Ascent Communication Technology

100G QSFP28 SR01 BIDI MMF 850nm 100m

Ascent’s QSFP28 100G SR BIDI is a parallel Quad Small Form-factor Pluggable (QSFP28) Bi-Direction optical module which can support 100Gb/s bit rates in an optical communication application compliant to SFF-8636 standards. The module integrates four host electrical data into two optical lanes (by Dual Wavelength VCSEL Bi-Directional Optical Interface, 850nm and 900nm) to allow optical communication over a 2-fiber duplex LC optical multi-mode fiber. Reversely, on the receiver side, the module de-multiplexes 2 sets of optical input signal and converts them to 4 channels of electrical data. An optical fiber ribbon cable with an LC connector can be plugged into the QSFP28 module receptacle. Proper alignment is ensured by the guide pins inside the receptacle. The cable usually cannot be twisted for proper channel to channel alignment. Electrical connection is achieved through an MSA-compliant 38-pin edge type connector. The product is designed with form factor, optical/electrical connection, and digital diagnostic interface according to the QSFP+ Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity, and EMI interference.

· QSFP28 MSA Specification Compliant, including new functions per SFF-8636

· 100G Link Distances up to 70m over OM3,100m over OM4

· Hot Pluggable

· Dual Wavelength VCSEL Bi-Directional Optical Interface, PAM4 2x50Gbps 850nm/908nm

· Interface with Digital monitoring and maskable Interrupts for Ex-panded functionality

· Case Operating Temperature:

Range: 0 to 70°C

· RoHS II Compliance

· Operating Mode

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit	Notes
Storage Ambient Temperature	Tstg	-40	+85	°C
Relative Humidity - Storage	RHS	0	95	%
Relative Humidity - Operating	RHO	0	85	%
Module Supply Voltage	V_CC	-0.5	3.6	V

Notes:
1. Exceeding the Absolute Maximum Ratings may cause irreversible damage to the device. The device is not intended to be operated under the condition of simulta-neous Absolute Maximum Ratings, a condition which may
cause irreversible damage to the device. RH is Non-condensing condition.

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Case Operating Temperature	Tcase	0	+25	+70	°C
Module Supply Voltage	VCC	3.135	3.3	3.465	V
Signaling Speed Per Electrical Channel(4x25G NRZ)	S	-	25.78	-	Gb/s
Power Consumption	P	-	-	4	W

Electrical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Transmitter
Tx_Data Differential Input Voltage	VIN	200	-	900	mV
Tx_Data Differential Input Impedance	ZIN	-	100	-	Ω
Receiver
Rx_Data Differential Output Voltage	VOUT	-	-	1200	mV
Rx_Data Differential Output Impedance	ZOUT	-	100	-	Ω
Timing Requirement of Control and Status I/O
Tx Squelch Deassert Time	toff_Txsq	-	-	1	s
Rx Squelch Deassert Time	toff_Rxsq	-	-	2	s
Non-Volatile Memory Specification
Complete Single or Sequential Write	twr	-	-	80	ms
Soft Control and Status Timing Requirements
Application or Rate Select Change Time	t_ratesel	-	-	600	ms

100G Transmitter &Receiver Optical Characteristics

Parameter Transmitter	Symbol	Test Point	Min.	Typ.	Max.	Unit	Notes
Average Launch Power ,each Lane	POUT	TP2	-6.2	-	4	dBm	Average Optical Output
Optical modulation Amplitude , each Lane	OMA	TP2	-4.2	-	3	dBm
Extinction Ratio	ER	TP2	3	-	-	dB
Launch power in OMAouter Minus TDECQ, each Lane	OMA- TDECQ	TP2	-5.9	-	-	dB
Optical Output with Tx OFF	POFF	TP2	-	-	-30	dBm
Center Wavelength 1	λ	TP2	844	850	863	nm
Center Wavelength 2	λ	TP2	900	908	918	nm
RMS Spectral Width1	Δλ	TP2	-	-	0.6	nm
RMS Spectral Width2	Δλ	TP2	-	-	0.65	nm
Optical Return Loss Tolerance	ORL	TP2	-	-	12	dB
Transmitter and Dispersion Eye Closure for PAM4 (TDECQ), each Lane	TDECQ	TP2			4.9	dB
Receiver
Average Power at Receive Input, each Lane	PIN	TP3	-7.9	-	4	dBm	Note1
Receive Power, each Lane (OMAouter)	PIN(OMA)	TP3	-5.9	-	3	dBm
Unstressed Receiver Sensitivity (OMAouter), each Lane	Sen	TP3	-	-	max(-6.6, SECQ - 8)	dBm	Note2
Center Wavelength1	λ	TP3	844	850	863	nm
Center Wavelength2	λ	TP3	900	908	918	nm
Receiver Reflectance	RFL	TP3	-	-	-12	dB
Rx_LOS of Signal - Assert	PA	TP3	-30	-	-	dBm
Rx_LOS of Signal - Deassert	PD	TP3	-	-	-5.9	dBm
Rx_LOS of Signal - Hysteresis	PHy	TP3	0.5	-	-	dB

Notes:
1. A received power below this value cannot be compliant; however, avalue above this does not ensure compliance.
2. Sensitivity where the BER=2.4E-4 measured with a PRBS 31Q test pattern@26.56GBaud.