Ascent’s QSFP28-100G-LP02 transceiver is designed to operate over single-mode fiber system using 4x25 CWDM channels in 1310 band and links up to 2 km over single-mode fiber. The module converts 4 inputs channel of 25 Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 100 Gb/s optical transmission. On the receiver side, the module optically demultiplexes a 100 Gb/s input into 4 CWDM channels signals, and converts them to 4 channel outputs of electrical data.
• 4 CWDM lanes mux/demux design
• Built-in CDR on both TX and RX
• Up to 25.78 Gbps data rate per wavelength
• Up to 2 km transmission on SMF
• Electrically hot-pluggable
• Digital Diagnostics Monitoring Interface
• Compliant with QSFP28 MSA with LC connector
• Case operating temperature range:0°C to 70°C
• Power dissipation < 3.5 W
• Compliant to IEEE802.3ba and 100G CLR4/CWDM4
• Compliant to SFF-8636
• RoHS compliant
Absolute Maximum Ratings
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Storage Temperature | Ts | ‑40 | ‑ | 85 | °C | |
Relative Humidity | RH | 5 | ‑ | 95 | % | |
Power Supply Voltage | Vcc | ‑0.3 | ‑ | 4 | V | |
Signal Input Voltage | Vcc‑0.3 | ‑ | Vcc+0.3 | V |
Recommended Operating Conditions
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Case Operating Temperature | Tcase | 0 | ‑ | 70 | °C | Without air flow |
Power Supply Voltage | Vcc | 3.13 | 3.3 | 3.47 | V | |
Power Supply Current | Icc | ‑ | 1060 | mA | ||
Data Rate | BR | 25.78125 | Gbps | Each channel | ||
Transmission Distance | TD | ‑ | 2 | km | ||
Coupled fiber | Single‑mode fiber | 9/125 µm SMF |
Optical Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Transmitter | ||||||
Wavelength Assignment | λ0 | 1264.5 | 1271 | 1277.5 | nm | |
λ1 | 1284.5 | 1291 | 1297.5 | nm | ||
λ2 | 1304.5 | 1311 | 1317.5 | nm | ||
λ3 | 1324.5 | 1331 | 1337.5 | nm | ||
Total Output Power | POUT | 8.5 | dBm | |||
Average Launch Power per lane | ‑6.5 | 2.5 | dBm | |||
Spectral Width (‑20 dB) | σ | 1 | nm | |||
SMSR | 30 | dB | ||||
Optical Extinction Ratio | ER | 3.5 | dB | |||
Average launch Power Off per Lane | Poff | ‑30 | dBm | |||
Transmitter and Dispersion Penalty per lane | TDP | 3 | dB | |||
RIN | RIN | ‑130 | dB/Hz | |||
Output Eye Mask definition {X1, X2, X3, Y1, Y2, Y3} | {0.31, 0.4, 0.45, 0.34, 0.38, 0.4} | 1 | ||||
Receiver | ||||||
Rx Sensitivity per lane | RSENS | ‑11.5 | dBm | 2 | ||
Input Saturation Power (Overload) | Psat | 2.5 | dBm | |||
Receiver Reflectance | Rr | ‑26 | dB |
Notes:
1. Hit ratio 5*10‑5.
2. Measured with a PRBS 231 ‑ 1 test pattern @ 25.78 Gb/s, BER < 5*10‑5.
Electrical Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Supply Voltage | Vcc | 3.13 | 3.3 | 3.47 | V | |
Supply Current | Icc | 1060 | mA | |||
Transmitter | ||||||
Input Differential Impedance | Rin | 100 | Ω | 1 | ||
Differential Data Input Swing | Vin,pp | 180 | 1000 | mV | ||
Transmit Disable Voltage | VD | Vcc–1.3 | Vcc | V | ||
Transmit Enable Voltage | VEN | Vee | Vee+ 0.8 | V | 2 | |
Receiver | ||||||
Differential Data Output Swing | Vout, pp | 300 | 850 | mV | 3 |
Notes:
1. Connected directly to TX data input pins. AC coupled thereafter.
2. Or open circuit.
3. Into 100 Ω differential termination.
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