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SFP GPON OLT D+ Transceiver

ASCENT’s GPON OLT transceiver SFP-GG-SP-4931 D+ is designed for optical line terminal (OLT) for ITU-T G.984.2 Class D+ requirements Network transmission. The optical transceiver is compliant with the Small Form- Factor Pluggable (SFP) Multi-Source Agreement (MSA). The GPON OLT SFP module is contained in a SFP package with SC/UPC receptacle connector. The module consists of 1490nm DFB laser, InGaAs APD, Preamplifier and WDM filter in a high-integrated optical sub-assembly, and it transmits up to 2.5Gbps of continuous data at 1490nm and receives 1.25Gbps burst-mode data at 1310nm. The module data links up to 20km in 9/125um single mode fiber. Ascent GPON SFP is a low-cost point to multi point (P2MP) Fiber to the Home, Business or Curb (FTTX) GPON OLT transceiver. It is fabricated with a rugged die cast metal housing and cage assembly. Commercial and industrial temperature ranges are available. It is IEC 60825-1 Class I laser safety compliant and meets the EEC Directive 2002/95/EC for RoHS compliance.

·         ITU-T G.984.2 GPON OLT D+

·         Bi-directional 2.5Gbps Tx and 1.25Gbps Rx

·         1490nm continuous-mode transmitter with DFB LD

·         1310nm burst-mode receiver with APD-TIA

·         Digital diagnostic monitoring

·         SFP package with SC/UPC receptacle optical interface

·         Single +3.3V power supply

·         Operation case temperature

        -40 to 85°C

·         RoHS6 compliance

Absolute Maximum Ratings

Parameter

Symbol

Min.

Max.

Unit

Note

 

Storage Temperature

TstG

-40

85

°C


Operating Case Temperature

Tc

0

70

°C


Operating Humidity

OH

5

95

%


Power Supply Voltage

VCC

0

3.6

V


Receiver Damage Threshold


+5


dBm



Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Power Supply Voltage

VCC

3.13

3.3

3.47

V


Power Supply Current



350

500

mA


Operating Case Temperature

Tc

0


70

°C


Operating Humidity Range

OHo

5


85

%


Nominal Data Rate



Tx 1244.16

Rx  2488.32


Mbit/s



Transmitter Optical Specifications

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Optical Center Wavelength


1480


1500

nm


Optical Spectrum Width (-20dB)

∆λ



1

nm


Side Mode Suppression Ratio

SMSR

30



dB


Average Launch Optical Power

AOP

+6


+10

dBm

EOL, 0~70°C

Power-OFF Transmitter Optical Power




-39

dBm

Launched into SMF

Extinction Ratio

ER

8.2



dB

PRBS223-1+72CID @2.488Gbit/s

Tolerance to Transmitter Incident Light


-15



dB


Transmitter Reflectance




-10

dB


Transmitter and Dispersion Penalty

TDP



1

dB

Transmit on 20km SMF

Optical Waveform Diagram

ITU-T G.984.2

Figure 1,margin>5%

Output Eye Mask

Compliant with ITU5T G.984.2 Mask



Transmitter Electrical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Data Input Differential Swing


600


1600

mV

LVPECL input, AC coupled

Input Differential Impedance


90

100

110

Ω


Transmitter Disable Voltage - Low


0


0.8

V


Transmitter Disable Voltage - High


2.0


VCC

V


Transmitter Fault Alarm Voltage - Low


0


0.4

V


Transmitter Fault Alarm Voltage - High


2.4


VCC

V


image.png

                                Transmitter Eye Mask Definitions and Test Procedure

Receiver Optical Characteristics 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Operating Wavelength

SEN

1290


1330

nm


Sensitivity (EOL, 0~70°C)



-35

dBm

PRBS223- 1+72CID@1.244Gbps BER ≤1×10-4 ,ER≥10dB

Saturation Optical Power





dBm


Dynamic Range


15



dB

Figure 2

SD Signal Assert Level




-36

dBm


SD Signal De-assert Level


-45



dBm


Hysteresis


0.5


6

dB


Receiver Reflectance




12

dB


image.png
                                Burst Mode Receiver Dynamic Range in GPON System

Receiver Electrical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Data Output Voltage – Low


Vcc-1.81


Vcc-1.62

V


Data Output Voltage – High(-Vcc)


Vcc-1.02


Vcc-0.88

V


Data Output Differential Swing


400


1600

mV

LVPECL output, DC coupled

Reset with

TRESET

16



bits


Reset-Low


0


0.4

V


Reset- High


2.4


Vcc

V


Receiver Amplitude Recovery

TRECOVERY



32

bits

Refer to the Reset signal falling

Signal Detect Assert Time




50

ns


Signal Detect De-assert Time




12.8

ns

Refer to the Reset signal rising

Signal Detect Voltage-Low


0


0.4

V


Signal Detect Voltage- High


2.4


Vcc

V


RSSI Trigger-Low


0


0.8

V


RSSI Trigger- High


2.0


Vcc

V


Optical Signal During Time

Tont

1200



ns


Data Output Voltage – Low


Vcc-1.81


Vcc-1.62

V


Data Output Voltage – High(-Vcc)


Vcc-1.02


Vcc-0.88

V


Data Output Differential Swing


400


1600

mV

LVPECL output, DC coupled

Reset with

TRESET

16



bits


Reset-Low


0


0.4

V


Reset- High


2.4


Vcc

V


Receiver Amplitude Recovery

TRECOVERY



32

bits

Refer to the Reset signal falling

Signal Detect Assert Time




50

ns


Signal Detect De-assert Time




12.8

ns

Refer to the Reset signal rising

Signal Detect Voltage-Low


0


0.4

V


Signal Detect Voltage- High


2.4


Vcc

V


RSSI Trigger-Low


0


0.8

V


RSSI Trigger- High


2.0


Vcc

V


Optical Signal During Time

Tont

1200



ns


RSSI Trigger- High


2.0


Vcc

V


Optical Signal During Time

Tont

1200



ns



Digital Diagnostic Monitoring

Parameter

Range

Accuracy

Calibration

Note

Temperature

0 to +70 °C

±3°C

Internal

1LSB = 1/256°C

Voltage

3.0 to 3.7 V

±3%

Internal

1LSB = 0.1mV

Bias Current

0 to 100 mA

±10%

Internal

1LSB = 2uA

TX Power

1.5 to 5 dBm

±2dB

Internal

1LSB = 0.1uW

RX Power Monitor

-30 to -8 dBm

±3dB

External

1LSB = 0.1uW

Note: The digital diagnostic monitoring interface defines 256-byte memory map in EEPROM, which makes use of the 8 bit address 1010001X(A2h).

image.png
                                   Mechanical Dimensions

image.png
               Timing Parameter Definitions in Burst More Sequence

image.png
                                    
RSSI TIMING SEQUENCE

image.png
    
                                          SFP Network
image.png


                         
SFP Pin (Golden Finger) Drawing
image.png

                                   Typical Interface Circuit

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