Ascent Communication Technology

100G CFP2 ER4 40 km

Ascent’s 100G CFP2 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 four EMLs (Electric-absorption Modulated Lasers) with center wavelength of 1296 nm, 1300nm, 1305nm 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 SOA to amplify, then go to PIN photo-detector and trans-impedance amplifier, retimed. This module features a hot-pluggable electrical interface, low power consumption and MDIO management interface.

• Compliant with 100GBASE-ER4

• Support line rates from 103.125 Gbps to 111.81 Gbps

• Integrated LAN WDM EML TOSA, SOA, ROSA for up to 40 km reach over SMF

• Digital Diagnostics Monitoring Interface

• Duplex LC optical receptacle

• No external reference clock

• Single 3.3 V power supply

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

• Power dissipation < 9W

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Storage Temperature	Ts	‑40	‑	85	°C
Relative Humidity	RH	5	‑	95	%
Power Supply Voltage	VCC	‑0.3	‑	4	V
Signal Input Voltage		Vcc‑0.3	‑	Vcc+0.3	V
Receive Input Optical Power (Damage Threshold)	Pdmg			5.0	dBm

Low Speed Electrical Characteristics

Parameter	Symbol	Min..	Typ.	Max.	Unit	Notes
Supply Currents and Voltages
Voltage	Vcc	3.2	3.3	3.4	V	With Respect to GND
Supply Current	Icc			2.3	A
Power Dissipation	Pwr			9.0	W
Power Dissipation (Low Power Mode)	Plp			2.5	W
Low Speed Control and Sense Signals, 3.3 V LVCMOS
Outputs Low Voltage	V_OL			0.2	V	I_OH=100 μA
Output High Voltage	V_OH	Vcc‑0.2			V	I_OH=‑100 μA
Input Low Voltage	V_IL	‑0.3		0.8	V
Input High Voltage	V_IH	2		Vcc3+0.3	V
Input Leakage Current	I_IN	‑10		10	μA
Low Speed Control and Sense Signals, 1.2 V LVCMOS
Outputs Low Voltage	V_OL	‑0.3		0.2	V
Output High Voltage	V_OH	1.0		1.5	V
Output Low Current	I_OL	4			mA
Output High Current	I_OH			‑4	mA
Input Low Voltage	V_IL	‑0.3		0.36	V
Input High Voltage	V_IH	0.84		1.5	V
Input Leakage Current	I_IN	‑100		100	μA
Input Capacitance	C			10	pF
MDC Clock Rate		0.1		4	MHz

High Speed Electrical Specifications

Parameter	Symbol	Min.	Max.	Unit	Notes
Transmitter Electrical Input from Host
Differential Voltage pk‑pk		100	1200	mV
Common Mode Noise (rms)			17.5	mV
Differential Termination Mismatch			10	%
Transition Time		10		ps	20/80 %
Common Mode Voltage		‑0.3	2.8	V
Eye Width	EW15	0.46		UI	At10‑15probability
Eye Height	EH15	100		mV	At 10‑15 probability
Receiver Electrical Output to Host
Differential Voltage pk‑pk		100	1200	mV
Common Mode Noise (rms)			17.5	mV
Differential Termination Mismatch			10	%
Transition Time		9.5		ps	20/80 %
Vertical Eye Closure	VEC		6.5	dB
Eye Width	EW15	0.57		UI	At 10‑15 probability
Eye Height	EH15	240		mV	At 10‑15 probability

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Transmitter
Signaling Speed per Lane			25.78125		Gbps
Wavelength Assignment	λ0	1294.53	1295.56	1296.59	nm
	λ1	1299.02	1300.05	1301.09	nm
	λ2	1303.54	1304.58	1305.63	nm
	λ3	1308.09	1309.14	1310.19	nm
Rate Tolerance		‑100		100	ppm	1
Side‑Mode Suppression Ratio	SMSR	30			dB
Total Launch Power				8.9	dBm
Average Launch Power, per Lane	Pavg	‑2.9		2.9	dBm
Extinction Ratio	ER	8			dB
Optical Modulation Amplitude, per Lane (OMA)	OMA	0.1			dBm
Difference in Launch Power between any Two Lanes (Average and OMA)				3.6	dB
Transmitter and Dispersion Penalty, per Lane	TDP			2.5	dB
Average Launch Power of OFF Transmitter, per Lane				‑30	dBm
Transmitter Reflectance				‑12	dB
Output Eye Mask definition {X1, X2, X3, Y1, Y2, Y3}	{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}
Receiver
Signaling Rate, Each Lane			25.78125		Gbps
Rate Tolerance		‑100		100	ppm	1
Average Receive Power, per Lane	Pavg	‑20.9		4.5	dBm
Receive Power, per Lane (OMA)				4.5	dBm
Difference in Launch Power between any Two Lanes (Average and OMA)				4.5	dB
Receiver Sensitivity (OMA), per Lane	Rsen			‑21.4	dBm	2
Stressed Receiver Sensitivity (OMA), per Lane	SRS			‑17.9	dBm
Stressed Receiver Sensitivity Test Conditions
Vertical Eye Closure Penalty, per Lane	VECP		3.5		dB
Stressed Sys J2 Jitter, per Lane	J2		0.3		UI	3
Stressed Sys J9 Jitter, per Lane	J9		0.47		UI	3
Receiver Reflectance				‑26	dB
Los Assert	Plos_on	‑36			dBm
Los De‑Assert	Plos_off			‑24	dBm
Los Hysteresis		0.5		4	dB

Notes:

1. From nominal rate

2. Receiver sensitivity (OMA), per lane, is informative.

3. Vertical eye closure penalty, stressed eye J2 Jitter, and stressed eye J9 Jitter are test conditions for measuring stressed receiver sensitivity. They are not characteristics of the receiver.