Ascent Communication Technology

40G QSFP CWDM 20 km

Ascent’s QSFP-AQ-LP-W4-20 is a QSFP transceiver designed to operate over single-mode fiber using 4x10 CWDM channels in 1310 band for data links up to 20 km. The module converts 4 inputs channel of 10 Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40 Gb/s optical transmission. On the receiver side, the module optically de-multiplexes a 40 Gb/s input into 4 CWDM channels signals, and converts them to 4 channel output electrical data.

• 4 CWDM lanes Mux/Demux design

• Up to 11.1 Gbps Data rate per wavelength

• Up to 20 km transmission on SMF

• Electrically hot-pluggable

• Digital Diagnostics Monitoring Interface

• Compliant with QSFP+ MSA with LC connector

• Case operating temperature range:0 °C to 70°C

• Power dissipation < 2.5 W

• Compliant to IEEE802.3ba

• Compliant to SFF-8436

• RoHS compliant

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	‑40	‑	85	°C
Relative Humidity	RH	5	‑	95	%
Power Supply Voltage	VCC	‑0.3	‑	4	V
Signal Input Voltage		Vcc‑	‑	Vcc+0.	V

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0	‑	70	°C	Without air
Power Supply Voltage	VCC	3.1	3.3	3.47	V
Power Supply Current	ICC	‑		760	mA
Data Rate	BR		10.31		Gbp	Each
Transmission Distance	TD		‑	20	km
Coupled fiber	Single‑mode fiber					9/125 µm

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Wavelength	λ0	1264.5	1271	1277.5	nm
	λ1	1284.5	1291	1297.5	nm
	λ2	1304.5	1311	1317.5	nm
	λ3	1324.5	1331	1337.5	nm
Total Output Power	P_OUT			8.3	dBm
Average Launch Power per lane		‑7		2.3	dBm
Spectral Width (‑20 dB)	σ			1	nm
SMSR		30			dB
Optical Extinction Ratio	ER	3.5			dB
Average Launch Power Off per Lane	P_OFF			‑30	dBm
RIN	RIN			‑128	dB/Hz
Output Eye Mask	Compliant with IEEE 802.3ba
Receiver
Rx Sensitivity per Lane (OMA)	R_SENS			‑13.7	dBm	1
Input Saturation Power (Overload)	Psat	2.3			dBm
Receiver Reflectance	Rr			‑26	dB

Notes:

1. Measured with a PRBS 2³¹‑1 test pattern, @10.325 Gb/s, BER<10^‑12.

Electrical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply Voltage	Vcc	3.13	3.3	3.47	V
Supply Current	Icc			760	mA
Transmitter
Input Differential Impedance	Rin		100		Ω	1
Differential Data Input Swing	Vin, pp	180		1000	mV
Transmit Disable Voltage	VD	Vcc‑1.3		Vcc	V
Transmit Enable Voltage	VEN	Vee		Vee+0.8	V	2
Transmit Disable Assert Time				10	µs
Receiver
Differential Data Output Swing	Vout, pp	300		850	mV	3
Data Output Rise Time	tr	28			ps	4
Data Output Fall Time	tf	28			ps	4
LOS Fault	VLOS_fault	Vcc‑1.3		VccHOST	V	5
LOS Normal	VLOS	Vee		Vee+0.8	V	5