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GPON OLT SFP 2.5G Class C+ 20 km

ASCENT’s GPON OLT transceiver SFP-GG-SP-4931 C+ is designed for optical line terminal (OLT) for ITU-T G.984.2 Class C+ requirements Network transmission. The optical transceiver is compliant with the Small Form- Factor Pluggable (SFP) Multi-Source Agreement (MSA).

    Single-fiber bi-directional data links asymmetric TX 2488 Mbps / RX 1244 Mbps application

    1490 nm continuous-mode DFB laser transmitter and 1310 nm burst-mode APD-TIA receiver

    Small Form Factor Pluggable package with SC/UPC Connector

    Support Class C+ 17 to 32dB attenuation range application (With FEC)

    Reset burst-mode receiver design support more than 15dB dynamic range

    0 °C to 70°C operating temperature

    Single 3.3V power supply

    Digital diagnostic monitoring interface

    Digital burst RSSI function to monitor the input optical power level

    LVPECL compatible data input/output interface

    LVTTL transmitter disable control

    LVTTL transmitter laser fault alarm

    LVTTL receiver Signal Detect (SD) indication response within 50ns.

    Low EMI and excellent ESD protection

    Class I laser safety standard IEC-60825 compliant

    RoHS-6 compliance

    Complies with SFP Multi-Source Agreement (MSA) SFF-8074i

    Complies with SFF-8472 Rev 9.5

    Complies with ITU-T G.984.2 Amendment 2

    Complies with FCC 47 CFR Part 15, Class B

    Complies with FDA 21 CFR 1040.10 and 1040.11


Absolute Maximum 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Storage Ambient Temperature

TSTG

‑40


85

°C


Operating Case Temperature

Tc

0


70

°C


Operating Humidity

OH

5


95

%


Power Supply Voltage

VCC

0


4

V


Receiver Damaged Threshold


+5



dBm



 
Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Power Supply Voltage

VCC

3.13

3.3

3.47

V


Operating Case Temperature

TC

0


70

°C


Operating Humidity Range

OH

5


95

%


Nominal Data Rate



RX 1244.16

TX 2488.32


Mbit/s


 

Transmitter Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Optical Center Wavelength 

λC

1480


1500

nm


Optical Spectrum Width (‑20dB)

∆λ



1

nm


Side Mode Suppression Ratio

SMSR

30



dB


Average Launch Optical Power

AOP

+4


+7

dBm

BOL, Normal Temperature

+3


+7

dBm

BOL, 0 °C to +70 °C

Power‑OFF Transmitter Optical Power




‑39

dBm

Launched into SMF

Extinction Ratio

ER

8.2



dB

1

Tolerance to Transmitter Incident Light Power


‑15



dB


Transmitter Reflectance




‑10

dB


Transmitter and Dispersion Penalty

TDP



1

dB

Transmit on 20 km SMF

Optical Waveform Diagram

ITU‑T G.984.2

See Figure 1

Notes:

1. PRBS 223‑1+72CID @2.488Gbit/s

Transmitter Electrical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Data Input Differential Swing


600


1600

mV

LVPECL input, AC coupled

Input Differential Impedance


90

100

110

Ω


Power Supply Current




220

mA

Load free

Transmitter Disable Voltage ‑ Low


0


0.8

V


Transmitter Disable Voltage ‑ High


2.0


VCC

V


Transmitter Fault Alarm Voltage ‑ Low



0.4

V


Transmitter Fault Alarm Voltage – High


2.4


Vcc

V


410-e7.jpg

Figure 1 Transmitter Eye Mask Definitions And Test Procedure

Receiver Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Operating Wavelength


1290


1330

nm


Sensitivity

SEN



‑32

dBm

1

Saturation Optical Power

SAT

‑12



dBm

Dynamic Range


15



dB

Figure 2

Loss Of Signal De‑assert Level




‑33

dBm


Loss Of Signal Assert Level


‑45



dBm


Loss Of Signal Hysteresis

Receiver Reflectance


0.5


6

dBm


Receiver Reflectance




‑12

dB


Notes:

1. PRBS 223‑1 + 72CID @ 1.244 Gbps. BER ≤ 1 × 10‑10

410-e8.jpgFigure 2 Burst Mode Receiver Dynamic Range in GPON System

 

Receiver Electrial Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Power Supply Current




350

mA

Load free

Data Output Voltage – Low(‑Vcc)


‑1.81


‑1.62

V


Data Output Voltage – High(‑Vcc)


‑1.02


‑0.88

V


Data Output Differential Swing


400


1600

mV

LVPECL output, DC coupled

Reset width

TRESET

16



bits


Reset‑Low


0


0.4

V


Reset‑High


2.4


Vcc

V


Receiver Amplitude Recovery Time

TRECOVERY



32

bits

Refer to the reset signal falling edge

Signal Detect Assert Time




50

ns


Signal Detect De‑assert Time




12.8

ns

Refer to the reset signal rising edge

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

300



ns


RSSI Trigger width

TW

300


Tont‑TD

ns


RSSI Trigger Delay

TD

0


3000

ns


I2C Access Prohibited Time




500

μs


410-e9.jpgFigure 3 Burst Receiver Timing Sequence
410-10.jpg

Figure 4 RSSI Timing Sequence  

image.png

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