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1.25G SFP EX 1550 nm 40 km

ASCENT’s SFP-AG-LP-51-40 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 is capable of distances up to 40 km on 9/125 µm single-mode fiber.

•    Up to 1.25 Gbps data links

•    DFB laser transmitter and PIN photo-detector

•    Up to 40km 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

•    Single +3.3 V power supply

•    Supports Digital Diagnostic Monitoring interface

•    Compliant with SFF-8472


Absolute Maximum Ratings

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Storage Temperature

Ts

‑40


85

°C


Relative Humidity

RH

5


95

%


Power Supply Voltage

Vcc

‑0.5


4.0

V


Signal Input Voltage


‑0.3


Vcc+0.3

V


Receiver Damage Threshold


+5



dBm


Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Case Operating Temperature

Tcase

‑0


70

°C


Power Supply Voltage

VCC

3.13

3.3

3.47

V


Power Supply Current

ICC



280

mA


Power Supply Noise Rejection




100

mVp‑p


Data Rate

BR


1250/1250


Gbps

TX rate/RX rate

Transmission Distance

TD



40

km


Coupled Fiber

Single‑mode fiber

9/125 µm SMF

Transmitter Specifications

Parameter 

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Average Output Power

POUT

‑5


0

dBm 

Note (1)

Extinction Ratio 

ER 

9



dB 


Center Wavelength 

λC

1530 

1550

1570

nm 

DFB 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)


Note (2)









Note:

1. Measure at 2^7‑1 NRZ PRBS pattern 

2. Transmitter eye mask definition 


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Receiver Specifications

Parameter 

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Input Optical Wavelength 

λIN 

1270


1610

nm 

PIN‑TIA

Receiver Sensitivity 

PIN 



‑24

dBm 

Note (1) 

Input Saturation Power (Overload) 

PSAT

‑1



dBm 


LOS De‑assert 

LOSD



‑25

dBm 


LOS Assert 

LOSA

‑38



dBm 

Note (2) 

LOS Hysteresis  


 0.5 

dB 


Note:

1. Measured with Light source 1550nm, ER=9dB; BER =<10^‑12 @PRBS=2^7‑1 NRZ. 

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

Electrical Interface Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter 


Total Supply Current 

ICC 



mA 

Note (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 

Note (1) 

LOSS Output Voltage‑High

VLOSH

 2 


Vcc+0.3 

LVTTL 

LOSS Output Voltage‑Low

VLOSL

 0 


0.8 

Note:

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


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