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25G SFP28 40km，25G SFP28 40km，SFP28 25G 40km

25Gbps SFP28 LAN-WDM Transceiver, DML&APD Transceiver, DML&APD Single Mode, 40km Reach

Product Features

Supports up to 25.78Gbps bit rates
Hot-pluggable SFP+ footprint
Up to 40km for SMF transmission
Compliant with SFP+ MSA and SFF-8472 with duplex LC receptacle
Compatible with RoHS
Single +3.3V power supply2
Real Time Digital Diagnostic Monitoring
Operating case temperature:
Standard: 0 to +70°C

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Product Detail

25Gbps SFP28 LAN-WDM Transceiver, DML&APD Single Mode, 40km Reach

RSPD-25GDL40-XXX

Applications

25GBASE-ER

Description

The SFP28 transceivers are high performance, cost effective modules supporting data rate of 25.78Gbps and 40km transmission distance with SMF.

The transceiver consists of three sections: a cooled DML laser transmitter, a APD photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.

The transceivers are compatible with SFP Multi-Source Agreement and SFF-8472 digital diagnostics functions.

25G SFP28 40km

Transceiver functional diagram

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit
Storage Temperature	Ts	-40	-	85	℃
Relative Humidity	RH	5	-	95	%
Power Supply Voltage	VCC	-0.3	-	4	V
Signal Input Voltage	VSI	Vcc-0.3	-	Vcc+0.3	V

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0		70	℃
Power Supply Voltage	VCC	3.14	3.3	3.47	V
Power Supply Current	ICC			600	mA
Data Rate	BR		25.78		Gbps	TX Rate/RX Rate
Transmission Distance	TD		40		Km
Coupled fiber	Single mode fiber					9/125um SMF

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Lane Wavelengths(Range)		1272.55 to 1274.54 1276.89 to 1278.89 1281.25 to 1283.27 1285.65 to 1287.69 1290.07 to 1292.12 1294.53 to 1296.59 1299.02 to 1301.09 1303.54 to 1305.63 1308.09 to 1310.19			nm
Average Launched Power	PO	0	-	+6.0	dBm
Average Launched Power(Laser Off)	Poff	-	-	-30	dBm
Spectrum Bandwidth(-20dB)	Dl	-	-	1	nm
Side-Mode Suppression Ratio	SMSR	30	-	-	dB
Transmitter and Dispersion Penalty	TDP	-	-	1	dB
Extinction Ratio	ER	3.5	-	-	dB
Output Eye Mask	Compliant with IEEE 802.3cc					Note (2)
Receiver
Input Optical Wavelength	λIN	1272.55		1310.19	nm
Receiver Sensitivity-AVG	PSens			-19	dBm	Note (1)
Receiver Sensitivity-OMA	PSens-OMA			-18.2	dBm	Note (1)
Input Saturation Power (Overload)	PSAT	-4			dBm	Note (1)
Receiver Reflectance				-26	dB
Los Of Signal Assert	PA	-30			dBm
Los Of Signal De-assert	PD			-20	dBm
LOS -Hysteresis	PHys	0.5			dB

Note:

Note (1): BER≤5x10^-5

Electrical Interface Characteristics

High Speed Electrical Interface Characteristics

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Transmitter
Differential input swing	Vin(pp)	190		700	mV
Differential input return loss (min)	RLd(f)	9.5–0.37f, 0.01≤f<8 4.75–7.4log10(f/14), 8 ≤f<19			dB
Differential to common mode input return loss (min)	RLdc(f)	22-20(f/25.78), 0.01≤f<12.89 15-6(f/25.78), 12.89≤f<19			dB
Differential termination mismatch	Tm			10	%
Eye width	Ew			0.46	UI
Applied pk-pk sinusoidal jitter	Ppj	Per IEEE 802.3bm
Eye height	Eh		95		mV
DC common mode voltage	DCv	-350		2850	mV
Receiver
Differential data output swing	Vout（pp）	300	-	850	mV	-
Eye width	Ew	0.57	-	-	UI	-
Vertical eye closure	Vec	-	-	5.5	dB	-
Differential output return loss (min)	RLd(f)	9.5–0.37f, 0.01≤f<8 4.75–7.4log10(f/14), 8 ≤f<19			dB	-
Common to differential mode conversion return loss (min)	RLdc(f)	22-20(f/25.78), 0.01≤f<12.89 15-6(f/25.78), 12.89≤f<19			dB	-
Differential termination mismatch	Tm	-	-	10	%	-
Transition time, 20% to 80%	Tr/Tf	12	-	-	ps	20%~80%

LOW Speed Electrical Interface Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit
Transmitter
Transmitter Fault Output-High	VFaultH	2	-	Vcc+0.3	V
Transmitter Fault Output-Low	VFaultL	0	-	0.8	V
Transmitter Disable Voltage- High	VDisH	2	-	Vcc+0.3	V
Transmitter Disable Voltage- low	VDisL	0	-	0.8	V
Receiver
LOS Output Voltage-High	VLOSH	2	-	Vcc+0.3	V
LOS Output Voltage-Low	VLOSL	0	-	0.8	V

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			400	µs
Serial ID Clock Rate	f_serial_clock		100	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	℃	±3°C	Internal
Voltage	3.0 to 3.6	V	±3%	Internal
Bias Current	0 to 100	mA	±10%	Internal
TX Power	0 to 6	dBm	±3dB	Internal
RX Power	-19 to -4	dBm	±3dB	Internal

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.

25G SFP28 40km

Pin Descriptions

25Gbps SFP28 LAN-WDM Transceiver

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	SDA	SDA Serial Data Signal	3
5	SCL	SCL Serial Clock Signal	3
6	MOD_ABS	Module Absent. Grounded within the module	3
7	RS0	Not Connected	3
8	LOS	Loss of Signal	3	Note 3
9	RS1	Not Connected	3
10	VEER	Receiver ground	1
11	VEER	Receiver ground	1
12	RD-	Inv. Received Data Out	3	Note 4
13	RD+	Received Data Out	3	Note 4
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 5
19	TD-	Inv. Transmit Data In	3	Note 5
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) Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.

3) LOS is open collector output. Should be pulled up with 4.7k~10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

4) 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.

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

Recommended Interface Circuit

25Gbps SFP28 LAN-WDM Transceiver

Mechanical Dimensions

25g transceiver

Ordering information

Part Number	Product Description
RSPD-25GD40L-273	SFP28 1273.54nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-277	SFP28 1277.89nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-282	SFP28 1282.26nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-286	SFP28 1286.67nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-291	SFP28 1291.10nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-295	SFP28 1295.56nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-300	SFP28 1300.05nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-304	SFP28 1304.58nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM
RSPD-25GDL40-309	SFP28 1309.14nm LAN-WDM, 25.78Gbps, LC, 40km, 0°C~+70°C, with DDM

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Address : Room 901, Building 6, JD Smart Industrial Park, No. 128, Juhua Stone Avenue, Huashan Town, Huadu District, Guangzhou City
Tel : +86 15989256178
Whatsapp : +86 15914235380
Email : sales@fiberwdm.com

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Optical Transceivers

25G Optical Transceiver

25Gbps SFP28 LAN-WDM Transceiver, DML&APD Transceiver, DML&APD Single Mode, 40km Reach