SFP28 25G BIDI 10km - 40G/25G/10G - Accelight Technologies, Inc.

SFP28 25G BIDI 10km

Accelight’s SFP28 BiDi series optical transceiver is designed for fiber communications support 24.33Gbps and 25.78Gbps with CDR engaged, while, 10G Ethernet optical data communication can be supported when CDR is bypassed. It is with the SFP+ 20-pin connector to allow hot plug capability. The transmitter section uses a multiple quantum well DFB, which is class 1 laser compliant according to International Safety Standard IEC-60825. The receiver section uses an integrated InGaAs detector preamplifier (IDP) mounted in an optical header and a limiting post-amplifier IC.

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Product Details

Product Features

Supports data rate 24.33 and 25.78G with CDR engaged mode

Supports data rate 9.95 and 10.31G with CDR bypassed mode

Two type: 1277nm DFB Transmitter/1330nm Receiver

1330nm DFB Transmitter.1277nm Receiver

Up to 10km over SMF

Single 3.3V power supply

Power dissipation < 1.5w

LC connector interface

Compliant with specification SFF-8402

Operation case temperature: -40℃~ +85 ℃

RoHS Compliant
Applications

CPRI option 10

25GbE

10GbE Optical link
Ordering information

Part No.
Data Rate
Laser
Distance
Interface
Latch color
ASP025CB2733010
25G
1270nm DFB
10km
LC
Gray
ASP025CB3327010
25G
1330nm DFB
10km
LC
Green

Performance Specification

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit
Storage Temperature	Ts	-40	85	°C
Supply Voltage	Vcc	-0.5	3.6	V
Operating Relative Humidity	RH	5	95	%

Recommended Operating Conditions

Parameter	Symbol	Min.	Typical	Max.	Unit
Operating Case Temperature	Tc	-40		+85	°C
Power Supply Voltage	Vcc	3.14	3.3	3.46	V
Power Supply Current	Icc			455	mA

Performance Specification -Electrical

Parameter	Symbol	Min.	Typical	Max.	Unit
Transmitter
CML inputs(Differential)	Vin			900	mVpp
Input Impedance(Differential)	Zin		100		ohms
Tx_Disable input voltage _Low		-0.3		0.8	V
Receiver
CML output(Differential)	Vout	300		1000	mVpp
Rx_Disable output voltage_Low		-0.3		0.4	V

Optical and Electrical Characteristics

1270nm DFB/ 1330nm Receiver:

Parameter	Symbol	Min.	Typ.	Max.	Unit
9um Core Diameter SMF				10	km
Data Rate				25.78	Gbps
Transmitter
Optical Center Wavelength	λ	1260	1270	1280	nm
Spectral Width (-20dB)	Δλ			1	nm
Average Output Power@25.78Gb/s	PAVG	-7		+2	dBm
Output Power(OMA)	POMA	-4		2.2	dBm
OMA minus TDP		-5			dBm
Extinction Ratio	ER	3			dB
Transmitter Dispersion Penalty	TDP			2.7	dB
Transmitter Reflectance				-26	dB
Side Mode Suppression Ratio	SMSR	30			dB
Average Launch Power of OFF Transmitter	POFF			-30	dBm
Receiver
Center Wavelength	λC	1320		1340	nm
Average Receive Power	Pmin	-13.3			dBm
Stressed Receiver Sensitivity(OMA)	SenSRS			-9.5	dBm
OMA Receiver Sensitivity*Note5	SenOMA			-12	dBm
Receiver Reflectance	RL			-26	dB
Receiver Overload	Pmax	2			dBm
LOS De-Assert	LOSD			-14	dBm
LOS Assert	LOSA	-30			dBm
LOS Hysteresis	HY	0.5			dB

1330nm DFB/1270nm Receiver:

Parameter	Symbol	Min.	Typ.	Max.	Unit
9um Core Diameter SMF				10	km
Data Rate				25.78	Gbps
Transmitter
Optical Center Wavelength	λ	1320	1330	1340	nm
Spectral Width (-20dB)	Δλ			1	nm
Average Output Power@25.78Gb/s	PAVG	-7		+2	dBm
Output Power(OMA)	POMA	-4		2.2	dBm
OMA minus TDP		-5			dBm
Extinction Ratio	ER	3			dB
Transmitter Dispersion Penalty	TDP			2.7	dB
Transmitter Reflectance				-26	dB
Side Mode Suppression Ratio	SMSR	30			dB
Average Launch Power of OFF Transmitter	POFF			-30	dBm
Receiver
Center Wavelength	λC	1260		1280	nm
Average Receive Power	Pmin	-13.3			dBm
Stressed Receiver Sensitivity(OMA)	SenSRS			-9.5	dBm
OMA Receiver Sensitivity*Note5	SenOMA			-12	dBm
Receiver Reflectance	RL			-26	dB
Receiver Overload	Pmax	2			dBm
LOS De-Assert	LOSD			-14	dBm
LOS Assert	LOSA	-30			dBm
LOS Hysteresis	HY	0.5			dB

SFP28 Transceiver Electrical Pad Layout

Pin Arrangement and Definition

Pin	Name	Function	Plug Seq	Notes
1	VeeT	Transmitter Ground	1	Note 5)
2	TX Fault	Transmitter Fault Indication	3	Note 1)
3	TX Disable	Transmitter Disable	3	Note 2), Module disables on high or open
4	SDA	Module Definition 2	3	Data line for Serial ID.
5	SCL	Module Definition 1	3	Clock line for Serial ID.
6	MOD-ABS	Module Definition 0	3	Note 3)
7	RS0	RX Rate Select (LVTTL).	3	Rate Select 0, optionally controls SFP28 module receiver. This pin is pulled low to VeeT with a >30K resistor.
8	RX LOS	Loss of Signal	3	Note 4)
9	RS1	TX Rate Select (LVTTL).	1	Rate Select 1, optionally controls SFP28 module transmitter. This pin is pulled low to VeeT with a >30K resistor.
10	VeeR	Receiver Ground	1	Note 5)
11	VeeR	Receiver Ground	1	Note 5)
12	RD	Inv. Received Data Out	3	Note 6)
13	RD+	Received Data Out	3	Note 6)
14	VeeR	Receiver Ground	1	Note 5)
15	VccR	Receiver Power	2	3.3V ± 5%, Note 7)
16	VccT	Transmitter Power	2	3.3V ± 5%, Note 7)
17	VeeT	Transmitter Ground	1	Note 5)
18	TD+	Transmit Data In	3	Note 8)
19	TD-	Inv. Transmit Data In	3	Note 8)
20	VeeT	Transmitter Ground	1	Note 5)

Notes:

Note 1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor on the host board. Pull up voltage between 2.4V and VccT/R+0.3V. When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.4V.

Note 2) 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~10 K Ω resistor. Its states are:

Low (-0.3 – 0.8V): Transmitter on (>0.8, < 2.0V): Undefined

High (2.0 – VccT/R+0.3V): Transmitter Disabled Open: Transmitter Disabled

Note 3) Module Absent, connected to VeeT or VeeR in the module.

Note 4) RX LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor. Pull up voltage between 2.4V and VccT/R+0.3V. When high, this output indicates the received optical power is below the worst- case receiver sensitivity (as defined by the standard in use). Low indicates normal operation. In the low state, the output will be pulled to < 0.4V.

Note 5) VeeR and VeeT may be internally connected within the SFP28 module.

Note 6) RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which should be

terminated with 100Ω (differential) at the user SERDES. The AC coupling is done inside the module and is thus not required on the host board. The voltage swing on these lines will be between 150mV and 500mV single-ended when properly terminated.

Note 7) VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5% at the SFP+ connector pin. Maximum supply current is 455mA. Inductors with DC resistance of less than 1 ohm should be used in order to maintain the required voltage at the SFP28 input pin with 3.3V supply voltage. When the recommended supply-filtering network is used, hot plugging of the SFP28 transceiver module will result in an inrush current of no more than 30mA greater than

the steady state value. VccR and VccT may be internally connected within the SFP28 transceiver module.

Note 8) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω differential termination inside the module. The AC coupling is done inside the module and is thus not required on the host board. The inputs will accept swings less than 450mV single-ended, though it is recommended that values between 90mV-900mV in differential be used for best EMI performance

Mechanical Specification

Part No.	Data Rate	Laser	Distance	Interface	Latch color
ASP025CB2733010	25G	1270nm DFB	10km	LC	Gray
ASP025CB3327010	25G	1330nm DFB	10km	LC	Green