1.25Gbps 120km SFP Optical Transceiver - Fiber Optic Cabling Management

1.25Gbps 40km SFP Optical Transceiver,DDM

2020-12-31

The SFP transceivers are high performance, cost-effective modules supporting dual data-rate of 1.25Gbps and 120km transmission distance with SMF. The transceiver consists of three sections: a DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA), and an MCU control unit. All modules satisfy class I laser safety requirements. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.

Features

Dual data-rate of 1.25Gbps operation
1550nm DFB laser and PIN photodetector for 120km transmission
Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
Digital Diagnostic Monitoring:
Internal Calibration or External Calibration
Compatible with RoHS
Compatible with CE
+3.3V single power supply
Operating case temperature:
- Standard: 0 to +70°C
- Industrial: -40 to +85°C

Applications

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

Module Block Diagram

Absolute Maximum Rating

Parameters	Symbol	Min.	Max.	Unit
Power Supply Voltage	VCC	-0.5	+4.0	V
Storage Temperature	Tc	-40	+85	C
Relative Humidity	RH	5	85	%

Recommended Operating Environment

Parameter		Symbol	Min	Typical	Max	Unit
Operating Case Temperature	Standard	Tc	0		+70	°C
Operating Case Temperature	Industrial	Tc	-40		+85	°C
Power Supply Voltage		Vcc	3.13	3.3	3.47	V
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	1480	1550	1580	nm
Spectral Width (RMS)		σ			1	nm
Side Mode Suppression Ratio		SMSR	30			dB
Average Output Power		Pout	0		5	dBm	1
Extinction Ratio		ER	9			dB
Optical Rise/Fall Time (20%~80%)		tr/tf			0.26	ns
Data Input Swing Differential		VIN	400		1800	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
Centre Wavelength		λc	1260		1580	nm
Receiver Sensitivity					-30	dBm	3
Receiver Overload			-9			dBm	3
LOS De-Assert		LOSD			-32	dBm
LOS Assert		LOSA	-35			dBm
LOS Hysteresis			0.5		4.5	dB
Data Output Swing Differential		Vout	400		1800	mV	4
LOS		High	2.0		Vcc	V
LOS		Low			0.8	V

Notes:

The optical power is launched into SMF.
PECL input, internally AC-coupled and terminated.
Measured with a PRBS 2⁷-1 test pattern @1250Mbps, BER ≤1×10^-12.
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_clock			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
Temperature	-20 to +85	°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 +5	dBm	±3dB	Internal / External
RX Power	-30 to -9	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 Definition

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.

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.
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. Its 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

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 the two-wire serial interface for serial ID

Mod-Def 2 is the data line of the two-wire serial interface for serial ID

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.
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.
TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

Regulatory Compliance

LinkWell SFP transceiver is designed to be Class I Laser safety compliant and is certified per the following standards:

Feature	Agency	Standard
Laser Safety	FDA	CDRH 21 CFR 1040 and Laser Notice No. 50
Product Safety	UL	UL and CUL EN60950-2: 2007
Environmental protection	SGS	RoHS Directive 2002/95/EC
EMC	CCIC	EN 55022: 2006+A1: 2007 EN 55024: 1998+A1+A2: 2003

Ordering Information

Part Number	Product Description
LW-SFP-1512-120D	SFP, 1550nm, 1.25Gbps, 120km, 0ºC ~ +70ºC, With Digital Diagnostic Monitoring
LW-SFP -1512-120DI	SFP, 1550nm, 1.25Gbps, 120km, -40ºC ~ +85ºC, With Digital Diagnostic Monitoring

References

Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September 2000.
Telcordia GR-253-CORE and ITU-T G.957 Specifications.

Important Notice

Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by LinkWell before they become applicable to any particular order or contract. In accordance with the LinkWell policy of continuous improvement specifications may change without notice.

The publication of information in this data sheet does not imply freedom from patent or other protective rights of LinkWell or others. Further details are available from any LinkWell sales representative.