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1.25G SFP 1310 nm 10 km

ASCENT’s SFP-AG-LP-31-10 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 1310nm FP laser and the PIN/TIA. The module data link up to 20 km in 9/125 µm Single-mode fiber. This transceiver meets the Small Form Pluggable (SFP) industry standard package utilizing an integral LC-Duplex optical interface connector. An enhanced Digital Diagnostic Monitoring Interface compliant with SFF-8472 has been incorporated into the transceiver. It allows real time access to the transceiver operating parameters such as transceiver temperature, laser bias current, transmitted optical power, and received optical power and transceiver supply voltage by reading a built-in memory with I2C interface. The optical output can be disabled by a LVTTL logic highlevel input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of Signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.

    Up to 1.25 Gb/s data links

    FP laser transmitter and PIN photo-detector

    Up to 10(20) 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

    Single +3.3 V power supply

    Supports Digital Diagnostic Monitoring interface

    Compliant with SFF-8472 and IEEE802.3z

    Switch to Switch Interface

    Gigabit Ethernet

    Switched Backplane Applications

    Router/Server Interface

    Other Optical Links


Absolute Maximum Ratings

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Storage Temperature

TS

-40


85

°C


Storage Ambient Relative Humidity

HA

0


85

%


Power Supply Voltage

VCC

-0.5


4

V


Signal Input Voltage


-0.3


Vcc+0.3

V


Receiver Damage Threshold


+3



dBm


Lead Soldering Temperature/Time

TSOLD



260/10

°C/sec

1

Lead Soldering Temperature/Time

TSOLD



360/10

°C/sec

2

Notes:

1.   Suitable for wave soldering.

2.   Only for soldering by iron.

Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Case Operating Temperature

Tcase

0


+70

°C

Commercial



-40


+85

°C

Industrial

Ambient Humidity

HA

5


70

%

Non-condensing

Power Supply Voltage

VCC

3.13

3.3

3.47

V


Power Supply Current

Icc



280

mA


Data Rate



1250/1250


Mbps

TX rate/RX rate

Transmission Distance




20

km


Coupled Fiber

Single-mode fiber







Specification of Transmitter

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Average Output Power

POUT

-9


-3

dBm


Extinction Ratio

ER

9



dB


Center Wavelength

λC

1260

1310

1360

nm


Spectrum Bandwidth (RMS)

σ



3.5

nm

FP Laser

Transmitter OFF Output Power

POff



-45

dBm


Jitter p-p

tJ



0.1

UI

1

Output Eye Mask

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

2


Notes:

1.   Measure at 27-1 NRZ PRBS pattern.

2.   Transmitter eye mask definition.

image.png

 Specification of Receiver

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Input Optical Wavelength

λIN

1270


1610

nm


Receiver Sensitivity

PIN



-24

dBm

1

Input Saturation Power (Overload)

PSAT

-3



dBm


Loss of Signal Assert

PA

-45



dBm


Loss of Signal De-assert

PD



-24.5

dBm

2

LOS Hysteresis

PD-PA

0.5


6

dB


Notes:

1.   Measured with light source 1310 nm, ER = 9 dB; BER ≤ 10-12 @ PRBS = 27-1 NRZ

2.   When LOS De-asserted, the RX data± output is signal output.


Digital Diagnostic Memory Map


image.png


Digital Diagnostic Monitoring Information

Parameter

Unit

Accuracy

Case Temperature

°C

±3

Supply Voltage

V

±3%

Tx Bias Current

mA

±10%

Tx Optical Power

dB

±3

Rx Optical Power

dB

±3

 
Electrical Interface Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter

Total Supply Current

ICC



A

mA

1

Transmitter Disable Input-High

VDISH

2


Vcc+0.3

V

LVTTL

Transmitter Disable Input-Low

VDISL

0


0.8

V

LVTTL

Transmitter Fault Input-High

VTxFH

2


Vcc+0.3

V

LVTTL

Transmitter Fault Input-Low

VTxFL

0


0.8

V

LVTTL

Receiver







Total Supply Current

ICC



B

mA

1

LOS Output Voltage-High

VLOSH

2


Vcc+0.3

V

LVTTL

LOS Output Voltage-Low

VLOSL

0


0.8

V

LVTTL

Note 1: A (TX)+ B (RX) = 280 mA (Not include termination circuit)






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