200G QSFP56 SR4 Optical Transceiver

4x26.5625 GBd PAM4 transmitter and PAM4 receiver

4 channels 850 nm VCSEL array

4 channels PIN photo detector array

Single +3.3V power supply

Power consumption < 5W

Operation case temperature: 0 to 70°C

Absolute Maximum Ratings

Parameter	Unit	Min.	Typical	Max.	Notes
Storage Temperature	°C	-40		85
Operating Relative Humidity	%	0		85
Power Supply Voltage	V	-0.5		3.63
Damage Threshold	dBm	5

Recommended Operating Conditions

Parameter	Unit	Min.	Typical	Max.	Notes
Operating Case Temperature	°C	0		70	1
Power Supply Voltage	V	3.135	3.3	3.465
Power Supply Current	A			1.6
Power Consumption	W			5
Pre-FEC Bit Error Ratio			2.4E-4		2
Post-FEC Bit Error Ratio			1E-12		2
Bit Rate	Gbps		212.5

Note：

1.Case Temperature here is depending on module case around TOSA, please do remember it is NOT the environmental temperature .

2.FEC is provided by host system.

Electrical Characteristics

Parameter	Unit	Min.	Typical	Max.	Test point1	Notes
Transmitter
Signaling Rate per lane (range)	GBd	26.5625 ± 100 ppm			TP1
Differential pk-pk Input Voltage Tolerance	mVpp	900			TP1a	2
Differential Input Return Loss	dB	Equation (83E-5)			TP1
Differential to Common Mode Input Return Loss	dB	Equation (83E-6)			TP1
Differential Termination Mismatch	%			10	TP1
Module Stressed Input Test		See 120E.3.4. 1			TP1a	3
Single-ended Voltage Tolerance Range	V	-0.4		3.3	TP1a
DC Common Mode Voltage	mV	-350		2850	TP1	4
Receiver
Signaling Rate per lane(range)	GBd	26.5625 ± 100 ppm			TP4
Differential pk-pk Output Voltage Tolerance	mVpp			900	TP4
AC Common-Mode Output Voltage, RMS	mV			17.5	TP4
Differential Output Return Loss		Equation (83E-2)			TP4
Common to Differential Mode Conversion		Equation (83E-3)			TP4
Differential Termination Mismatch	%			10	TP4
Transition Time, 20% to 80%	ps	9.5			TP4
Near-end ESMW (Eye Symmetry Mask Width)	UI		0.265		TP4
Near-end Eye Height, Differential	mV	70			TP4
Far-end ESMW (Eye Symmetry Mask Width)	UI		0.2		TP4
Far-end Eye Height, Differential	mV	30			TP4
Far-end Pre-cursor ISI Ratio	%	-4.5		2.5	TP4
DC Common Mode Voltage	mV	-350		2850	TP4	4

Note:

1.The location of TP1 , TP1a and TP4 are defined in IEEE 802 .3bs Figure 120 E–5 and Figure 120 E–6.

2.With the exception to IEEE 802 . 3bs 120 E .3. 1 .2 that the pattern is PRBS31Q or scrambled idle.

3.Meets BER specified in IEEE 802 .3bs 120E. 1. 1.

4.DC common mode voltage generated by the host. Specification includes effects of ground offset voltage .

Optical Characteristics

All performance is defined over the recommended operating environment unless otherwise specified.

Parameter	Unit	Min.	Typical	Max.	Note
Transmitter
Signaling Rate, each lane	GBd	26.5625 ± 100 ppm
Modulation Format		PAM4
TX Central Wavelength	nm	840	850	860
Spectral Width (RMS)	nm			0.6	1
Average Launch Power, each lane	dBm	-6.5		4
Outer Optical Modulation Amplitude ( OMAouter) , each lane	dBm	-4.5		3	2
Transmitter and Dispersion Eye Closure for PAM4 (TDECQ) , each lane	dB			4.5
TDECQ – 10 log10(Ceq)c , each lane	dB			4.5	3
Average Launch Power of OFF Transmitter, each lane	dBm			-30
Extinction Ratio, each lane	dB	3
Optical Return Loss Tolerance	dB			12
RIN12 OMA	dB/Hz			-128
Encircled Flux		>86% at 19 um <30% at 4.5 um			4
Receiver
Signaling Rate, each lane	GBd	26.5625 ± 100 ppm
Modulation Format		PAM4
RX Central Wavelength	nm	840	850	860
Damage Threshold	dBm	5			5
Average Receive Power, each lane	dBm	-8.4		4	6
Receive Power (OMAouter), each lane	dBm			3
Receiver Reflectance	dB			-12
Stressed Receiver Sensitivity (OMAouter)), each lane	dBm			-3.4	7
Receiver Sensitivity (OMAouter), each lane	dBm	Equation ( 138–1)			8
Conditions of Stressed Receiver Sensitivity Test:					9
Stressed Eye Closure for PAM4 ( SECQ) , lane under test	dB			4.5
SECQ – 10 log10(Ceq)f ( max) , lane under test	dB			4.5	3
OMAouter of Each Aggressor Lane	dBm			3
LOS Assert	dBm	-20
LOS De-Assert	dBm			-8
LOS Hysteresis	dB	0.5

Note:

1.RMS spectral width is the standard deviation of the spectrum.

2 .Even if the TDECQ <1 .4 dB, the OMA ( min) must exceed this value.

3.Ceq is a coefficient defined in IEEE802 . 3bs 121 .8.5.3 , which accounts for the reference equalizer noise enhancement.

4.If measured into type A1a .2 or type A1a .3 , or A1a .4 , 50 μm fiber, in accordance with IEC 61280-1-4.

5. The receiver shall be able to tolerate , without damage, continuous exposure to an optical input signal having this average power level on one lane. The receiver does not have to operate correctly at this input power.

6. Average receive power, each lane (min) is informative and not the principal indicator of signal strength. A received power below this value cannot be compliant; however, a value above this does not ensure compliance.

7 .Measured with conformance test signal at TP3 (see IEEE802 .3 cd-2018 138.8. 10) for the BER specified in 138.1.1.

8.Receiver sensitivity is informative and is defined for a transmitter with a value of SECQ up to 4.5 dB.RS = max(6.5 – SECQ–7.9) (dBm) Equation ( 138–1) where RS is the receiver sensitivity SECQ is the SECQ of the transmitter used to measure the receiver sensitivity The

normative requirement for receivers is stressed receiver sensitivity.

Figure1: Illustration of receiver sensitivity

9. These test conditions are for measuring stressed receiver sensitivity. They are not characteristics of the receiver.