Ascent Communication Technology

100G QSFP28 LR4 1310 nm 10 km

Ascent’s 100G QSFP28 LR4 is designed for 10km optical communication applications. This module contains 4-lane optical transmitter, 4-lane optical receiver and module management block including 2 wire serial inter-face. The optical signals are multiplexed to a single-mode fiber through an industry standard LC connector. Ascent’s 100G QSFP28 LR4 Optical Transceiver integrates receiver and transmitter path on one module. In the transmit side, four lanes of serial data streams are recovered, retimed, and passed to four laser drivers. The laser drivers control 4 × Distributed Feedback Laser (DFB) with center wavelengths of 1296 nm, 1300 nm, 1305 nm, and 1309 nm. The optical signals are multiplexed to a single-mode fiber through an industry standard LC connector. In the receive side, the four lanes of optical data streams are optically de-multiplexed by the integrated optical de-multiplexer. Each data stream is recovered by a PIN photo-detector and trans-impedance amplifier, retimed. This module features a hot-pluggable electrical interface, low power consumption and MDIO management interface. This product is designed with form factor, optical/electrical connections, and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA) and compliant to IEEE 802.3bm.

• Support line rates from 103.125 Gbps

• Transmission data rate up to25.78 (NRZ) per channel

• Up to 10km transmission on single mode fiber

• LAN WDM DML laser and PIN ROSA

• High speed I/O electrical interface (CAUI-4)

• I2C interface with integrated Digital Diagnostic monitoring

• QSFP28 MSA package with duplex LC connector

• Single +3.3V power supply dissipation

Commercial：< 4W

Industrial：<5W

• Temperature Range:

Commercial：0°C to +70°C

Industrial：-40°C to +85°C

• Complies with EU Directive 2015/863/EU

Absolute Maximum Ratings

Parameter

Storage Temperature

Symbol

Min.

-40

Max.

Unit

°C

Maximum Supply Voltage

V_CC

-0.5

3.6

Operating Relative Humidity

Recommended Operating Conditions

Parameter Operating Case Temperature	Symbol Top	Min. 0	Typ.	Max. +70	Unit °C	Note QSFP28-100G-LP10
Parameter Operating Case Temperature		-40		+85	°C	QS28-100G-LP10A
Power Supply Voltage	V_CC	3.13	3.3	3.47	V
Power Supply Current	I_CC	-		1.21	A	QSFP28-100G-LP10
Power Supply Current				1.51	A	QS28-100G-LP10A
Maximum Power	P_D			4	W	QSFP28-100G-LP10
Dissipation				5		QS28-100G-LP10A
Aggregate Bit Rate	BRAVE		103.125		Gb/s
Lane Bit Rate	BRLANE		25.78125		Gbps
Transmission Distance	TD			10	km
Coupled Fiber	Single-mode fiber					9/125 µm SMF

Optical Characteristics

Parameter Transmitter	Symbol	Min	Typ	Max	Unit	Note
Signaling Speed per Lane			25.78125		Gbps
Wavelength Assignment	L0	1294.53	1295.56	1296.59	nm
Lane Wavelength	L1	1299.02	1300.05	1301.09	nm
	L2	1303.54	1304.58	1305.63	nm
	L3	1308.09	1309.14	1310.19	nm
Total Average Launch Power	P_T			10.5	dBm	1
Average Launch Power per Lane,	P_avg	-4.3		4.5	dBm	1
OMA, Each Lane	P_OMA	-1.3		4.5	dB	1
Difference in Launch Power between any Two Lanes(Average and OMA) between any Two Lanes (OMA)	P_tx, diff			3	dB
Average Output Power (Laser Turn off)	Poff			-30	dBm
Side Mode Suppression Ratio	SMSR	30			dB
Extinction Ratio	ER	4			dB
RIN20OMA	RIN			-130	dB/Hz
Optical Return Loss Tolerance	TOL			20	dB
Transmitter Reflectance	RT			-12	dB
Optical Eye Mask	{0.25,0.4, 0.45, 0.25, 0.28, 0.4}				%	2
Receiver
Signaling Rate, Each Lane	25.78125				Gbps
Center Wavelength Lane 0	λ0	1294.53	1295.56	1296.59	nm
Center Wavelength Lane 1	λ1	1299.02	1300.05	1301.09	nm
Center Wavelength Lane 2	λ2	1303.54	1304.58	1305.63	nm
Center Wavelength Lane 3	λ3	1308.09	1309.14	1310.19	nm
Damage Threshold , Each Lane	Pdamage	5.5			dBm
Average Receive Power, Each Lane		-10.6		4.5	dBm
Receiver Sensitivity (OMA) per Lane	SEN			-8.6	dBm	3
Los Assert	LosA	-30			dBm
Los De-assert	LosDA			-12	dBm
Los Hysteresis	LosH	0.5			dB

Notes:
  1.      The optical power is launched into SMF.
2.      Measured with a PRBS 231-1 test pattern @25.78125, Hit ratio≤5E^-5.
3.      Measured with a PRBS 231-1 test pattern @25.78125 Gb/s, BER≤1E^-12.

Electrical Characteristics

Parameter	Symbol	Min	Typ	Max	Unit	Note
Transmitter (Module Input)
Data Rate, Each Lane			25.78125		Gbps
Differential Voltage pk-pk	Vpp			900	mV	1
Common Mode Voltage	Vcm	-350		2850	mV
Transition Time	Trise/Tf all	10			ps	2
Receiver (Module Output)
Data Rate, Each Lane			25.78125		Gbps
Common Mode Noise, RMS	Vrms			17.5	mV
Differential Output Voltage Wwing	Vout, pp			900	mV
Eye Width	EW15	0.57			UI
Eye Height	EH15	228			mV
Differential Termination Resistance Mismatch				10	%	1
Transition Time	Trise/Tf all	12			ps