Ascent Communication Technology

100G QSFP28 LR Single λ 10 km

Ascent’s QSFP28 100G LR1 Ethernet module is a transceiver module designed for 10 km optical communication applications, and it is compliant with IEEE 802.3cd and QSFP28 MSA standard. QSFP28-100G-LR10 can be used in Data Centers, High-speed interconnects within and between switches, routers and transport equipment, Server- Server Clusters, Super-computing interconnections and other network applications. This module incorporates one channel optical signal, on 1310nm center wavelength, operating at 50G baud data rate. The transmitter path incorporates an EML Driver integrated in the DSP and a cooled EML together. On the receiver path, the input optical signal is coupled to a Pin photodiode detector. It is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.

·       QSFP28 MSA compliant
·       IEEE 802.3cu compliant
·       Optical light source: single channel 1310nm EA-DFB LD
·       Optical receiver: single channel PIN photo detector
·       Max. power consumption 4.5 W
·       Up to 10 km transmission on single-mode fiber
·       LC connector
·       Single 3.3V power supply
·       RoHS 2.0 compliant

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	Vcc	-0.3	3.3	3.6	V
Storage Temperature	Ts	-40		85	°C
Relative Humidity	Rh	0		85	%	1
Optical Receiver Input				5.5	dBm	Average

Note:

1. Non-condensing.

Operating Environments

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

Parameter Operating Case Temperature	Symbol Top	Min. 0	Typ.	Max. 70	Unit. °C	Note
Supply Voltage	Vcc	3.135	3.3	3.465	V
Supply Current				1154.4	mA	Steady state
Data Rate per Lane			25.78125		Gbit/s
Data Rate Accuracy		-100		100	ppm
Link Distance with G.652				10	km

Electrical Characteristics

Parameter	Symbol	Min. Typ. Max.		Unit	Note
Module Supply Current	Icc	1.212		A
Power Dissipation	P	4.50		W
Data Rate, each Lane		25.78125 ppm ± 100 ppm		GBd
Transmitter
Differential Input Voltage pk-pk	Vpp	900		mV
Common Mode Voltage Single-Ended Input Voltage Tolerance Range Differential Termination Resistance Mismatch	Vcm	-350 -0.4 to 3.3	2850 10	mV V %	At 1 MHz
Transition Time		12		ps	20%-80%
Receiver
AC Common-Mode Output Voltage (RMS)			17.5	mV
Overload Differential Voltage pk-pk	Vpp		900	mV
Eye Width at 10^-15 Probability	EW15	0.57		UI
Eye Height at 10^-15 Probability	EH15	228		mV
Vertical Eye Closure			5.5	dB
Common Mode Voltage	Vcm	-350	2850	mV
Differential Termination Resistance Mismatch			10	%

Optical Characteristics

Parameter Transmitter	Min.	Typ.	Max.	Unit
Data Rate	53.125 ppm ± 100 ppm			GBd
Modulation Format	PAM4
Transmitter Wavelengths	1304.5	1311	1317.5	nm
Average Launch Power	-1.4		4.5	dBm
Optical Modulation Amplitude (OMA)	0.7		4.7	dBm
Extinction Ratio (ER)	3.5			dB
Side Mode Suppression Ratio (SMSR)	30			dB
Launch Power in OMA minus TDECQ	-0.7 (ER ≥ 4.5dB)			dBm
	-0.6 (ER < 4.5dB)
TDECQ-10log 10(Ceq)			3.4	dB
Transmitter and Dispersion Eye Closure for PAM4,			3.4	dB
(TDECQ)
Transmitter Transition Time			17	ps
Optical Return Loss Tolerance			15.6	dB
Transmitter Reflectance			-26	dB
Average Launch Power of OFF Transmitter			-15	dBm
RIN15.6 OMA (Max.)			-136	dB/Hz
Receiver
Data Rate	53.125 ± 100 ppm			GBd
Modulation Format	PAM4
Receiver Wavelengths	1304.5	1311	1317.5	nm
Damage Threshold	5.0			dBm
Average Receiver Power	-7.1		4.0	dBm
Receiver Power (OMA)			4.2	dBm
Receive Sensitivity (OMA Outer) (Max.)			-4.5	dBm
Stressed Receiver Sensitivity (OMA Outer) (Max.)¹			-5.9+TECQ -2.5	dBm
LOS Assert	-15
LOS De-Assert			-8.6	dBm
LOS Hysteresis	0.5			dB
Receiver Reflectance Conditions Of Stressed Receiver Sensitivity²			-26	dB
Stressed Eye Closure for PAM4 (SECQ), Lane Under Test			3.4	dB

Notes:
1. Measured with conformance test signal for BER = 2.4 x 10 - 4.

2. There test conditions are for measuring stressed receiver sensitivity. They are not characteristics of the receiver.

Digital Diagnostic Monitoring Functions

QSFP28-100G-LR10 supports the I2C based Diagnostic Monitoring Interface (DMI) defined in document SFF- 8636. The host can access real time performance of transmitter and receiver optical power, temperature, supply voltage and bias current.

Performance item	Data Address Alarm & Warning	Alarm & Warning thresholds	Monitor
Module Temperature	Lowpage 6	Page03 (128-135)	Lowpage (22-23)
Module Voltage	Lowpage 7	Page03 (144-151)	Lowpage (26-27)
Bias Current	Lowpage (11-12)	Page03 (184-191)	Lowpage (42-49)
Transmitter Optical Power	Lowpage (13-14)	Page03 (192-199)	Lowpage (50-57)
Receiver Optical Power	Lowpage (9-10)	Page03 (176-183)	Lowpage (34-41)

ESD Design

Normal ESD precautions are required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and otherwise handled in an ESD protected environment utilizing standard grounded benches, floor mats, and wrist straps.

Parameter	Threshold	Notes
ESD of High-Speed Pins	1KV	Human Body Model
ESD of Low-Speed Pins	2KV	Human Body Model
Air Discharge During Operation	15KV
Direct Contact Discharges to the Case	8KV