QSFP28 100G DR1

Accelight’s QSFP28 transceiver module is designed for use in 100 Gigabit Ethernet links over 500m single mode fiber. The module incorporates 1 channel optical signal, on 1311nm center wavelength, operating at 100Gbps data rate. This module can convert 4 channels of 25Gbps (NRZ) electrical input data to 1 channel of 100Gbps (PAM4) optical signal, and also can convert 1 channel of 100Gbps (PAM4) optical signal to 4 channels of 25Gbps (NRZ) electrical output data. The electrical interface of the module is compliant with the OIF CEI-28G-VSR and QSFP28 MSA.

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Product Details

Product Features

Supports 100Gbps

Single 3.3V Power Supply

IEEE802.3cd 100GBASE-DR Specification Compliant

Power dissipation < 4.5W

Up to 500m over SMF with FEC

RoHS compliant

QSFP28 MSA Compliant

4x25Gbps Electrical interface

LC Duplex connector

Commercial case temperature range of 0°C to 70°

I2C interface with integrated Digital Diagnostic Monitoring
Applications

100G Ethernet

Data center
Ordering information

Part No.
Data Rate
Fiber
Distance
Interface
Temp.
DDMI
CMIS
AQP100C01310S50
100Gbps
SMF
500m
LC
0~+70℃
Yes
CMIS4.0

Performance Specifications

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit
Storage Temperature	Ts	-40	85	°C
Supply Voltage	Vcc	-0.5	3.6	V
Damage threshold	Rxdmg	5.5		dBm

Recommended Operating Conditions

Parameter	Symbol	Min.	Typical	Max.	Unit
Operating case temperature	Tc	0		70	°C
Power supply voltage	Vcc	3.135	3.3	3.465	V
Operating relative humidity	RH	5		85	%
Power dissipation	PD			4.5	W
Electrical signal rate			25.78125		GBd
Optical signal rate			53.125		GBd
Power supply noise				66	mVpp
Receiver differential data output load			100		Ohm

Figure 1: Transceiver Block Diagram

Figure 2: Application Reference Diagram

Transmitter

As shown in Figure 1, the transmitter path of the transceiver contains a 4x25Gbps CAUI-4 electrical input, integrated electrical multiplexer, EML driver, EML Laser and diagnostic monitor. The integrated electrical multiplexer converts 4 channels of 25Gbps (NRZ) electrical input data to 1 channel of 100Gbps (PAM4) optical signal.

Receiver

As shown in Figure 1, the receiver path of the transceiver contains a PIN photodiode, trans-impedance amplifier (TIA), integrated de-multiplexer and 4x25Gbps CAUI-4 compliant electrical output block. The integrated demultiplexer converts 1 channel of 100Gbps (PAM4) optical signal to 4 channels of 25Gbps (NRZ) electrical output data.

High Speed Electrical Signal Interface

The interface between QSFP28 module and Host ASIC is shown in Figure 2. The high speed signal lines are internally AC-coupled and the electrical inputs are internally terminated to 100 Ohms differential. All transmitter and receiver electrical channels are compliant to CAUI-4 specification per IEEE 802.3cd.

Control Signal Interface

The module has the following low speed signals for control and status: ModSelL, ResetL, LPMode/TxDis, ModPrsL, IntL/RxLOSL. In addition, there is an industry standard two wire serial interface scaled for 3.3V LVTTL. The definition of control signal interface and the registers of the serial interface memory are further defined in the Control Interface& Memory Map section.

Handling and Cleaning

Exposure to current surges and overvoltage events can cause immediate damage to the transceiver module. Observe the precautions for normal operation of electrostatic discharge sensitive equipment, and attention should also be taken to restrict exposure to the conditions defined in the absolute maximum ratings.

Optical connectors will be exposed as long as the port plug is not inserted, so always pay attention to protection. Each module is equipped with a port guard plug to protect the optical ports. The protective plug shall always be in place whenever the optical fiber is not inserted. Before inserting the optical fiber, it is recommended to clean the end of the optical fiber connector to avoid contamination of the module optical port due to dirty connector. If contamination occurs, use standard LC port cleaning methods.

General Electrical Characteristics

Parameter	Symbol	Min.	Typical	Max.	Unit
Transceiver Power Consumption				4.5	W
Transceiver Power Supply Total Current				1298.7	mA
AC Coupling Internal Capacitor			0.1		μF

Reference Points

Test Point

Description

TP0

Host ASIC transmitter output at ASIC package contact.

TP1

Input to module compliance board through mated module compliance board and

module connector. Used to test module input.

TP1a

Host ASIC transmitter output through the host board and host card edge connector at the output of the host compliance board. Also used to calibrate module input

compliance signals.

TP4

Module output through the compliance board connectors at the output of the

module compliance board. Also used to calibrate host input compliance signals.

TP4a

Input to host compliance board. Used to test host input.

TP5

Input to host ASIC.

TP5a

Far end module output through a reference channel.

Figure 5: IEEE 802.3 CAUI-4 compliance points TP1, TP4

High Speed Electrical Input Characteristics

Parameter	Test Point	Min.	Typical	Max.	Unit	Conditions
Differential peak-peak input voltage tolerance	TP1a	900			mVp-p
Differential input impedance	TP1	90	100	110	Ohm
Output rise/fall time	TP1a	10			ps	20%~80%
Eye width	TP1a	0.46			UI	1E-15
Eye height , differential	TP1a	95			mV	1E-15
DC common mode voltage (Vcm)	TP1	-350		2850	mV

High Speed Electrical Output Characteristics

ParamPareter	Test Point	Min.	Typical	Max.	Unit	Conditions
Differential peak-peak output voltage	TP4			900	mVp- p
Differential output impedance	TP4	90	100	110	Ohm
Output rise/fall time	TP4	12			ps	20%~80%
Eye width	TP4	0.57			UI	1E-15
Eye height differential	TP4	228			mV	1E-15
DC common mode voltage (Vcm)	TP4	-350		2850	mV

Optical Characteristics

High Speed Optical Transmitter Characteristics

Parameter	Symbol	Min.	Typical	Max.	Unit
Signaling speed			53.125		Gbaud
Modulation format			PAM4
Center wavelength	λc	1304.5	1311	1317.5	nm
Side-mode suppression ratio	SMSR	30			dB
Extinction ratio	ER	3.5			dB
Transmit OMA	TxOMA	-0.8		4.2	dBm
Transmit average	TxAVG	-2.9		4	dBm
Launch power in OMAouter minus TDECQ		-2.2			dBm
Launch power in OMAouter minus TDECQ		-1.9			dBm
Transmitter and dispersion eye closure	TDECQ			3.4	dB
Optical return loss tolerance				15.5	dB

High Speed Optical Receiver Characteristics

Parameter	Symbol	Min.	Typical	Max.	Unit
Signaling speed			53.125		Gbaud
Center wavelength	λc	1304.5	1311	1317.5	nm
Damage threshold	Rxdmg	5			dBm
Receive power (OMAouter)	RxOMA			4.2	dBm
Average receive power	RxAVG	-5.9		4	dBm
Receiver sensitivity (OMAouter)	SenOMA			Max (-3.9, SECQ-5.3)	dBm
Receiver reflectance				-26	dB
LOS Assert	LOSA	-15			dBm
LOS De-Assert	LOSD			-12	dBm
LOS hysteresis		0.5			dB

QSFP28 Transceiver Electrical Pad Layout

Pin Descriptions

Pin	Logic	Symbol	Description	Plug Sequence	Notes
1		GND	Ground	1	1
2	CML-I	Tx2n	Transmitter Inverted Data Input	3
3	CML-I	Tx2p	Transmitter Non-Inverted Data Input	3
4		GND	Ground	1	1
5	CML-I	Tx4n	Transmitter Inverted Data Input	3
6	CML-I	Tx4p	Transmitter Non-Inverted Data Input	3
7		GND	Ground	1	1
8	LVTTL-I	ModSelL	Module Select	3
9	LVTTL-I	ResetL	Module Reset	3
10		VccRx	+3.3V Power Supply Receiver	2	2
11	LVCMOS- I/O	SCL	Two-wire serial interface clock	3
12	LVCMOS- I/O	SDA	Two-wire serial interface data	3
13		GND	Ground	1	1
14	CML-O	Rx3p	Receiver Non-Inverted Data Output	3
15	CML-O	Rx3n	Receiver Inverted Data Output	3
16		GND	Ground	1	1
17	CML-O	Rx1p	Receiver Non-Inverted Data Output	3
18	CML-O	Rx1n	Receiver Inverted Data Output	3
19		GND	Ground	1	1
20		GND	Ground	1	1
21	CML-O	Rx2n	Receiver Inverted Data Output	3
22	CML-O	Rx2p	Receiver Non-Inverted Data Output	3
23		GND	Ground	1	1
24	CML-O	Rx4n	Receiver Inverted Data Output	3
25	CML-O	Rx4p	eceiver Non-Inverted Data Output	3
26		GND	Ground	1	1
27	LVTTL-O	ModPrsL	Module Present	3
28	LVTTL-O	IntL/ RxLOSL	Interrupt. Optionally configurable as RxLOSL via the management interface (SFF-8636).	3

29		VccTx	+3.3V Power supply transmitter	2	2
30		Vcc1	+3.3V Power supply	2	2
31	LVTTL-I	LPMode/ TxDis	Low Power Mode. Optionally configurable as TxDis via the management interface (SFF-8636).	3
32		GND	Ground	1	1
33	CML-I	Tx3p	Transmitter Non-Inverted Data input	3
34	CML-I	Tx3n	Transmitter Inverted Data Input	3
35		GND	Ground	1	1
36	CML-I	Tx1p	Transmitter Non-Inverted Data Input	3
37	CML-I	Tx1n	Transmitter Inverted Data Input	3
38		GND	Ground	1	1
34	CML-I	Tx3n	Transmitter Inverted Data Input	3
35		GND	Ground	1	1
36	CML-I	Tx1p	Transmitter Non-Inverted Data Input	3
1: GND is the symbol for signal and supply (power) common for the module. All are common within the module and all module voltages are referenced to this potential unless otherwise noted. Connect them directly to the host board signal-common ground plane.
2: VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and applied concurrently. VccRx, Vcc1 and VccTx are internally connected within the module in any combination. Vcc contacts in SFF- 8662 and SFF-8672 each have a steady state current rating of 1A.

Figure 7: Host Board Power Supply Filter

Mechanical Specifications

Part No.	Data Rate	Fiber	Distance	Interface	Temp.	DDMI	CMIS
AQP100C01310S50	100Gbps	SMF	500m	LC	0~+70℃	Yes	CMIS4.0