Ascent Communication Technology

4X100G QSFP-DD LR4 10km

Ascent’s QDD-4X100G-LR4 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 parallel optical signals, each capable of 100Gb/s operation for an aggregate data rate of 400Gb/s. Reversely, on the receiver side, the module converts 4 channels of parallel optical signals of 100Gb/s each channel for an aggregate data rate of 400Gb/s into 8 channels of 50Gb/s (PAM4) electrical output data. An optical fiber cable with an MTP/MPO-12/APC connector can be plugged into the module receptacle. Proper alignment is ensured by the guide pins inside the receptacle. The cable usually cannot be twisted for proper channel to channel alignment. Electrical connection is achieved through a QSFP-DD MSA-compliant edge type connector. This product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP-DD MSA Type2. It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. I2C interface is supported to read and control the status of this product.

· QSFP-DD MSA Compliant

· CMIS4.0 compliance

· Optical Interface: IEEE 802.3cu CL140 compliant

· Electrical Interface: IEEE 802.3bs 400GAUI-8

· Support 425Gb/saggregate bit rate

· 4 Parallel optical lanes

· MPO-12/APC connector

· Up to 10km transmission on SMF with FEC

· Operating case temperature 0 to 70°C

· Maximum power consumption 12W

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		75	°C
Power Supply Voltage	V_CC	3.135	3.3	3.465	V
Data Rate, each Lane			53.125		GBd	PAM4
Data Rate Accuracy		-100		100	ppm
Pre-FEC Bit Error Ratio				2.4x10^-4
Post-FEC Bit Error Ratio				1x10^-15		1
Link Distance	D1	2		10000	m	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
Center Wavelength	λc	1304.5	1311	1317.5	nm
Transmitter
Data Rate, each Lane		53.125 ± 100 ppm			GBd
Modulation Format		PAM4
Side-mode Suppression Ratio	SMSR	30			dB
Average Launch Power, each Lane	P_AVG	-1.9		4.8	dBm	1
Outer Optical Modulation Amplitude (OMAouter), each Lane	P_OMA	Max(1.1,-0.3+TDECQ)		5	dBm	2
Outer Optical Modulation Amplitude (OMAouter), each Lane		Max(1.1,-0.3+TDECQ)
Transmitter and Dispersion Eye Closure for PAM4 (TDECQ), each Lane	TDECQ			3.4	dB


Transmitter Eye Closure for PAM4 (TECQ), each Lane	TECQ			3.4	dB
Transmitter Eye Closure for PAM4 (TECQ), each Lane
\|TDECQ-TECQ\|				2.5	dB
Over/Under-Shoot				22	%
Transmitter Power Excursion				2.8	dBm
Extinction Ratio	ER	3.5			dB
RIN15.6OMA	RIN			-136	dB/Hz
Optical Return Loss Tolerance	TOL			15.6	dB
Transmitter Reflectance	RT			-26	dB	3
Transmitter Transition Time				17	ps

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Average Launch Power of OFF Transmitter, each Lane	Poff			-15	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	5.8			dBm	4
Average Receive Power, each Lane		-8.2		4.8	dBm	5
Receive Power (OMA_outer), each Lane				5	dBm
Receiver Sensitivity (OMA_outer), each Lane	SEN			Equation(1)	dBm	6
Receiver Sensitivity (OMA_outer), each Lane
Stressed Receiver Sensitivity (OMA_outer), each Lane	SRS			-4.1	dB	7
Stressed Receiver Sensitivity (OMA_outer), each Lane
Receiver Reflectance	R_R			-26	dB
LOS Assert	LOSA	-15		-12.1	dBm
LOS De-assert	LOSD			-9.1	dBm
LOS Hysteresis	LOSH	0.5			dB
Conditions for Stress Receiver Sensitivity (Note 8)
Stressed Eye Closure for PAM4 (SECQ), Lane under Test			3.4		dB
Stressed Eye Closure for PAM4 (SECQ), Lane under Test

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. The values for OMAouter(min) vary with TDECQ. Below figure illustrates this along with the values for OMAouter(max).

3. Transmitter reflectance is defined looking into the transmitter.

4. The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. The receiver does not have to operate correctly at this input power.

5. 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.

6. Receiver sensitivity (OMAouter) is informative and is defined for a transmitter with a value of TECQ up to 3.4 dB. Receiver sensitivity should meet Equation (1), which is illustrated in below figure.
RS = max(−6.1, SECQ – 7.5) dBm

Where: RS is the receiver sensitivity, and TECQ is the TECQ of the transmitter used to measure the receiver sensitivity.

7. Measured with conformance test signal at TP3 for the BER equal to 2.4x10^-4.

8. 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
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 Input Return Loss	TP1	IEEE 802.3 2022 Equation (83E-5)			dB
Differential to Common Mode Input Return Loss	TP1	IEEE 802.3 2022 Equation (83E-6)			dB
Differential Termination Mismatch	TP1			10	%
Module Stressed Input Test	TP1a	See IEEE 802.3bs 120E.3.4.1				2
Single-ended Voltage Tolerance Range (Min)	TP1a	-0.4		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
AC Common Mode Output Voltage, (RMS)	TP4			17.5	mV
AC Common Mode Output Voltage, (RMS)
Differential Peak-to-Peak Output Voltage	TP4			900	mV
Differential Peak-to-Peak Output Voltage
Near-end ESMW (Eye Symmetry Mask Width)	TP4	0.265			UI
Near-end ESMW (Eye Symmetry Mask Width)
Near-end Eye height, Differential	TP4	70			mV
Far-end ESMW (Eye Symmetry Mask Width)	TP4	0.2			UI
Far-end ESMW (Eye Symmetry Mask Width)
Far-end Eye Height, Differential	TP4	30			mV
Far-end Pre-cursor ISI Ratio	TP4	-4.5 to +2.5			%
Differential Output Return Loss	TP4	IEEE 802.3 2022 Equation (83E-2)			dB
		IEEE 802.3 2022 Equation (83E-2)
Common-to-Differential- Mode Output Return Loss	TP4	IEEE 802.3 2022 Equation (83E-3)			dB
Common-to-Differential- Mode Output Return Loss

Differential Termination Mismatch	TP4			10	%
Transition Time, 20% to 80%	TP4	9.5			ps
DC Common-Mode Voltage	TP4	-350		2850	mV

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
The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

Parameter	Range	Min	Max	Units	Notes
Temperature Monitor Absolute Error	DMI_Temp	-3	3	°C	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