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. The module is designed for 10 km optical communication applications, and it is compliant with 100G Lambda MSA standard. This module can convert 8-channel 53.125 Gbps electrical data to 4-channel 106.25 Gbps optical signals, and multiplex them into a single channel for 425 Gbps optical transmission. Similarly, it optically de-multiplexes a 425 Gbps input into 4-channel signals, and converts them to 8-channel output electrical data on the receiver side.

· 4x106.25Gbps PAM4 parallel lanes

· 8x53.125Gbps PAM4 electrical interface(400GAUI-8)

· 4 duplex channels transmitters and PIN receivers

· 4 CWDM lanes MUX/DEMUX design

· Maximum power consumption 9W

· LC duplex connector

· Up to 10km transmission on single mode fiber

· Operating case temperature: 0°C to 70°C

· Single 3.3V power supply

· QSFP-DD MSA compliant rev5.0 compliant

· Compliant to IEEE 802.3cu

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
Maximum Supply Voltage	V_CC	-0.5	3.3	3.6	V
Storage Temperature	T_s	-40		85	°C
Relative Humidity	RH	10		85	%	Non-condensing
Damage Threshold, each Lane	THd	4.5			dBm

Recommended Operating Conditions
Electrical and optical characteristics below are defined under this operating environment, unless otherwise specified.

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply Voltage	Vcc	3.135	3.3	3.465	V
Case Temperature	Top	0		70	°C
Link Distance with G.652		0		10	km

Optical Characteristics

Parameters	Min	Typ	Max	Unit	Note
Transmitter
Data Rate, each Lane	53.125 ± 100 ppm			GBd
Modulation Format	PAM4
Line Wavelengths	1264.5	1271	1277.5	nm
	1284.5	1291	1297.5
	1304.5	1311	1317.5
	1324.5	1331	1337.5
Total Average Launch Power			9.5	dBm
Average Launch Power, each Lane	-2.8		4	dBm
Optical Modulation Amplitude (OMA), each Lane	0.2		4.2	dBm
Extinction Ratio (ER)	3.5			dB
Side-Mode Suppression Ratio (SMSR)	30			dB
Launch Power in OMA Minus TDECQ, each Lane, for ER ≥ 4.5 dB	-1.2			dB
Launch Power in OMA Minus TDECQ, each Lane, for ER < 4.5 dB	-1.1			dBm
Transmitter and Dispersion Eye Closure for PAM4, each Lane (TDECQ)			3.9	dB
Difference in Launch Power between Any Two Lanes (OMA Outer)			4	dB
RIN17.1OMA			-136	dB/Hz
Optical Return Loss Tolerance			17.1	dB

Parameters	Min	Typ	Max	Unit	Note
Transmitter Reflectance			-26	dB
Average Launch Power of OFF Transmitter, each Lane			-20	dBm
Receiver
Data Rate, each Lane	53.125 ± 100 ppm			GBd
Modulation Format	PAM4
Damage Threshold, each Lane	4.5			dBm
Line Wavelengths	1264.5	1271	1277.5	nm
	1284.5	1291	1297.5
	1304.5	1311	1317.5
	1324.5	1331	1337.5
Average Receiver Power, each Lane	-9.1		4	dBm
Receiver Power, each Lane (OMA)			4.2	dBm
Difference in Receiver Power between Any Two Lanes (OMA)			4.1	dB
Receiver Sensitivity (OMA Outer), each Lane (Max)	Max (-6.6, -8+ SECQ )			dBm	1
LOS Assert	-20			dBm
LOS Deassert			-8.6	dBm
LOS Hysteresis	0.5			dB
Receiver Reflectance			-26	dB
Conditions of Stressed Receiver Sensitivity
Stressed Eye Closure for PAM4 (SECQ), Lane Under test	0.9		3.4	dB
OMA Outer of Each Aggressor Lane		1.5		dBm
Long Term Performance Test
BER FLOOR	1E -6 @ -3.1 to 2 dBm

Note: Measured with conformance test signal for BER = 2.4 x 10^-4. A compliant receiver shall have stressed receiver sensitivity (OMA outer), each lane values below the mask of below figure, for SECQ values between 0 and 3.9 dB.

Electrical Characteristics

Parameter	Min	Typ	Max	Unit	Note
Power Consumption			9	W
Supply Current			2.86	A
Receiver (module input)
Data Rate, each Lane	26.5625 ± 100 ppm			GBd
Overload Differential Voltage Pk-Pk	900			mV
Common Mode Voltage	–350		2850	mV
Differential Termination Resistance Mismatch			10	%	At 1 MHz
Differential Return Loss (SDD11)	Equation (16-1)			dB	OIF-CEI-56G-VSR-PAM4
Common Mode to Differential Mode Conversion (SCD11)	Equation (16-2)			dB	OIF-CEI-56G-VSR-PAM4
Stressed Input Test	See OIF-CEI-56G-VSR-PAM4 Section 16.3.10.3
Transmitter (module output)
Data Rate, each Lane	26.5625 ± 100 ppm			GBd
Differential Voltage, Pk-Pk			900	mV
Common Mode Voltage (Vcm)	–350		2850	mV
Common Mode Noise, RMS			17.5	mV
Differential Termination Resistance Mismatch			10	%	At 1 MHz
Differential Return Loss (SDD22)			Equation (16-1)	dB
Common Mode to Differential Mode Conversion (SDC22)			Equation (16-3)	dB
Common Mode Return Loss (SCC22)			–2	dB	From 250 MHz to fb GHz
Transition Time	9.5			ps
Near-End Eye Width at 10^-6 Probability (EW6)	0.265			UI
Near-End Eye Height at 10^-6 Probability (EH6)	70			mV
Far-End Eye Width at 10^-6 Probability (EW6)	0.20			UI
Far-End Eye Height at 10^-6 Probability (EH6)	30			mV
Near-End Eye Linearity	0.85