Ascent Communication Technology

40G QSFP+ ER4 40 km

Ascent QSFP+ ER4 is designed to operate over singlemode fiber system using 4 × 10 CWDM channels in 1310 band and links up to 40 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 output channels of electrical data. The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm. It contains a duplex LC connector for the optical interface and a 38-pin connector for the electrical interface. Single-mode fiber (SMF) is applied in this module. This product converts the 4- channel 10 Gb/s electrical input data into CWDM optical signals (light), by a 4-wavelength Distributed Feedback Laser (DFB) array. The 4 wavelengths are multiplexed into a single 40 Gb/s data, propagating out of the transmitter module via the SMF. The receiver module accepts the 40Gb/s optical signals input, and de-multiplexes it into 4 CWDM 10 Gb/s channels. Each wavelength light is collected by a discrete photo diode, and then outputted as electric data after amplified by a TIA. The product is designed with form factor, optical / electrical connection and digital diagnostic interface according to the QSFP+ Multi-Source Agreement (MSA) and compliant to 40G QSFP+ ER4 of IEEE 802.3ba.

· 4 CWDM lanes MUX/DEMUX design

· Up to 11.2Gbps per channel bandwidth

· Aggregate bandwidth of > 40Gbps

· Duplex LC connector

· Compliant with 40G Ethernet IEEE802.3ba and 40GBASE-ER4 Standard

· QSFP MSA compliant

· APD photo-detector

· Up to 40km transmission

· Compliant with QDR/DDR Infiniband data rates

· Single +3.3V power supply operating

· Built-in digital diagnostic functions

· Temperature range 0°C to 70°C

· RoHS Compliant Part

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	T_S	-40		+85	°C
Supply Voltage	V_CC	-0.5		4	V
Relative Humidity	RH	0		85	%

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case operating Temperature	T_C	0		+70	°C
Supply Voltage	V_CCT, _R	+3.13	3.3	+3.47	V
Supply Current	I_CC			1000	mA
Power Consumption	PD			3.5	W

Electrical Characteristics (TOP = 0 to 70 °C, VCC = 3.13 to 3.47 Volts)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Data Rate per Channel		-	10.3125	11.2	Gbps
Power Consumption		-	2.5	3.5	W
Supply Current	Icc		0.75	1.0	A
Control I/O Voltage-High	VIH	2.0		Vcc	V
Control I/O Voltage-Low	VIL	0		0.7	V
Inter-Channel Skew	TSK			150	Ps
RESETL Duration			10		Us
RESETL De-assert time				100	ms
Power On Time				100	ms
Transmitter
Single Ended Output Voltage Tolerance		0.3		4	V	1
Common Mode Voltage Tolerance		15			mV
Transmit Input Diff Voltage	VI	150		1200	mV
Transmit Input Diff Impedance	ZIN	85	100	115
Data Dependent Input Jitter	DDJ		0.3		UI
Receiver
Single Ended Output Voltage Tolerance Rx Output Diff Voltage		0.3		4	V

	Vo	370	600	950	mV
Rx Output Rise and Fall Voltage	Tr/Tf			35	ps	1
Total Jitter	TJ		0.3		UI

Notes:
1. 20 to 80%

Optical Parameters (TOP = 0 to 70 °C, VCC = 3.0 to 3.6 Volts)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
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
Side-mode Suppression Ratio	SMSR	30	-	-	dB
Total Average Launch Power	PT	-	-	8.3	dBm
Average Launch Power, each Lane		-1	-	5	dBm
TDP, each Lane	TDP			2.3	dB
Extinction Ratio	ER	5	6.0		dB
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}		{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}
		{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}
Optical Return Loss Tolerance		-	-	20	dB
Average Launch Power OFF Transmitter, each Lane	Poff			-30	dBm
Relative Intensity Noise	Rin			-128	dB/HZ	1
Optical Return Loss Tolerance		-	-	12	dB
Receiver
Damage Threshold	THd	3			dBm	1
Average Power at Receiver Input, each Lane	R	-21		-6	dBm
Average Power at Receiver Input, each Lane
Receive Electrical 3 Db Upper Cut off Frequency, each Lane				12.3	GHz
Receive Electrical 3 Db Upper Cut off Frequency, each Lane
RSSI Accuracy		-2		2	dB
Receiver Reflectance	Rrx			-26	dB
Receive Electrical 3 dB upper Cutoff Frequency, each Lane		-	-	3.5	GHz
Receive Electrical 3 dB upper Cutoff Frequency, each Lane
LOS De-Assert	LOS_D			-25	dBm
LOS Assert	LOS_A	-35			dBm
LOS Hysteresis	LOS_H	0.5			dB