Somethings you need to Know Before Selecting CWDM SFP Transceivers

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As an extension of wavelength division
multiplexing (WDM), coarse wavelength division multiplexing (CWDM) is a
technology that multiplexes a number of optical carrier signals onto a single
optical fiber through the use of different wavelengths (i.e., colors) of laser
light.

 

A CWDM SFP (Small Form-factor
Pluggable) transceiver is a hot-swappable input/output device that plugs into
an SFP port or slot of a switch or router, linking the port with the
fiber-optic network. It is a kind of optical-electric/electric-optical
converter. With the transmitter on one end, the CWDM SFP transceiver takes in
and converts the electrical signal into light, after the optical fiber
transmission in the fiber cable plant, the receiver end again converts the
light signal into electrical signal.

 

Being a kind of compact optical
transceiver, CWDM
SFP transceiver is widely used in optical communications for both
telecommunication and data communication. It is designed for operations in
Metro Access Rings and Point-to-Point networks using Synchronous Optical
Network (SONET), SDH (Synchronous Digital Hierarchy), Gigabit Ethernet and
Fiber Channel networking equipment.

 

Three Components of CWDM SFP
Transceivers

The CWDM SFP transceiver consists of an
un-cooled CWDM Distributed Feed Back (DFB) laser transmitter, a PIN photodiode
integrated with a Trans-impedance Preamplifier (TIA) and a Microprogrammed
Control Unit (MCU). The DFB laser used in the CWDM SFP transceiver transmitter
is a 18 CWDM DFB wavelengths laser. It is well suited for high capacity reverse
traffic. Obeying the standard diode equation for low frequency signals, The PIN
photodiode has a 80km transmission distance. And the MCU is a high-speed,
executive, input-output (I/O) processor and interrupt handler for the NRL
Signal Processing Element (SPE).

 

Advantages of CWDM SFP Transceivers

Using existing fiber connections
efficiently through the adoption of active wavelength multiplexing, CWDM SFP
transceivers have improved the designs of telecommunications devices and other
technologies. Here are some advantages of CWDM SFP transceivers:

 

1. Scalability and Flexibility

CWDM SFP transceivers can support
multiple channels. It means that more channels can be activated as demand
increases. CWDM SFP transceivers have a wide variety of network configurations
that range from the meshed-ring configurations to the multi-channel
point-to-point. In point-to-point configurations, the two endpoints will
connect directly through a fiber link, allowing users to add or delete as many
as eight channels at a time.

 

2. Low Risks in Investment

Most CDWM SFP transceivers have a low
failure rate, which is less likely to be the reason why the user’s solution
fails. It helps enterprises increase the bandwidth of the Gigabit Ethernet
optical infrastructure without adding any additional fiber strands and can also
be used in conjunction with other SFP devices on the same platform. Thus the
user will be able to re-invest the capital saved by avoiding prematurely failed
devices.

 

Selecting a Right CWDM SFP Transceiver

There are many kinds of CDWM SFP
transceivers in the market. Their wavelengths are available from 1270 nm to
1610 nm, with each step 20 nm. Different CDWM SFP transceivers have different
color codes, distances, data rates and laser operating wavelengths. For example,
the CWDM-SFP-1470 transceiver, which is colored gray, is one of Cisco CWDM SFP.
It is a CWDM SFP transceiver that rates for distances up to 80 km and a maximum
bandwidth of less tan 1.5 Gbps, operating at 1470nm wavelength.

 

CWDM-SFP-1490 transceiver, however, is
designed for single mode fiber and operates at a nominal wavelength of CWDM
wavelength. Colored purple, it rates for distances up to 80 km and a maximum
bandwidth of 1.5 Gbps, operating at 1490 nm wavelength. Cisco
CWDM-SFP-1470Cisco CWDM-SFP-1490 Customers may choose a CWDM SFP transceiver in
accordance with their actual needs. Applied to the access layer of Metropolitan
Area Network (MAN), The CWDM SFP is a low-cost WDM transmission technology.

 

fiber-mart.com provides the aforesaid
CWDM-SFP-1470, CWDM-SFP-1490 and other types of CDWM SFP Transceivers, which
are convenient and cost-effective solution for the adoption of Gigabit Ethernet
and Fiber Channel (FC) in campus, data center, and metropolitan-area access
networks.