1.25G 1310/1490nm GEPON Transceiver

SPEU-P3411-SE2DA

GEPON SFP ONU Transceiver

Features
Single Fiber Transceiver with single mode SC receptacle
1310nm burst-mode 1.25G/s transmitter with FP laser
1490nm continuous-mode 1.25G/s receiver with PIN-TIA
Complies with IEEE Stud 802.3ah™ -2004 1000BASE-PX20
Digital diagnostic interface compliant with SFF-8472 Rev 9.4, Digital Diagnostic Monitoring (DDM) with external calibration
3.3VSinglepowersupply
LVPECLinterfacelogiclevelfordatainput
CMLinterfacelogiclevelfordataoutput
Differentiallineinput/outputimpedance100ohm
LVTTLforburstsignalinputandsignaldetectoutput
Complies with RoHS
Operating case temperature:
Standard: 0 to +70°C

Applications
Gigabit Ethernet Passive Optical Network (GEPON) ONU

Description
The SPEU-P3411-SE2DA EPON SFP ONU Bi-Directional Transceiver is the high performance module for single fiber communications by using 1310nm 1.25Gbps burst mode transmitter and 1490nm 1.25Gbps continuous receiver. It is Optical Network Unit (ONU) for IEEE Stud 802.3ah™ -2004 1000BASE-PX20. The optical transceiver is compliant with the Small Form- Factor Pluggable (SFP) Multi-Source Agreement (MSA).
The transmitter section uses a 1310nm FP laser diode with automatic power control (APC) function and temperature compensation circuitry to ensure stable extinction ratio overall operating temperature range, and full IEC825 and CDRH class 1 eye safety. The receiver has a hermetically packaged PIN-TIA (trans-impedance amplifier) pre-amplifier and a limiting amplifier with CML compatible differential outputs.

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Units	Notes
Storage Temperature	Tst	-40	+85	°C	-
Operating Case Temperature	Tc	0	70	°C	-
Operating Humidity	RH	5	90	%	Non-condensing
Input Voltage	-	GND	Vcc	V	-
Power Supply Voltage	Vcc-Vee	0	3.6	V	-

Recommended Operating Conditions

Parameter		Symbol	Min	Typical	Max	Unit
Operating Case Temperature	Standard	Tc	0	-	+70	°C
Power Supply Voltage		Vcc	3.13	3.3	3.47	V
Power Supply Current		Icc	-	-	400	mA

Optical and Electrical Characteristics

Parameter		Symbol	Min	Typical	Max	Unit	Notes
Transmitter
Data Rate				1.25		Gb/S
Centre Wavelength		λc	1260	1310	1360	nm
Spectral Width		∆λ			3	nm
Side Mode Suppression Ratio		SMSR	30			dB
Average Output Power		Pout	0		4	dBm	1
Extinction Ratio		ER	9			dB
Burst Enable Delay		Ton			32	ns	Fig.1
Burst Disable Delay		Toff			32	ns	Fig.1
Average Launch Power-OFF Transmitter		Poff			-41	dBm
Optical Eye Diagram		Compliant with of IEEE802.3ah (Fig.60-6) transmitter eye mask definition
Optical Rise/Fall Time(20%~80%)		tr/tf			260	ps
Data Input Swing Differential		VIN	200		1600	mV	2
Input Differential Impedance		ZIN	90	100	110	Ω
TX Disable	Disable		2.0		Vcc	V
TX Disable	Enable		0		0.8	V
TX Fault	Fault		2.0		Vcc	V
TX Fault	Normal		0		0.8	V
Receiver
Data Rate				1.25		Gb/S
Centre Wavelength		λc	1480		1500	nm
Receiver Sensitivity		Sen			-26	dBm	3
Receiver Overload		Sat	-3			dBm	3
Receiver Reflectance					-12	dB
Signal Detect De-Assert		SDD	-44			dBm
Signal DetectAssert		SDA			-27	dBm
Signal Detect Hysteresis		SDH	0.5		6	dB
Output Differential Impedance		ZIN	90	100	110	Ω
Data Output Swing Differential		Vout	400		1000	mV
SD Output Voltage	High		2.0		Vcc	V
SD Output Voltage	Low		0		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 ≤1×10-10.

Diagnostics

Parameter	Range	Unit	Accuracy	Calibration
Temperature	0 to +70	°C	±3°C	Internal/External
Voltage	3.0 to 3.6	V	±3%	Internal/External
Bias Current	0 to 100	mA	±10%	Internal/External
TX Power	0 to 4	dBm	±3dB	Internal/External
RX Power	-26 to -3	dBm	±3dB	Internal/External

GEPON ONU tranceiver

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.
GEPON ONU SFP transceiver

PinDefinitions

Pin Definitions

Pin	Signal Name	Description	PlugSeq.	Notes
1	VEET	Transmitter Ground	1
2	TXFAULT	Transmitter Fault Indication	3	Note1
3	Brust	Burst Single	3	Note2
4	MOD_DEF(2)	SDA Serial Data Signal	3	Note3
5	MOD_DEF(1)	SCL Serial Clock Signal	3	Note3
6	MOD_DEF(0)	TTL Low	3	Note3
7	-	-	3
8	SD	Signal Detect Output	3	Note4
9	-	-	3
10	VEER	Receiver Ground	1
11	VEER	Receiver Ground	1
12	RD-	Inv. Received Data CML Output, Internal AC Coupling	3	Note5
13	RD+	Received Data CML Output, Internal AC Coupling	3	Note5
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	Note6
19	TD-	Inv. Transmit Data In	3	Note6
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) BURST is a TTL input. When it is low, LD is on; when it is high, LD is off.
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) SD 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 0 indicates loss of signal; Logic 1 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.
5) 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.
6) TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.
　

Recommended Interface Circuit

GEPON ONU SFP