Ascent Communication Technology

400G QSFP-DD LR4 CWDM 10 km

Ascent’s QSFP-DD-LR4-10 is a 400Gb/s Quad Small Form Factor Pluggable-double density (QSFP-DD) optical module designed for 10km optical communication applications. The module converts 8 channels of 50Gb/s (PAM4) electrical input data to 4 channels of CWDM optical signals, and multiplexes them into a single channel for 400Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 400Gb/s optical input into 4 channels of CWDM optical signals, and converts them to 8 channels of 50Gb/s (PAM4) electrical output data. The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm as members of the CWDM wavelength grid defined in ITU-T G.694.2. It contains a duplex LC connector for the optical interface and a 76-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module. Host FEC is required to support up to 10km fiber transmission The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP-DD Multi-Source Agreement (MSA) Type 2. It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.

· QSFP-DD MSA compliant

· 4 CWDM lanes MUX/DEMUX design

· 100G Lambda MSA 400G-LR Specification compliant

· Up to 10km transmission on single mode fiber (SMF) with FEC

· Operating case temperature: 0 to 70℃

· 8x53.125Gb/s electrical interface (400GAUI-8)

· Data Rate 106.25Gbps (PAM4) per channel.

· Maximum power consumption 12W

· Duplex LC connector

· RoHS compliant

Absolute Maximum Ratings
It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	T_S	-40		85	°C
Operating Case Temperature	T_OP	0		70	°C
Power Supply Voltage	V_CC	-0.5		3.6	V
Relative Humidity (non-condensation)	RH	0		85	%
Relative Humidity (non-condensation)

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Operating Case Temperature	T_OP	0		70	°C
Power Supply Voltage	V_CC	3.135	3.3	3.465	V
Data Rate, each Lane			26.5625		GBd	PAM4
Data Rate Accuracy		-100		100	ppm
Pre-FEC Bit Error Ratio				2.4x10^-4
Post-FEC Bit Error Ratio				1x10^-12		1
Link Distance	D	0.5		10	km	2

Notes:

1. FEC provided by host system.

2. FEC required on host system to support maximum distance.

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Wavelength Assignment	L0	1264.5	1271	1277.5	nm
	L1	1284.5	1291	1297.5	nm
	L2	1304.5	1311	1317.5	nm
	L3	1324.5	1331	1337.5	nm
Transmitter
Data Rate, each Lane		53.125 ± 100 ppm			GBd
Modulation Format		PAM4
Side-mode Suppression Ratio	SMSR	30			dB	Modulated
Total Average Launch Power	P_T			10	dBm
Average Launch Power, each Lane	P_AVG	-1.4		4.5	dBm	1
Outer Optical Modulation Amplitude (OMA_outer), each Lane	P_OMA	0.7		4.7	dBm	2
Outer Optical Modulation Amplitude (OMA_outer), each Lane
Launch Power in OMA_outer Minus TDECQ, each Lane		-0.7			dB	For ER ≥4.5dB
Launch Power in OMA_outer Minus TDECQ, each Lane		-0.6			dB	For ER<4.5dB
Transmitter and Dispersion Eye Clouser for PAM4, each Lane	TDECQ			3.4	dB
Transmitter and Dispersion Eye Clouser for PAM4, each Lane
Extinction Ratio	ER	3.5			dB
Difference in Launch Power between any Two Lanes(OMA_outer)				4	dB
Difference in Launch Power between any Two Lanes(OMA_outer)
RIN_15.6OMA	RIN			-136	dB/Hz
Optical Return Loss Tolerance	TOL			17.1	dB
Transmitter Reflectance	T_R			-26	dB
Transmitter Transition Time				17	ps
Average Launch Power of OFF Transmitter, each Lane	Poff			-20	dBm
Average Launch Power of OFF Transmitter, each Lane
Receiver
Data Rate, each Lane		53.125 ± 100 ppm			GBd
Modulation Format		PAM4
Damage Threshold, each Lane	TH_d	5.5			dBm	3
Average Receive Power, each Lane		-7.7		4.5	dBm	4
Receive Power (OMA_outer), each Lane				4.7	dBm
Difference in Receiver Power between any Two Lanes(OMA_outer)				4.1	dB

Receiver Sensitivity (OMA_outer), each Lane	SEN			-6.6	dBm	For BER of 2.4E-4
Receiver Sensitivity (OMA_outer), each Lane						For BER of 2.4E-4
Stressed Receiver Sensitivity (OMA_outer), each Lane	SRS	See below picture			dBm	5
Stressed Receiver Sensitivity (OMA_outer), each Lane
Receiver Reflectance	R_R			-26	dB
LOS Assert	LOSA	-30			dBm
LOS De-assert	LOSD			-12	dBm
LOS Hysteresis	LOSH	0.5			dB
Stressed Conditions for Stress Receiver Sensitivity (Note 6)
Stressed Eye Closure for PAM4 (SECQ), Lane under Test		0.9		3.4	dB
Stressed Eye Closure for PAM4 (SECQ), Lane under Test
OMA_outer of each Aggressor Lane			1.5		dBm

Notes:

1. Average launch power, each lane (min) is informative and not the principal indicator of signal strength. A transmitter with launch power below this value cannot be compliant; however, a value above this does not ensure compliance.

2. Even if the TDECQ < 1.4 dB for an extinction ratio of ≥ 4.5 dB or TDECQ < 1.3 dB for an extinction ratio of < 4.5 dB, the OMAouter (min) must exceed the minimum value specified here.

3. The receiver shall be able to tolerate, without damage, continuous exposure to an optical input signal having this average power level.

4. Average receive power, each lane (min) is informative and not the principal indicator of signal strength. A received power below this value cannot be compliant; however, a value above this does not ensure compliance.

5. Measured with conformance test signal for BER = 2.4x10-4. A compliant receiver shall have stressed receiver sensitivity (OMAouter), each lane values below the mask of Figure 4, for SECQ values between 0.9 and 3.4 dB.

6. These test conditions are for measuring stressed receiver sensitivity. They are not characteristics of the receiver.

Electrical Characteristics
The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Power Consumption				12	W
Supply Current	Icc			3.64	A
Transmitter (each Lane)
Signaling Rate, each Lane	TP1	26.5625 ± 100 ppm			GBd
Differential pk-pk Input Voltage Tolerance	TP1a	900			mVpp	1
Differential pk-pk Input Voltage Tolerance
Differential Termination Mismatch	TP1			10	%
Differential Input Return Loss	TP1	IEEE 802.3-2015 Equation (83E-5)			dB
Differential to Common Mode Input Return Loss	TP1	IEEE 802.3-2015 Equation (83E-6)			dB
Differential to Common Mode Input Return Loss
Module Stressed Input Test	TP1a	See IEEE 802.3bs 120E.3.4.1				2
Single-ended Voltage Tolerance Range (Min)	TP1a	-0.4 to 3.3			V
Single-ended Voltage Tolerance Range (Min)
DC Common Mode Input Voltage	TP1	-350		2850	mV	3
Receiver (each Lane)
Signaling Rate, each lane	TP4	26.5625 ± 100 ppm			GBd
Differential Peak-to-Peak Output Voltage	TP4			900	mVpp
Differential Peak-to-Peak Output Voltage
AC Common Mode Output Voltage, RMS	TP4			17.5	mV
AC Common Mode Output Voltage, RMS
Differential Termination Mismatch	TP4			10	%
Differential Output Return Loss	TP4	IEEE 802.3-2015 Equation (83E-2)
Common to Differential Mode Conversion Return Loss	TP4	IEEE 802.3-2015 Equation (83E-3)
Common to Differential Mode Conversion Return Loss
Transition Time, 20% to 80%	TP4	9.5			ps
Near-end Eye Symmetry Mask Width (ESMW)	TP4		0.265		UI
Near-end Eye Symmetry Mask Width (ESMW)
Near-end Eye Height, Differential	TP4	70			mV
Near-end Eye Height, Differential
Far-end Eye Symmetry Mask Width (ESMW)	TP4		0.2		UI
Far-end Eye Symmetry Mask Width (ESMW)
Far-end Eye Height, Differential	TP4	30			mV
Far-end Pre-cursor ISI Ratio	TP4	-4.5		2.5	%
Common Mode Output Voltage (Vcm)	TP4	-350		2850	mV	3
Common Mode Output Voltage (Vcm)

Notes:

1. With the exception to IEEE 802.3bs 120E.3.1.2 that the pattern is PRBS31Q or scrambled idle.

2. Meets BER specified in IEEE 802.3bs 120E.1.1.

3. DC common mode voltage generated by the host. Specification includes effects of ground offset voltage.

Digital Diagnostics

Parameter	Range	Min	Max	Units	Notes
Temperature Monitor Absolute Error	DMI_Temp	-3	3	degC	Over operating temperature range
Temperature Monitor Absolute Error					Over operating temperature range
Supply Voltage Monitor Absolute Error	DMI _VCC	-0.1	0.1	V	Over full operating range
Supply Voltage Monitor Absolute Error					Over full operating range
Channel RX Power Monitor Absolute Error	DMI_RX_Ch	-2	2	dB	1
Channel RX Power Monitor Absolute Error
Channel Bias Current Monitor	DMI_Ibias_Ch	-10%	10%	mA
Channel TX Power Monitor Absolute Error	DMI_TX_Ch	-2	2	dB	1
Channel TX Power Monitor Absolute Error

Notes:

1. Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB fluctuation, or a +/- 3 dB total accuracy.

ESD

This transceiver is specified as ESD threshold 1kV for high speed data pins and 2kV for all other electrical input pins, tested per MIL-STD-883, Method 3015.4 /JESD22-A114-A (HBM). However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.

Laser Safety

This is a Class 1 Laser Product according to EN 60825-1:2014. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).

Caution: Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.