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155M SFP 1550 nm 80 km

ASCENT’s SFP-AF-LP-51-80 Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the DFB laser and the PIN photo-detector. The module data link up to 80 km in 9/125um single mode fiber.

    Up to 155 Mb/s data links

    DFB laser transmitter and PIN photo-detector

    Up to 80 km on 9/125 µm SMF

    Hot-pluggable SFP footprint

    Duplex LC/UPC type pluggable optical interface

    Low power dissipation

    Metal enclosure, for lower EMI

    RoHS compliant and lead-free

    Support Digital Diagnostic Monitoring interface

    Single +3.3V power supply

    Compliant with SFF-8472

    Case operating temperature

    Commercial: 0°C to +70°C

    Extended: -10°C to +80°C

    Industrial: -40°C to +85°C


Absolute Maximum Ratings 

Item

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Storage Temperature 

Ts 

‑40


85

 °C 


Relative Humidity 

RH

5


95 

 % 


Power Supply Voltage 

VCC

‑0.5



Signal Input Voltage 


‑0.3


Vcc+0.3 


Receiver Damage Threshold 


+5



dBm 


 

Recommended Operating Conditions 

Item

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Case Operating Temperature

Tcase

0


70

 °C 

Commercial

‑10


80

Extended

‑40


85 

Industrial

Power Supply Voltage 

VCC

3.13

3.3 

3.47 


Power Supply Current 

ICC 



300

mA 


Data Rate



155/155


Mbps

TX Rate/RX Rate

Transmission Distance




80

km


Coupled Fiber

Single‑mode fiber

9/125 µm SMF

 

Specification of Transmitter

Item

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Average Output Power

POUT

‑5


0

dBm 

1

Extinction Ratio 

ER 

8.2



dB 


Center Wavelength 

λC 

1530

1550

1570

nm 

FP Laser

Side Mode Suppression Ratio

SMSR

30



dB


Spectrum Bandwidth (‑20 dB)

σ



1

nm


Transmitter OFF Output Power 

POff 



‑45

dBm 


Differential Line Input Impedance

RIN

90

100

110

Ω


Output Eye Mask 

Compliant with IEEE802.3 z (class 1 laser safety)

2

Notes:

1. Measure at 223‑1 NRZ PRBS pattern. 

2. Transmitter eye mask definition 

 407-e5.png407-e6.png

 

Specification of Receiver 

Item

Symbol 

Min. 

Typ. 

Max. 

Unit 

Notes

Input Optical Wavelength 

λIN 

1270


1610

nm 


Receiver Sensitivity 

PI



‑33

dBm 

1

Input Saturation Power (Overload) 

PSAT

‑3



dBm 


LOS De‑assert 

LOSD



‑34

dBm 


LOS Assert 

LOSA

‑45



dBm 

2

LOS Hysteresis 


 0.5 

dB 


 Notes:

1. Measured with Light source 1550 nm, ER = 8.2 dB; BER = <10‑12 @ PRBS=223‑1 NRZ. 

2. When LOS de‑asserted, the RX data ± output is high‑level (fixed).

 

Electrical Interface Characteristics

Item

Symbol

Min.

Typ.

Max.

Unit

Notes

Transmitter 

Total Supply Current 

ICC 



mA 

1

Transmitter Disable Input‑High 

VDISH

2


Vcc+0.3


Transmitter Disable Input‑Low

VDISL

0


0.8

V


Transmitter Fault Input‑High

VTxFH

2


Vcc+0.3

V


Transmitter Fault Input‑Low

VTxFL

0


0.8 


Receiver 

Total Supply Current 

ICC 



mA 

1

LOSS Output Voltage‑High

VLOSH

 2 


Vcc+0.3 

LVTTL 

LOSS Output Voltage‑Low

VLOSL

 0 


0.8 

Notes:

1. A (TX) + B (RX) = 280 mA (Not including termination circuit) 


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