100G QSFP28 O-Band DWDM 25KM SM LC Transceiver

RQ-100GDO25-XXXX Series 100G QSFP28 O-Band DWDM 25KM  SM LC Transceiver

Features

• Supports 100Gbps
• O-Band DWDM with 200GHz channel spacing
• Aligned to 800GHz spacing LAN-WDM grid
• Single 3.3V Power Supply
• Power Dissipation < 5.5W
• Up to 25km over SMF with inbuild PFEC
• QSFP28 MSA Compliant
• SFF-8636 Rev 2.10a Compliant
• 4x25G Electrical Interface
• LC Duplex Connector
• Commercial Case Temperature Range of 0°C to 70°C
• 2C Interface with Integrated Digital Diagnostic Monitoring
• Safety Certification: TUV/UL/FDA*1
• RoHS Complian

Applications

• 100GbE multiple channel transmissions using O-Band DWDM wavelengths

Ordering Information

*1: For the latest certification information, please check with FIBERWDM.

*2: XXXX refers to O-Band DWDM wavelength range as CW-WDM MSA specified, please refer the following table for detailed center wavelength information.

*3: Over G.652 SMF.

XXX-Channel refers to the following table

Transmitter

As shown in Figure 1, the transmitter path of the transceiver contains a 4x25Gbps CAUI-4 electrical input, an integrated electrical multiplexer, a SiPho driver, a diagnostic monitor, a control and bias for the MZ modulator and a single mode laser source. The integrated electrical multiplexer converts 4 channels of 25Gbps (NRZ) electrical input data to 1 channel of 100Gbps (PAM4) optical signal.

Receiver

As shown in Figure 1, the receiver path of the transceiver contains an APD, a trans-impedance amplifier (TIA), an integrated de-multiplexer and a 4x25Gbps CAUI-4 compliant electrical output block. The integrated de-multiplexer converts 1 channel of 100Gbps (PAM4) optical signal to 4 channels of 25Gbps (NRZ) electrical output data.

High Speed Electrical Signal Interface

The interface between QSFP28 module and Host ASIC is shown in Figure 2. The high speed signal lines are internally AC-coupled and the electrical inputs are internally terminated to 100 Ohms differential. All transmitter and receiver electrical channels are compliant to CAUI-4 specification per IEEE 802.3cd.

Control Signal Interface

The module has the following low speed signals for control and status: ModSelL, ResetL, LPMode/TxDis, ModPrsL, IntL/RxLOSL. In addition, there is an industry standard two wire serial interface scaled for 3.3V LVTTL. The definition of control signal interface and the registers of the serial interface memory are further defined in the Control Interface& Memory Map section.

Handling and Cleaning

Exposure to current surges and overvoltage events can cause immediate damage to the transceiver module. Observe the precautions for normal operation of electrostatic discharge sensitive equipment, and attention should also be taken to restrict exposure to the conditions defined in the absolute maximum ratings.

Optical connectors will be exposed as long as the port plug is not inserted, so always pay attention to protection. Each module is equipped with a port guard plug to protect the optical ports. The protective plug shall always be in place whenever the optical fiber is not inserted. Before inserting the optical fiber, it is recommended to clean the end of the optical fiber connector to avoid contamination of the module optical port due to dirty connector. If contamination occurs, use standard LC port cleaning methods.

Absolute Maximum Ratings

Exceeding the absolute maximum ratings table may cause permanent damage to the device. This is just an emphasized rating, and does not involve the functional operation of the device that exceeds the specifications of this technical specification under these or other conditions. Long-term operation under absolute maximum ratings will affect the reliability of the device.

Recommended Operating Conditions*4

For operations beyond the recommended operating conditions, optical and electrical characteristics are not defined, reliability is not implied, and such operations for a long time may damage the module.

*4: Power supply specifications, instantaneous, sustained and steady state current are compliant with QSFP28 MSA power classification.

*5: The position of case temperature measurement is shown in Figure 9.

*6: Power supply noise is defined as the peak-to-peak noise amplitude over the frequency range at the host supply side of the recommended power supply filter with the module and recommended filter in place. Voltage levels including peak-to-peak noise are limited to the recommended operating range of the associated power supply. See Figure 7 for recommended power supply filter.

General Electrical Characteristics

Unless otherwise stated, the following characteristics are defined under recommended operating conditions.

Reference Points

Note: Individual standards may specify unique reference points.

High Speed Electrical Input Characteristics

Unless otherwise stated, the following characteristics are defined under recommended operating conditions.

High Speed Electrical Output Characteristics

Unless otherwise stated, the following characteristics are defined under recommended operating conditions.

*7: Vcm is generated by the host. Specification includes effects of ground offset voltage.

QSFP28 Transceiver Electrical Pad Layout

Package Outline

The module is designed to meet the package outline defined in the QSFP28 MSA specification. See the package outline for details.

Figure 8: Mechanical Package Outline (All dimensions in mm)

*This 2D drawing is only for reference, please check with FIBERWDM before ordering.

The bellow picture shows the location of the hottest spot for measuring module case temperature. In addition, the digital diagnostic monitors (DDM) temperature is also calibrated to this spot.

Control Interface Electrical Specifications