Sfp 1.25gbps 120km 1550nm

Features

  • Dual data-rate of 1.25Gbps/1.063Gbps operation
  • 1550nm DFB laser and APD photodetector for 120km transmission
  • Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
  • Compatible with SONET OC-24-LR-1
  • Compatible with RoHS
  • 3.3V single power supply
  • Operating case temperature: Standard : 0 to 70°C Extended : -20 to 85°C

Applications

  • Gigabit Ethernet
  • Fiber Channel
  • Switch to Switch interface
  • Switched backplane applications
  • Router/Server interface
  • Other optical transmission systems

Description

The SFP transceivers are high performance, cost effective modules supporting dual data-rate of 1.25Gbps/1.0625Gbps and 120km transmission distance with SMF.

The transceiver consists of three sections: a DFB laser transmitter, a APD photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.

The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For furtherinformation, please refer to SFP MSA.

Absolute Maximum Ratings

Table 1  Absolute Maximum Ratings

Parameter

Symbol

Min

Max

Unit

Supply Voltage Vcc -0.5 4.5 V
Storage Temperature Ts -40 85 °C
Operating Humidity 5 85 %

 

Recommended Operating Conditions

Table 2 – Recommended Operating Conditions

Parameter

Symbol

Min

Typical

Max

Unit

 

Operating Case Temperature

Standard  

Tc

0 70 °C
Extended -20 85 °C
Power Supply Voltage Vcc 3.13 3.3 3.47 V
Power Supply Current Icc 300 mA
 

Data Rate

Gigabit Ethernet 1.25  

Gbps

Fiber Channel 1.063

 

Optical and Electrical Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter
Centre Wavelength λc 1520 1550 1580 nm
Spectral Width (-20dB) ∆λ 1 nm
Average Output Power Pout 0 5 dBm 1
Extinction Ratio ER 9 dB
Optical Rise/Fall Time (20%~80%) tr/tf 0.26 ns
Data Input Swing Differential VIN 400 1800 mV 2
Input Differential Impedance ZIN 90 100 110 Ω
 

TX Disable

Disable 2.0 Vcc V
Enable 0 0.8 V
 

TX Fault

Fault 2.0 Vcc V
Normal 0 0.8 V
Receiver
Centre Wavelength λc 1260 1580 nm
Receiver Sensitivity -31 dBm 3
Receiver Overload -9 dBm 3
LOS De-Assert LOSD -32 dBm
LOS Assert LOSA -45 dBm
LOS Hysteresis 0.5 4.5 dB
Data Output Swing Differential Vout 370 1800 mV 4
 

LOS

High 2.0 Vcc V
Low 0.8 V

  

Table 3 – Optical and Electrical Characteristics Notes:

1. The optical power is launched into SMF.

2.PECLinput,internallyAC-coupledandterminated.

3.MeasuredwithaPRBS27-1testpattern@1250Mbps,BER≤1×10-12.

4. Internally AC-coupled.

Timing and Electrical

T able 4  Timing and Electrical

Parameter

Symbol

Min

Typical

Max

Unit

Tx Disable Negate Time t_on 1 ms
Tx Disable Assert Time t_off 10 µs
Time To Initialize, including Reset of Tx Fault t_init 300 ms
Tx Fault Assert Time t_fault 100 µs
Tx Disable To Reset t_reset 10 µs
LOS Assert Time t_loss_on 100 µs
LOS De-assert Time t_loss_off 100 µs
Serial ID Clock Rate f_serial_clock 400 KHz
MOD_DEF (0:2)-High VH 2 Vcc V
MOD_DEF (0:2)-Low VL 0.8 V

 

Diagnostics

Table 5 – Diagnostics Specification

Parameter

Range

Unit

Accuracy

Calibration

Temperature 0 to 70 °C ±3°C Internal / External
-20 to 85
Voltage 3.0 to 3.6 V ±3% Internal / External
Bias Current 0 to 100 mA ±10% Internal / External
TX Power 0 to 5 dBm ±3dB Internal / External
RX Power -30 to -9 dBm ±3dB Internal / External

 

Digital Diagnostic Memory Map

The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).

The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.

 

The digital diagnostic memory map specific data field defines as following.

Pin Definitions 

Pin Diagram 

Pin Descriptions

Pin

Signal Name

Description

Plug Seq.

Notes

1 VEET Transmitter Ground 1
2 TX FAULT Transmitter Fault Indication 3 Note 1
3 TX DISABLE Transmitter Disable 3 Note 2
4 MOD_DEF(2) SDA Serial Data Signal 3 Note 3
5 MOD_DEF(1) SCL Serial Clock Signal 3 Note 3
6 MOD_DEF(0) TTL Low 3 Note 3
7 Rate Select Not Connected 3
8 LOS Loss of Signal 3 Note 4
9 VEER Receiver ground 1
10 VEER Receiver ground 1
11 VEER Receiver ground 1
12 RD- Inv. Received Data Out 3 Note 5
13 RD Received Data Out 3 Note 5
14 VEER Receiver ground 1
15 VCCR Receiver Power Supply 2
16 VCCT Transmitter Power Supply 2
17 VEET Transmitter Ground 1
18 TD Transmit Data In 3 Note 6
19 TD- Inv. Transmit Data In 3 Note 6
20 VEET Transmitter Ground 1

Notes:

 Plug Seq.: Pin engagement sequence during hot plugging.

1) TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc 0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low state, the output will be pulled to less than 0.8V.

2) TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a

4.7k~10kΩ resistor. Its states are:

Low (0 to 0.8V): Transmitter on

(>0.8V, < 2.0V): Undefined

High (2.0 to 3.465V): Transmitter Disabled

Open: Transmitter Disabled

3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.

Mod-Def 0 is grounded by the module to indicate that the module is present

Mod-Def 1 is the clock line of two wire serial interface for serial ID Mod-Def 2 is the data line of two wire serial interface for serial ID

4) LOS is an open collector output, which should be pulled up

 

 Recommended Interface Circuit

 Mechanical Dimensions

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