Overview

GSFP-LX-40KM

The SFP transceivers are high performance, cost effective modules supporting dual data-rate of 1.25Gbps and 40KM transmission distance with SMF.The transceiver consists of three sections: a FP laser transmitter, a PIN 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). For further information, please refer to SFP MSA.

Application

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

  Features

  • Dual data-rate of 1.25Gbps operation
  • 1310nm FP laser and PIN photo detector for 40km transmission
  • Digital Diagnostic Monitoring
  • Internal Calibration or External Calibration
  • Compatible with RoHS

+3.3V single power supply

  • Operating case temperature:
  • Standard : 0 to +70°C
  • Industrial : -40°C to +85°C
  • Compliant with SFP MSA

Specification

    Absolute Maximum Ratings

Parameter

Symbol

Min

Max

Unit

Supply Voltage

Vcc

0

+4

V

Storage Temperature

Tst

-40

+85

ºC

Operating

Relative Humidity

Rh

5

85

%

Operation Environment

Parameter

Symbol

Min

Typical

Max

Units

Supply Voltage

Vcc

3.13

3.3

3.47

V

Operating

Case Temperature

Commercial

Tc

0

70

ºC

Industrial

-40

85

Power Dissipation

1

W

Power Supply Current

Icc

300

mA

Data Rate

1.25

Gbps

Optical and Electrical Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter

Centre Wavelength

λc

1290

1310

1330

nm

Spectral Width

(RMS)

∆λ

3

nm

Average Output

Power

Pout

-5

0

dBm

1

Extinction Ratio

ER

8

dB

Optical Rise/Fall

Time (20%~80%)

tr/tf

0.16

ns

Data Input Swing

Differential

VIN

400

1800

mV

2

Input Differential

Impedance

ZIN

90

100

110

Ω

TX

Disa ble

Disable

2.0

Vcc

V

Enable

0

0.8

V

TX

Faul t

Fault

2.0

Vcc

V

Normal

0

0.8

V

Receiver

Centre Wavelength

λc

1260

1620

nm

Receiver Sensitivity

-23

dBm

3

Receiver Overload

-3

dBm

3

LOS De-Assert

LOSD

-24

dBm

LOS Assert

LOSA

-35

dBm

LOS Hysteresis

1

4

dB

Data Output Swing

Differential

Vout

700

900

mV

4

LOS

High

2.0

Vcc

V

Low

0.8

V

Notes:

  1. The optical power is launched into SMF.
  2. PECL input, internally AC-coupled and terminated.
  3. Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.
  4. Internally AC-coupled.

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_clo

ck

400

KHz

MOD_DEF (0:2)-High

VH

2

Vcc

V

MOD_DEF (0:2)-Low

VL

0.8

V

Diagnostics

Parameter

Range

Unit

Accuracy

Calibration

Temperature

0 to +70

°C

±3°C

Internal / External

-40 to +85

Voltage

3.0 to 3.6

V

±3%

Internal /

External

Bias Current

0 to 100

mA

±10%

Internal /

External

TX Power

-5 to 0

dBm

±3dB

Internal /

External

RX Power

-24 to -3

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 Description

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. It’s 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

  1. 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

  1. LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.
  2. RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.
  3. TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.