9dBm GPON OLT SFP Class C+++ D 1.244Gbps SFP Transceiver Modules

Basic Information
Place of Origin: Shenzhen, China
Brand Name: Gigaopto
Certification: CE, FCC, ROHS, ISO9001, ISO14000, MSDS, REACH, CP65, TUV, UL
Model Number: GTS-SGT21-20DCG
Minimum Order Quantity: 1
Price: negotiable
Packaging Details: Static bag, Plastic bag, Retail box or by required
Delivery Time: 1-5 work days
Payment Terms: T/T, L/C
Supply Ability: 50,000pcs/month
Detail Information
Product Name: GPON OLT SFP Type: Class C+++/D 9dBm
Wavelength: 1490nm-TX/1310nm-RX Interface: SC Simplex
Bit Rate(Gb/s): 2.5Gb/s_TX/1.25Gb/s_RX DDMI: Yes
Keywords: +9dBm Class C+++/D GPON OLT SFP Transceiver
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1.244Gbps SFP Transceiver Modules

Product Description

GPON OLT SFP Class C+++ / D TX Power 9dBm Transceiver Module




Part Number GTS-SGT21-20DCG Category GPON OLT Class C+++/D
Packaging SFP Power Supply Voltage +3.3V
Connector Type SC UPC Optical Transmission 20km
Digital Diagnostic Supported Cable Type 9/125μm SMF
Warranty 3 years Operating Temperature -5~70°C / -40~85°C
Bit Rate (Downstream) 2.488Gbps Bit Rate (Upstream) 1.244Gbps
Center Wavelength (TX) 1490nm Center Wavelength (RX) 1310nm
Power Dissipation <1.5W Total Current (Max) 450mA
Transmitter Type DFB Receiver Type APD
TX Output Power 9dBm (Typical) RX Sensitivity < -32.0dBm
Extinction Ratio >8.2dB Receiver Overload >-15dBm
Protocols SFF-8472, ITUT-984.2



  • LVPECL compatible data input/output interface
  • LVTTL transmitter disable control
  • LVTTL transmitter laser fault alarm
  • Fast LVTTL receiver Signal Detect (SD) indication response
  • Low EMI and excellent ESD protection
  • Class I laser safety standard IEC-60825 compliant
  • RoHS6 Compliance
  • Single fiber bi-directional data links asymmetric TX 2488Mbps/RX1244Mbps application
  • 1490nm continuous-mode DFB laser transmitter and 1310nm burst-mode APD-TIA receiver
  • Small Form Factor Pluggable package with SC/UPC Connector
  • Operating case temperature Range:Commercial: -5°C~70°C, Industrial: -40°C~85°C
  • Single 3.3V power supply
  • Digital diagnostic monitoring interface
  • Digital burst RSSI function to monitor the input optical power level




The GIGAOPTO's GTS-SGT21-20DCG is a high performance transceiver module for single fiber communications using a 1490nm continuous-mode transmitter and a 1310nm burst-mode receiver. It is designed to meet ITU G.984.2 Class C+++ (Class D) requirements for optical line terminal (OLT) applications.

The 1490nm DFB LD transmitter has automatic power control (APC) function and temperature compensation circuitry to ensure stable optical power and extinction ratio over all operating temperature range. The transmitter meets Class 1 eye safety per IEC60825 and CDRH standards.

The receiver has a hermetically packaged APD-TIA (trans-impedance amplifier) pre-amplifier and a limiting amplifier with LVPECL compatible differential outputs. It features a Burst Packet Detect (SD) output which is LVTTL compatible. The SD output will come high after receiving the burst packet.

The 9dBm module provides digital diagnostic information of its operating conditions and status, including transmitting power, laser bias current, module temperature, and supply voltage. Calibration and alarm/warning threshold data are written and stored in the internal memory (EEPROM).

SFP transceiver module has done sampling test under most famous brands of routers, switches, servers.

The hot swappable GPON OLT Class D SFP transceiver is ideal for Internet Service Provider (ISP) Gigabit Passive Optical Network (GPON) communication links, other optical links.





  • Complies with SFP Multi-Source Agreement (MSA) SFF-8074i
  • Complies with ITU-T G.984.2 Amendment 1
  • Complies with FCC 47 CFR Part 15, Class B
  • Complies with FDA 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007
  • Complies with SFF-8472
  • Compatible with TR-NWT-000870 4.1 ESD sensitivity classification Class2.
  • Compatible with Telcordia GR-468-CORE



Optical transmitter Characteristics
Parameter Symbol Min Typical Max Unit Notes
Launched Power (avg.) POUT +6 +9 +10 dBm  
Operating Wavelength Range λC 1480   1500 nm  
Spectral Width (-20dB) ∆λ     1 nm  
Side Mode Suppression Ratio SMSR 30        
Extinction Ratio ER 8.2     dB PRBS 223-1+72CID @2.488Gbit/s
Transmitter and Dispersion Penalty TDP     1 dB Transmit on 20km SMF
Optical Output Power after TX Disable PDIS     -39 dBm  
Output Eye Diagram Compliant with ITU-T G.984.2
Transmitter Reflectance       -10 dB  
Optical Receiver Characteristics
Parameter Symbol Min Typical Max Unit Notes
Wavelength Range λC 1260   1360 nm  
Receiver Sensitivity SEN     -32 dBm Note1
Optical Power Input Overload SAT -15     dBm Note1
Dynamic Range   15     dB Figure 1
Receiver Reflectance       -15 dB  
Note 1: PRBS 223-1+72CID @1244Mbps, transmitter is operating, BER ≤1×10-10



Typical Application Circuit


9dBm GPON OLT SFP Class C+++ D  1.244Gbps SFP Transceiver Modules 0



EEPROM Memory Map

9dBm GPON OLT SFP Class C+++ D  1.244Gbps SFP Transceiver Modules 1



EEPROM Serial ID Memory Contents


The optical transceiver contains an EEPROM. It provides access to sophisticated identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information. When the serial protocol is activated, the host generates the serial clock signal (SCL, Mod Def 1). The positive edge clocks data into those segments of the EEPROM that are not writing protected within the SFP transceiver. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

The Module provides diagnostic information about the present operating conditions. The transceiver generates this diagnostic data by digitization of internal analog signals. Calibration and alarm/warning threshold data is written during device manufacture. Received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring all are implemented. The diagnostic data are raw A/D values and must be converted to real world units using calibration constants stored in EEPROM locations 56 - 95 at wire serial bus address A2h. The digital diagnostic memory map specific data fields define as following.

Contact Details

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