Description
The F-tone Networks SFP28 LWDM 20km Transceiver is a “Limiting module”, designed for CPRI option10,25GBASE, link length up to 20km on G.652 SMF, link budget can reach 13.5dB.They are compliant with SFF-8431 Rev 4.1, SFF-8432 and SFF-8472 Rev 12.3.The transmitter section incorporates a DML laser，and the receiver section consists of a PIN photodiode integrated with TIA.
Digital diagnostics functions are available via a 2-wire serial interface, as specified in SFF-8472, which allows real-time access to device operating parameters such as case temperature, laser bias current, transmitted optical power, and received optical power and module supply voltage.

Features
● Hot-pluggable SFP28 form factor
● Supports CPRI wireless data rate
● Cooled DML transmitter and PIN receiver
● Internal CDR circuits on both receiver and transmitter channels
● Maximum power dissipation：2W
● Maximum link length：20km on SMF
● Duplex LC connector
● Single 3.3V power supply
● RoHS compliant (lead free)
● Case operating temperature
     Commercial: 0 ~ +70℃
     Industrial: -40 ~ +85℃

Applications
● CPRI Option 10、eCPRI
● 25G Ethernet 
● Support 10G CPRI option 8 by CDR bypass

Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Supply Voltage	Vcc	-0.5	+3.8	V
Operating Case temperature	Top	-40	+85	ºC
Operating Relative Humidity	RHop	0	85	%
Storage and Transportation Temperature	Tst	-40	+85	ºC
Storage and Transportation Relative Humidity	-	0	85	%
Max Link Length	Lmax		20	km

Operating Conditions

Parameter	Symbol	Min	Typical	Max	Unit
Supply Voltage	Vcc	3.13	3.3	3.47	V
Supply current	Icc	-	450	-	mA
Operating Case temperature	Tca	-40	-	+85	ºC
Module Power Dissipation [1]	Pm	-	-	2	W
ESD(High speed pins) [2]	-	-	-	1000	V

Notes:
[1].Power consumption over -40~85℃ case temperature and BOL
[2].Human body model per JEDEC JESD22-A114-B,compliant with INF-077i Rev.4.5 August 31,2005

Transmitter Optical Specifications

Parameter	Symbol	Min	Typical	Max	Unit
Laser Safety	ClassⅠaccording to IEC60825
Optical Wavelength	λ	1269.23,1273.54,1277.89,1282.26, 1286.66,1291.10,1295.56,1300.05, 1304.58,1309.14,1313.73,1318.35			nm
Data rate	BR		25.78125	-	Gbps
Wavelength Deviation	Δλ	-2.5		+2.5	nm
Average Optical Power [1]	Pout	2	-	7	dBm
Optical Transmit Power (disabled)	Pout_off	-	-	-30	dBm
Spectral Width (-20dB)	Δλ20	-	-	1	nm
Side Mode Suppression Ratio [2]	SMSR	30	-	-	dB
Extinction Ratio	ER	4	-	-	dB

Notes:
[1].Average power measured at output over the operating temperature
[2].Ratio of the average output power in the dominant longitudinal mode to the power in the most significant side mode peak under full modulation condition
Laser Safety: All transceivers in this datasheet are ClassⅠLaser products per FDA/CDRH and IEC-60825 standards. They must be operated under specified operating conditions.

Receiver Optical Specifications

Parameter	Symbol	Min	Typical	Max	Unit	Note
Input Operating Wavelength	λ	1260	-	1620	nm
Data rate	BR		25.78125	-	Gbps
Maximum Input Power	RX-overload		-	-4	dBm
Rx Damage threshold				-3	dBm
Average Receive Power	Pavg			-4	dBm
Sensitivity(OMA)	Rsen1[1]	-	-	-20	dBm
Sensitivity(OMA)	Rsen2[2]			-20	dBm
Loss of Signal Asserted	LOSA	-31	-	-	dBm
LOS De-Asserted	LOSD	-	-	-21	dBm
LOS Hysteresis	LOSH	0.5	-		dB

Notes:
[1] Measured with PRBS 2^31-1,BER <5E^-5, 24.33Gbps.
[2] Measured with PRBS 2^31-1,BER <5E^-5, 25.78Gbps.

Transmitter Specifications – Electrical

Parameter	Symbol	Min	Typical	Max	Unit
Data Rate	BR		25.78125	-	Gbps
Input differential impedance	Rim	80	100	120	Ω
Differential data Input	VtxDIFF	-	-	900	mVpp
Transmit Disable Voltage	VD	2.0	-	Vcc+0.3	V
Transmit Enable Voltage	Ven	-0.3	-	+0.8	V
Transmit Disable Assert Time	t_off	-	-	100	us
Tx Enable Assert Time	t_on	-	-	2	ms
Tx_Fault Assert Time for cooled SFP28	Tx_f_on	-	-	50	ms
Tx_Fault Reset Time [1]	t_reset	10	-	-	us
Initialization Time for cooled SFP28	t_start_up	-	-	10	s

Notes:
[1] Time Tx_Disable must be held high to reset Tx_Fault

Receiver Specifications – Electrical

Parameter	Symbol	Min	Typical	Max	Unit
Data Rate	BR	-	25.78125	-	Gbps
Differential Output Impedance	Rout	80	100	120	Ω
Differential Output Swing	Vout P-P	-	-	900	mVpp
Rise/Fall Time	Tr / Tf	9.5	-	-	ps
Loss of Signal –Asserted	VOH	2	-	Vcc+0.3	V
Loss of Signal –Negated	VOL	0	-	+0.4	V
LOS Assert/Deassert Time Delay	T_los on/off	-	-	100/100	us

Mechanical Dimensions
F-tone Networks FTCS-Lxx25G-20Dxx SFP28 Transceivers are compatible with the SFF-8432 specification for improved pluggable form factor, and shown here for reference purposes only.

Ordering information

Part Number	Product Description
FTCS-Lxx25G-20D	25Gbps 20km LWDM SFP28,0~+70ºC
FTCS-Lxx25G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC
FTCS-L2625G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC, 1269.23nm, red
FTCS-L2725G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC, 1273.54nm, red
FTCS-L2825G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC, 1277.89nm, red
FTCS-L2825G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC, 1282.26nm, red
FTCS-L3025G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC, 1309.14nm, blue
FTCS-L3125G-20DI	25Gbps 20km LWDM SFP28,-40~+85ºC, 1313.73nm, blue

 

 

 

 

 

 

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Important Notice

Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by F-tone Networks before they become applicable to any particular order or contract. In accordance with the F-tone Networks 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 F-tone Networks or others. Further details are available from any F-tone Networks sales representative.