BX10-D transmits a 1490-nm channel and receives a 1310-nm signal, whereas 1000BASE-BX10-U transmits at a 1310-nm wavelength and receives a 1490-nm signal.

As shown, the presence of a wavelength-division multiplexing (WDM) splitter integrated into the SFP to split the 1310-nm and 1490-nm light paths.

 


DDM / DOM (Digital Diagnostic Monitor / digital optical monitoring)

 

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.

 


Multi-mode optical fiber

short distances
(data rates of 10 Mbit/s to 10 Gbit/s over link lengths of up to 600 meters)

less expensive than that for single-mode optical fiber
that the former has much larger core diameter, typically 50–100 micrometers;
much larger than the wavelength of the light carried in it.
allows the use of lower-cost electronics such as light-emitting diodes

The LED light sources sometimes used with multi-mode fiber produce a range of wavelengths and these each propagate at different speeds.

You want to "split" a single strand of single-mode fibre into different "channels" or color.

Same thing/same link.  Look at the link I've provided and do a "search" for "WDM" and you'll find them.

single-mode optical fiber (SMF)

 


Single Fiber Bidirectional SFP Transceiver

The structure of a typical single-mode fiber.
1. Core 8 μm diameter
2. Cladding 125 μm dia.
3. Buffer 250 μm dia.
4. Jacket 400 μm dia.