F- tone公司专业研发制造40G QSFP+有源光缆、40G QSFP+ AOC, 切合MSA SFF-8436, 应用于40G以太网和InfiniBand等数据中心互联场景
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QSFP+ Active Optical Cable

Features

¨         Full duplex 4 channel 850nm parallel active optical cable          

¨         Transmission data rate up to 10.3Gbit/s per channel

¨         SFF-8436 QSFP+ compliant

¨         Hot pluggable electrical interface

¨         Differential AC-coupled high speed data interface

¨         4 channels 850nm VCSEL array

¨         4 channels PIN photo detector array

¨         Maximum link length of 300m on OM3 Multimode Fiber (MMF)and 400m on OM4 MMF

¨         Low power consumption <1.5W

¨         Operating case temperature 0°C to +70°C

¨         3.3V power supply voltage

¨         RoHS 6 compliant

Applications

¨         Infiniband transmission at 4ch SDR, DDR and QDR

¨         40GBASE-SR4 40G Ethernet

¨         Data Centers

Description

QSFP active optic cables are a high performance, low power consumption, long reach interconnect solution supporting 40G Ethernet, fiber channel and PCIe. It is compliant with the QSFP MSA and IEEE P802.3ba 40GBASE-SR4. F-tone QSFP AOC is an assembly of 4 full-duplex lanes, where each lane is capable of transmitting data at rates up to 10Gb/s, providing an aggregated rate of 40Gb/s.

AOC is one kind of parallel transceiver. VCSEL and PIN array package is key technique, through I2C system can contact with module.

Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Supply Voltage	Vcc	-0.3	3.6	V
Input Voltage	Vin	-0.3	Vcc+0.3	V
Storage Temperature	Tst	-20	85	?C
Case Operating Temperature	Top	0	70	?C
Humidity(non-condensing)	Rh	5	95	%

Recommended Operating Conditions

Parameter	Symbol	Min	Typical	Max	Unit
Supply Voltage	Vcc	3.13	3.3	3.47	V
Operating Case temperature	Tca	0		70	?C
Data Rate Per Lane	fd	2.5		10.3	Gbps
Humidity	Rh	5		85	%
Power Dissipation	Pm			1.5	W
Fiber Bend Radius	Rb	3			cm

Specifications

Parameter	Symbol	Min	Typical	Max	Unit
Differential input impedance	Zin	90	100	110	ohm
Differential Output impedance	Zout	90	100	110	ohm
Differential input voltage amplitude aAmplitude	ΔVin	300		1100	mVp-p
Differential output voltage amplitude	ΔVout	500		800	mVp-p
Skew	Sw			300	ps
Bit Error Rate	BR			E-12
Input Logic Level High	VIH	2.0		VCC	V
Input Logic Level Low	VIL	0		0.8	V
Output Logic Level High	VOH	VCC-0.5		VCC	V
Output Logic Level Low	VOL	0		0.4	V

Note：

1. BER=10^-12; PRBS 2^31-1@10.3125Gbps.

2.   Differential input voltage amplitude is measured between TxnP and TxnN

3.   Differential output voltage amplitude is measured between RxNP and RxnN

Optical Characteristics

Parameter	Symbol	Min	Typical	Max	Unit	Notes
Transmitter
Centre Wavelength	λc	840	850	860	nm	-
RMS spectral width	?λ	-	-	0.65	nm	-
Average launch power, each lane	Pout	-7.5	-	2.5	dBm	-
Difference in launch power between any two lanes (OMA)				4	dB	-
Extinction Ratio	ER	3	-	-	dB	-
Peak power, each lane				4	dBm	-
ransmitter and dispersion penalty (TDP), each lane	TDP			3.5	dB	-
Average launch power of OFF transmitter, each lane				-30	dB	-
Eye Mask coordinates:    X1, X2, X3, Y1, Y2, Y3	SPECIFICATION VALUES 0.23, 0.34, 0.43, 0.27, 0.35, 0.4						Hit Ratio = 5x10-5
Receiver
Centre Wavelength	λc	840	850	860	nm	-
Stressed receiver sensitivity in OMA, each lane				-5.4	dBm	1
Maximum Average power at receiver input, each lane				2.4	dBm	-
Receiver Reflectance				-12	dB	-
Peak power, each lane				4	dBm	-
LOS Assert		-30			dBm	-
LOS De-Assert – OMA				-7.5	dBm	-
LOS Hysteresis		0.5			dB	-

Note：

1．Measured with conformance test signal at TP3 for BER = 10e-12

Pin Descriptions

Pin	Logic	Symbol	Name/Description	Ref.
1		GND	Module Ground	1
2	CML-I	Tx2-	Transmitter inverted data input
3	CML-I	Tx2+	Transmitter non-inverted data input
4		GND	Module Ground	1
5	CML-I	Tx4-	Transmitter inverted data input
6	CML-I	Tx4+	Transmitter non-inverted data input
7		GND	Module Ground	1
8	LVTTL-I	MODSEIL	Module Select	2
9	LVTTL-I	ResetL	Module Reset	2
10		VCCRx	+3.3v Receiver Power Supply
11	LVCMOS-I	SCL	2-wire Serial interface clock	2
12	LVCMOS-I/O	SDA	2-wire Serial interface data	2
13		GND	Module Ground	1
14	CML-O	RX3+	Receiver non-inverted data output
15	CML-O	RX3-	Receiver inverted data output
16		GND	Module Ground	1
17	CML-O	RX1+	Receiver non-inverted data output
18	CML-O	RX1-	Receiver inverted data output
19		GND	Module Ground	1
20		GND	Module Ground	1
21	CML-O	RX2-	Receiver inverted data output
22	CML-O	RX2+	Receiver non-inverted data output
23		GND	Module Ground	1
24	CML-O	RX4-	Receiver inverted data output
25	CML-O	RX4+	Receiver non-inverted data output
26		GND	Module Ground	1
27	LVTTL-O	ModPrsL	Module Present, internal pulled down to GND
28	LVTTL-O	IntL	Interrupt output, should be pulled up on host board	2
29		VCCTx	+3.3v Transmitter Power Supply
30		VCC1	+3.3v Power Supply
31	LVTTL-I	LPMode	Low Power Mode	2
32		GND	Module Ground	1
33	CML-I	Tx3+	Transmitter non-inverted data input
34	CML-I	Tx3-	Transmitter inverted data input
35		GND	Module Ground	1
36	CML-I	Tx1+	Transmitter non-inverted data input
37	CML-I	Tx1-	Transmitter inverted data input
38		GND	Module Ground	1

Notes:

1. Module circuit ground is isolated from module chassis ground within the module.

2. Open collector; should be pulled up with 4.7k – 10k ohms on host board to a voltage between 3.15Vand 3.6V.

ModSelL Pin

The ModSelL is an input pin. When held low by the host, the module responds to 2-wire serial communication

commands. The ModSelL allows the use of multiple QSFP modules on a single 2-wire interface bus. When

the ModSelL is “High”, the module will not respond to any 2-wire interface communication from the host.

ModSelL has an internal pull-up in the module.

ResetL Pin

Reset. LPMode_Reset has an internal pull-up in the module. A low level on the ResetL pin for longer than the

minimum pulse length (t_Reset_init) initiates a complete module reset, returning all user module settings to

their default state. Module Reset Assert Time (t_init) starts on the rising edge after the low level on the

ResetL pin is released. During the execution of a reset (t_init) the host shall disregard all status bits until the

module indicates a completion of the reset interrupt. The module indicates this by posting an IntL signal with

the Data_Not_Ready bit negated. Note that on power up (including hot insertion) the module will post this

completion of reset interrupt without requiring a reset.

LPMode Pin

F-tone QSFP AOC operate in the low power mode (less than 1.5 W power consumption)

This pin active high will decrease power consumption to less than 1W.

ModPrsL Pin

ModPrsL is pulled up to Vcc on the host board and grounded in the module. The ModPrsL is asserted “Low”

when the module is inserted and deasserted “High” when the module is physically absent from the host connector.

IntL Pin

IntL is an output pin. When “Low”, it indicates a possible module operational fault or a status critical to the

host system. The host identifies the source of the interrupt by using the 2-wire serial interface. The IntL pin is

an open collector output and must be pulled up to Vcc on the host board.

DIAGNOSTIC MONITORING INTERFACE

Digital diagnostics monitoring function is available on all F-tone QSFP AOCs. A 2-wire serial interface

provides user to contact with module.

The structure of the memory is shown in Figure 4. The memory space is arranged into a lower, single page, address space of 128 bytes and multiple upper address space pages. This structure permits timely access to addresses in the lower page, such as Interrupt Flags and Monitors. Less time critical time entries, such as serial ID information and threshold settings, are available with the Page Select function.

The interface address used is A0xh and is mainly used for time critical data like interrupt handling in order to enable a one-time-read for all data related to an interrupt situation. After an interrupt, IntL, has been asserted, the host can read out the flag field to determine the affected channel and type of flag.

Page02 is User EEPROM and its format decided by user.

The detail description of low memory and page00.page03 upper memory please see SFF-8436 document.

Timing for Soft Control and Status Functions

Note：

1. Power on is defined as the instant when supply voltages reach and remain at or above the minimum specified value.

2. Fully functional is defined as IntL asserted due to data not ready bit, bit 0 byte 2 deasserted.

3. Measured from falling clock edge after stop bit of read transaction.

4. Measured from falling clock edge after stop bit of write transaction.

Figure8.Timing Specifications

Mechanical Dimensions

Figure9.Mechanical Specifications

Ordering information

Part Number	Product Description
QSFP-40GAOC-XXX	XXX=different cable lengths on OM3 Multimode Fiber (MMF)

XX(X)	Cable Length on OM3 Multimode Fiber (MMF)
03	003=3m
05	005=5m
10	010=10m
20	020=20m
50	050=50m
300	300=300m

References

1. SFF-8436 QSFP+

2. Infiniband IB-4x-SX, IB-4x-DDR-SX, IB-4x-QDR-SX

3. Ethernet 40GBASE-SR4