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SFP-25GBE-SR 100m-850mm-25G Transceiver

SFP-25GBE-SR 100m-850mm-25G Transceiver

Product Features

Supports up to 25.78Gbps bit rates
Hot-pluggable SFP+ footprint
850nm VCSELlaser and PIN photodiode
Up to 70m for OM3-MMF and 100m for OM4-MMF transmission
Compliant with SFP+ MSA and SFF-8472 with duplex LC receptacle
Compatible with RoHS
Single +3.3V power supply
Real Time Digital Diagnostic Monitoring
Operating case temperature:

Standard: 0 to +70°C

Applications

78Gb/s single lane 100GE SR4

Description

The SFP28 transceivers are high performance, cost effective modules supporting data rate of 25.78Gbps and 70m transmission distance with OM3 MMF or 100m transmission distance with OM4 MMF.

The transceiver consists of three sections: a VCSEL laser transmitter, a PIN 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.

Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Supply Voltage	Vcc	-0.5	4.5	V
Storage Temperature	Ts	-40	+85	°C
Operating Humidity	-	5	85	%

Recommended Operating Conditions

Parameter	Symbol	Min	Typical	Max	Unit
Operating Case Temperature	Tc	0		+70	°C
Power Supply Voltage	Vcc	3.135	3.30	3.465	V
Power Supply Current	Icc			300	mA
Data Rate			25.78		Gbps

Optical and Electrical Characteristics

Parameter		Symbol		Min	Typical	Max	Unit	Notes
Transmitter
Centre Wavelength			λc	840	850	860	nm
Spectral Width（RMS）			Δλ			0.6	nm
Side-Mode Suppression Ratio			SMSR	-	-	-	dB
Average Output Power			P_out	-8.4		2.4	dBm	1
Extinction Ratio			ER	2.0			dB
Data Input Swing Differential			V_IN	180		950	mV	2
Input Differential Impedance			Z_IN	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	840	850	860	nm
Receiver Sensitivity						-10	dBm	3
Receiver Overload				2.4			dBm	3
LOS De-Assert			LOS_D			-13	dBm
LOS Assert			LOS_A	-30			dBm
LOS Hysteresis				0.5		4	dB
Data Output Swing Differential			V_out	500	700	900	mV	4
LOS			High	2.0		Vcc	V
LOS			Low			0.8	V

Notes:

The optical power is launched into MMF.
PECL input, internally AC-coupled and terminated.
Measured with a PRBS 2³¹-1 test pattern @25.78Gbps, BER ≤5E-5..
Internally AC-coupled.

Timing and Electrical

Parameter	Symbol	Min	Typical	Max	Unit
Tx Disable Negate Time	t_on			2	ms
Tx Disable Assert Time	t_off			100	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		100	400	KHz
MOD_DEF (0:2)-High	V_H	2		Vcc	V
MOD_DEF (0:2)-Low	V_L			0.8	V

Diagnostics

Parameter	Range	Unit	Accuracy	Calibration
Temperature	0 to +70	°C	±3°C	Internal
Voltage	3.0 to 3.6	V	±3%	Internal
Bias Current	0 to 20	mA	±10%	Internal
TX Power	-8.0 to 3	dBm	±3dB	Internal
RX Power	-14 to 0	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.