RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km Optical Transceiver

QSFP+ 40G ER4 1310nm 40km Optical Transceiver Module QSFP-40G-ER4 CISCO, HUAWEI, H3C, Juniper, D-link, HP, IBM, dell, Mikrotik, Aruba,Quidway Compatible This product is a transceiver module designed for 2m-10km optical communication applications. The design is compliant to 40GBASE-LR4 of the IEEE P802.3ba standard.

What Is RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km Optical Transceiver Module

RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km Optical Transceiver Module QSFP-40G-ER4 CISCO, HUAWEI, H3C, Juniper, D-link, HP, IBM, dell, Mikrotik, Aruba,Quidway Compatible This product is a transceiver module designed for 2m-10km optical communication applications. The design is compliant to 40GBASE-LR4 of the IEEE P802.3ba standard. The module converts 4 inputs channels (ch) of 10Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 40Gb/s input into 4 CWDM channels signals, and converts them to 4 channel output electrical data.The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm as members of the CWDM wavelength grid defined in ITU-T G.694.2. It contains a duplex LC connector for the optical interface and a 38-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module.

Product Features RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km

  1. Compliant with 40G Ethernet IEEE802.3ba and 40GBASE-LR4 Standard
  2. QSFP+ MSA compliant
  3. Compliant with QDR/DDR Infiniband data rates
  4. Up to 11.2Gb/s data rate per wavelength
  5. 4 CWDM lanes MUX/DEMUX design
  6. Up to 40km transmission on single mode fiber (SMF)
  7. Operating case temperature: 0 to 70??
  8. Maximum power consumption 2.5W
  9. LC duplex connector
  10. RoHS compliant

Applications RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km

  1. 40GBASE-ER4 Ethernet Links
  2. Infiniband QDR and DDR interconnects
  3. Client-side 40G Telecom connections
QSFP+ 40G ER4 1310nm 40km Optical Transceiver Module RT-QSFP-40G-ER4
QSFP+ 40G ER4 1310nm 40km Optical Transceiver Module RT-QSFP-40G-ER4

Absolute Maximum Ratings

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Storage TemperatureTS-4085??
Operating Case TemperatureTOP070??
Power Supply VoltageVCC-0.53.6V
Relative Humidity (non-condensation)RH085%
Damage Threshold, each LaneTHd3.3dBm

Recommended Operating Conditions and Power Supply Requirements

Operating Case TemperatureTOP070??
Power Supply VoltageVCC3.1353.33.465V
Data Rate, each Lane10.3125Gb/s
Control Input Voltage High2VCCV
Control Input Voltage Low00.8V
Link Distance with G.652D0.00240km

Electrical Characteristics

The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

ParameterTest PointMinTypicalMaxUnitNotes
Power Consumption2.5W
Supply CurrentICC0.7A
Transceiver Power-on Initialization Time2000ms1
Transmitter (each Lane)
Single-ended Input Voltage Tolerance (Note 2)-0.34.0VReferred to TP1 signal common
AC Common Mode Input Voltage Tolerance15mVRMS
Differential Input Voltage Swing Threshold50mVppLOSA Threshold
Differential Input Voltage SwingVin,pp190700mVpp
Differential Input ImpedanceZin90100110ohm
Differential Input Return LossSee IEEE 802.3ba 86A.4.11dB10MHz- 11.1GHz
J2 Jitter ToleranceJt20.17UI
J9 Jitter ToleranceJt90.29UI
Data Dependent Pulse Width Shrinkage (DDPWS ) Tolerance0.07UI
Eye Mask Coordinates {X1, X2, Y1, Y2}0.11, 0.31 95, 350UI mVHit Ratio = 5×10-5
Receiver (each Lane)
Single-ended Output Voltage-0.34.0VReferred to signal common
AC Common Mode Output Voltage7.5mVRMS
Differential Output Voltage SwingVout,pp300850mVpp
Differential Output ImpedanceZout90100110ohm
Termination Mismatch at 1MHz5%
Differential Output Return LossSee IEEE 802.3ba 86A.4.2.1dB10MHz- 11.1GHz
Common Mode Output Return LossSee IEEE 802.3ba 86A.4.2.2dB10MHz- 11.1GHz
Output Transition Time28Ps20% to 80%
J2 Jitter OutputJo20.42UI
J9 Jitter OutputJo90.65UI
Eye Mask Coordinates {X1, X2, Y1, Y2}0.29, 0.5, 150, 425UI mVHit Ratio = 5×10-5


  1. Power-on Initialization Time is the time from when the power supply voltages reach and remain above the minimum recommended operating supply voltages to the time when the module is fully functional.
  2. The single ended input voltage tolerance is the allowable range of the instantaneous input signals.

Optical Characteristics

Wavelength AssignmentL01264.512711277.5nm
Side Mode Suppression RatioSMSR30dB
Total Average Launch PowerPT8.3dBm
Average Launch Power, each LanePAVG-42.3dBm
Optical Modulation Amplitude (OMA), each LanePOMA-43.5dBm1
Difference in Launch Power between any Two Lanes (OMA)Ptx,diff6.5dB
Launch Power in OMA minus Transmitter and Dispersion Penalty (TDP), each Lane-4.8dBm
TDP, each LaneTDP2.6dB
Extinction RatioER3.5dB
Relative Intensity NoiseRIN-128dB/Hz12dB reflection
Optical Return Loss ToleranceTOL20dB
Transmitter ReflectanceRT-12dB
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}
Average Launch Power OFF Transmitter, each LanePoff-30dBm
Damage Threshold, each LaneTHd3.3dBm2
Total Average Receive Power8.3dBm
Average Receive Power, each Lane-13.72.3dBm
Receiver ReflectanceRR-26dB
Receiver Sensitivity (OMA), each LaneSEN-11.5dBm
Stressed Receiver Sensitivity (OMA), each Lane-9.6dBm3
Difference in Receive Power between any Two Lanes (OMA)Prx,diff7.5dB
LOS AssertLOSA-28dBm
LOS DeassertLOSD-15dBm
LOS HysteresisLOSH0.5dB
Receiver Electrical 3 dB upper Cutoff Frequency, each LaneFC12.3GHz
Conditions of Stress Receiver Sensitivity Test (Note 5)
Vertical Eye Closure Penalty, each Lane1.9dB
Stressed Eye J2 Jitter, each Lane0.3UI
Stressed Eye J9 Jitter, each Lane0.47UI


  1. Even if the TDP < 0.8 dB, the OMA min must exceed the minimum value specified here.
  2. The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. The receiver does not have to operate correctly at this input power.
  3. Measured with conformance test signal at receiver input for BER = 1×10-12.
  4. MVertical eye closure penalty and stressed eye jitter are test conditions for measuring stressed receiver sensitivity. They are not characteristics of the receiver.

Digital Diagnostic Functions

The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

Temperature monitor absolute errorDMI_Temp-3+3??Over operating temperature range
Supply voltage monitor absolute errorDMI_VCC-0.1+0.1VOver full operating range
Channel RX power monitor absolute errorDMI_RX_Ch-2+2dB1
Channel Bias current monitorDMI_Ibias_Ch-10%+10%mA
Channel TX power monitor absolute errorDMI_TX_Ch-2+2dB1


1. Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB fluctuation, or a +/- 3 dB total accuracy.

What is an (Fiber) Optical Transceiver

An Optical transceiver module is the core part of optical communication devices. It uses fiber optical technology to send and receive data through completing the process of optical signal – electrical signal / electrical signal – optical signal conversion. An optical transceiver module consists of two parts: the receiving part and the transmitting part. The receiving part realizes the photo-electric conversion, and the transmitting part realizes the electro-optical conversion.

Usually, one end of the transceiver will be connected to a cable and the opposite end of will have a special connector for fitting it into specific models of enterprise-grade Ethernet switches, routers or network interface cards

How to Classify Optical Transceivers

In order to meet a variety of needs of transmission, the manufacturers launched a variety of categories of optical modules. Below are some common methods to classify them.

1)Sort by Rate

400GE optical transceiver module,

200GE optical transceiver module,

100GE optical transceiver module,

40GE optical transceiver module,

25GE optical transceiver module,

10GE optical transceiver module and etc.

2)Sort by Package

The higher the transmission rate of the optical transceiver, the more complex the structure. In order to meet the needs of different structures, a variety of packaging types of optical transceiver modules were designed. For example, XFP, SFP, SFP+ for 10G transceivers, QSFP+ for 40G transceivers, CFP4, CFP2 and QSFP28 for 100G transceivers, as well as the latest OSFP and QSFP-DD for 400G transceivers.

  • XFP (10GB Small Form-factor Pluggable) optical module: “X” is the abbreviation of Roman numerals 10, all XFP modules are 10G optical module. The XFP optical module supports LC fiber optic connectors and supports hot plugging. Compared to SFP+ and SFP optical modules, XFP optical modules are larger and longer.
  • SFP (Small Form-factor Pluggable) optical module: smaller than XFP, SFP optical modules support LC fiber optic connectors, hot plugging.
  • SFP+ (Small Form-factor Pluggable Plus) optical module: SFP+ refers to the increased rate of SFP module, sensitive to EMI.
  • QSFP+ (Quad Small Form-factor Pluggable Plus) optical module: four-channel small hot plugging optical module. The QSFP + optical module supports MPO fiber connectors, which are larger in size than SFP + optical modules.
  • CFP (Centum Form-factor Pluggable) optical module: length ?? width ?? height of CFP is defined as 144.75mm ?? 82mm ?? 13.6mm, high-speed, hot plugging and supporting for data communications and telecommunications applications.
  • QSFP28 optical module: the interface package size of QSFP28 is the same with QSFP+, which is mainly used in Data Center application.
  • OSFP (Octal Small Form Factor Pluggable) optical module: the OSFP is a new pluggable form factor with eight high speed electrical lanes that will initially support 400 Gbps (8x50G). It is slightly wider and deeper than the QSFP but it still supports 32 OSFP ports per 1U front panel, enabling 12.8 Tbps per 1U.
  • QSFP-DD (Quad Small Form Factor Pluggable Double Density) optical module: QSFP-DD is a new module and cage/connector system similar to current QSFP, but with an additional row of contacts providing for an eight lane electrical interface. It is being developed by the QSFP-DD MSA as a key part of the industry??s effort to enable high-speed solutions.
Optical Transceiver Module classification
Optical Transceiver Module classification
Optical Transceiver Module classification
Optical Transceiver Module classification


3)Sort by Physical Layer Standard

In order to allow the data to be transmitted in different conditions and applications, optical communication industry defined of a variety of different physical layer standards, which resulting in a variety of optical transceiver modules supporting different standards.

For example, IEEE and MSA industry alliances have set several criteria for the 100G QSFP28 optical modules, like SR4, LR4, ER4, PSM4, CWDM4 and etc.

4)Sort by Pattern

As we all know, fiber can be divided into single-mode fiber and multi-mode fiber. In order to use different type of fiber, we also classify optical transceiver modules into single-mode optical modules and multi-mode optical modules.

Single-mode optical module is used to match single-mode fiber with better transmission capacity, which is suitable for long-distance transmission.

Multi-mode optical module is used to match multi-mode fiber. Multimode fiber has the defect of mode dispersion, its transmission performance is poorer than single-mode fiber. However, with better cost performance, they are popular in smaller capacity, short distance transmission.

How to choose the right optical module

With the rapid development of information technology, the application of optical communication has become more and more popular. With the advantages of large capacity and high-speed transmission, Fiber Optic Transceiver Modules is playing a more and more important role. Where there is fiber, the optical module is needed, and the selection and purchase of the optical module has become the focus of the front-line engineering technicians or purchasing personnel.
There are many types of optical transceivers on the market, often dazzling. So, how to choose the most suitable module in many different speed, different packaging, different functions of the Optical Transceiver Module We will give you some tips.

Choose the module based on your usage environment

How fast the speed of transmission you need 155M, 1G, 10G or 100G The higher transmission rate means higher cost investment. For example, the application environment of FTTH, it’s enough to use about 1G speed products for current bandwidth. It’s not necessary to choose 10G products with more money.

Optical Transceiver Module Data Rate
Optical Transceiver Module Data Rate

Transmission distance

The common optical modules are divided into short distance (300M-2KM), middle distance (10KM-40KM), long distance (>40km), The farther the transmission distance, the higher the technical and technological requirements of the optical module.

Optical Transceiver Module Transmission Distance
Optical Transceiver Module Transmission Distance

Modules Compatibility

Modules Compatibility
Modules Compatibility

When purchasing optical modules, need to confirm whether it can be compatible with your devices. Common switch brands like CISCO, HUAWEI, H3C, Juniper, D-link, HP, IBM, dell, Mikrotik etc., modules need to be tested compatibility before shipment. Before purchasing, it is best to confirm that it can be perfectly compatible with the corresponding brand switch.

Select the original one or compatible one according to the budget situation

The original module is reliable but the price is too high, compatible module is cost-effective, comparable to the original module. Different users need to make specific choices according to the budget.

After-sale service

Although the optical module is a mature optical communication device, most manufacturers’ products are stable and reliable. However, there may be some problems in the use after purchase, so choose the vendors who have after-sales service and technical support are more secure.
RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km



RT-QSFP-40G-ER4 40GBASE-ER4 QSFP+ 1310nm 40km

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