Alpha Bridge ASFP28-25G-LR

Features

  • Compliant to 3by 25GBASE-LR.
  • Up to 25.78Gb/s data links.
  • 25G 1310nm DFB transmitter.
  • 25G PIN photo-detector.
  • 2-wire interface for management specifications compliant with SFF-8472 digital diagnostic monitoring interface for optical transceivers.
  • Operating case temperature: -40 to 85°C.
  • All-metal housing for superior EMI performance.
  • 25G electrical interface (OIF CEI-28G-VSR).
  • Maximum power consumption 5W.
  • Advanced firmware allow customer system encryption information to be stored in transceiver.
  • RoHS compliant.

Applications

  • High-speed storage area networks.
  • Computer cluster cross-connect.
  • Custom high-speed data pipes.
  • Inter Rack Connection.

Absolute Maximum Ratings

Parameter Symbol Min Max Unit Notes
Storage Temperature Tc -40 85 °C  
Operating Case Temperature Tc 0 70 °C  
Supply Voltage Vcc 0 3.6 V  
Relative Humidity RH 5 85 %  
Damage Threshold THd 3.5   dBm  

Recommended Operating Conditions

Parameter Symbol Min Type Max Unit
Case Operating Temperature Tc 0   70 °C
Power Supply Voltage Vcc 3.135 3.3 3.465 V
Data Rate, each Lane     25.78125   Gb/s
Data Rate Accuracy   -100   100 ppm
Control Input Voltage High   2   Vcc V
Control Input Voltage Low   0   0.8 V
Link Distance with G.652 D 0.002   10 km

Digital Diagnostics Functions

Parameter Symbol Accuracy Unit Notes
Temperature monitor absolute error DMI_Temp ± 3 °C Over operating Temp
Supply voltage monitor absolute error DMI_VCC ±0.1 V Full operating range
RX power monitor absolute error DMI_RX ± 2 dB dB 1
Bias Current monitor DMI_Ibias ± 10% mA  
Laser power monitor absolute error DMI_TX ± 2 dB dB 1

Electrical Characteristics ASFP28-25G-LR

Parameter Symbol Min Typical Max Unit Notes
Power Consumption       3.5 W  
Supply Current Icc     1.1 A  
Transceiver Power-on Initialization Time       2000 ms 1

Optical Characteristics ASFP28-25G-LR

Parameter           Symbol Min Typical Max Unit Notes
Wavelength Assignment L0 1264.5 1271 1277.5 nm
L1 1284.5 1291 1297.5 nm  
L2 1304.5 1311 1317.5 nm  
L3 1324.5 1331 1337.5 nm  

Transmitter Electro-optical Characteristics

Parameter Symbol Min Typ. Max Unit Notes
Power Consumption       1.5 W  
Supply Current Icc     450 mA  
Overload Differential Voltage pk-pk TP1a 900     mV  
Common Mode Voltage (Vcm) TP1 -350   2850 mV 1
Differential Termination Resistance Mismatch TP1     10 % At 1MHz
Differential Return Loss (SDD11) TP1 See CEI-28G-VSR Equation 13-19 VSR Equation dB
Common Mode to Differential Conversion and Differential to Common Mode Convention  (SDC11, SDC11) TP1 See CEI-28G-VSR Equation  13-20 dB
Stressed Input Test TP1a See CEI-28G-VSR Section 13.3.11.2.1  
Center Wavelength λt 1295   1325 nm  
Side Mode Suppression Ratio SMSR 30     dB  
Average Optical Power Pavg -7 --- 2 dBm  
OMA POMA -4   2.2 dBm 2
Launch Power in OMA minus Transmitter and Dispersion Penalty (TDP)   -5     dBm  
Transmitter Dispersion Penalty TDP     2.7 dB  
Extinction Ratio ER 3 --- --- dB  
Relative Intensity Noise RIN20OMA     -130 dB/Hz  
Optical Return Loss Tolerance TOL --- --- 20 dB  
Transmitter Reflectance RT     -26 dB  
Average Launch Power OFF Transmitter Poff     -30 dBm  
Eye Mask {X1, X2, X3, Y1, Y2, Y3} {0.31, 0.4, 0.45, 0.34, 0.38, 0.4} 3

Receiver Electro-optical Characteristics

Parameter Symbol Min Typ Max Unit Notes
Differential Voltage, pk-pk TP4     900 mV  
Common Mode Voltage (Vcm) TP4 -350   2850 mV 1
Common Mode Noise, RMS TP4     17.5 mV  
Differential Termination Resistance Mismatch TP4     10 % At 1MHz
Differential Return Loss (SDD22) TP4 See CEI-28G- VSR Equation 13-19 dB
Common Mode to Differential conversion and Differential to Common Mode conversion (SDC22, SCD22) TP4 See CEI-28G- VSR Equation 13-21 dB
Common Mode Return Loss (SCC22) TP4     -2 dB 2
Transition Time, 20 to 80% TP4 9.5     ps  
Vertical Eye Closure (VEC) TP4     5.5 dB  
Eye Width at 10-15 probability (EW15) TP4 0.57     UI  
Eye Height at 10-15 probability (EH15) TP4 228     mV  
Center Wavelength λr 1295   1325 nm  
Damage Threshold THd 3     dBm 3
Average Receive Power   -14   2 dBm  
Receive Power (OMA)       2.2 dBm  
Receiver Sensitivity (OMA) SEN         -12.1 dBm for BER =5x10-5
Stressed Receiver Sensitivity (OMA)     -9.5 dBm 4
Receiver Reflectance RR     -26 dB  
LOS Assert LOSA -30     dBm  
LOS Deassert LOSD     -14 dBm  
LOS Hysteresis LOSH 0.5     dB  
Receiver Electrical 3 dB upper Cutoff          
Frequency Fc     31 G/Hz  
Conditions of Stressed Receiver Sensitivity Test (Note 5)  
Vertical Eye Closure Penalty, each Lane     2.5   dB  
Stressed Eye J2 Jitter     0.27   UI  
Stressed Eye J4 Jitter     0.39   UI
SRS Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3} Hit ratio 5x10-5 per sample

Pin Descriptions

Pin Logic Symbol Name/Description Notes
1   VeeT Module Transmitter Ground 1
2 LVTTL-O TX_Fault Module Transmitter Fault  
3 LVTTL-I TX_Dis Transmitter Disable; Turns off transmitter laser output  
4 LVTTL-I/O SDA 2-Wire Serial Interface Data Line 2
5 LVTTL-I SCL 2-Wire Serial Interface Clock 2
6   MOD_DEF0 Module Definition, Grounded in the module  
7 LVTTL-I RS0 Receiver Rate Select  
8 LVTTL-O RX_LOS Receiver Loss of Signal Indication Active LOW  
9 LVTTL-I RS1 Transmitter Rate Select (not used)  
10   VeeR Module Receiver Ground 1
11   VeeR Module Receiver Ground 1
12 CML-O RD- Receiver Inverted Data Output  
13 CML-O RD+ Receiver Data Output  
14   VeeR Module Receiver Ground 1
15   VccR Module Receiver 3.3 V Supply  
16   VccT Module Receiver 3.3 V Supply  
17   VeeT Module Transmitter Ground 1
18 CML-I TD+ Transmitter Non-Inverted Data Input  
19 CML-I TD- Transmitter Inverted Data Input  
20   VeeT Module Transmitter Ground 1

Ordering Information ASFP28-25G-LR

Model Number Part Number Reach Input/Output Signal Detect Voltage Temperature
ASFP28-25G-LR OPAX-S10-13-IB 10km AC/AC TTL 3.3V -40°C to 85 °C
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