Description
The F-tone Networks FTQ2-HG-SR4-OTU4 is a Four-Channel, Pluggable, Parallel, Fiber-Optic QSFP28 SR4 for 128G Fiber Channel and OTU4 Applications. This transceiver is a high performance module for short-range multi-lane data communication and interconnect applications. It integrates four data lanes in each direction with 112.2 Gbps bandwidth. Each lane can operate at 28.05Gbps up to 70 m using OM3 fiber or 100 m using OM4 fiber. These modules are designed to operate over multimode fiber systems using a nominal wavelength of 850nm. The electrical interface uses a 38 contact edge type connector. The optical interface uses an 12 fiber MTP (MPO) connector. This module incorporates F-tone Networks proven circuit and VCSEL technology to provide reliable long life, high performance, and consistent service.

Features
● 4 channels full-duplex transceiver modules
● Transmission data rate up to 28Gbps per channel for 128GFC/OTU4 application
● 4 channels 850nm VCSEL array
● 4 channels PIN photo detector array
● Internal CDR circuits on both receiver and transmitter channels
● Support CDR bypass
● Low power consumption <2.0W
● Hot Pluggable QSFP form factor
● Maximum link length of 70m on OM3 Multimode Fiber (MMF)and 100m on OM4 MMF
● Single MPO connector receptacle
● Operating case temperature 0°C to +70°C
● 3.3V power supply voltage
● RoHS 6 compliant(lead free)

Applications
● OTU4/128GFC

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

ºC

Case Operating Temperature

Top

0

70

ºC

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

ºC

Data Rate Per Lane

fd

28.05

Gbps

Humidity

Rh

5

85

%

Power Dissipation

Pm

2.0

W

Fiber Bend Radius

Rb

3

cm

Electrical 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  

ΔVin

300

1100

mVp-p

Differential output voltage amplitude

ΔVout

500

800

mVp-p

Skew

Sw

300

ps

Bit Error Rate

BER

5E-5

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：
2.   Differential input voltage amplitude is measured between TxnP and TxnN.
3.   Differential output voltage amplitude is measured between RxnP and RxnN.

Optical Characteristics 
Table 3 - Optical Characteristics 

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter

Centre Wavelength

λc

840

850

860

nm

-

RMS spectral width

∆λ

-

-

0.6

nm

-

Average launch power, each lane

Pout

-8.4

-

2.4

dBm

-

Optical Modulation Amplitude

(OMA),each lane

OMA

-6.4

3

dBm

-

Transmitter and dispersion eye closure(TDEC),each lane

TDEC

4.3

dB

Extinction Ratio

ER

3

-

-

dB

-

Average launch power of OFF transmitter, each lane

-30

dB

-

Eye Mask coordinates:

   X1, X2, X3, Y1, Y2, Y3

SPECIFICATION VALUES

{0.3,0.38,0.45,0.35,0.41.0.5}

Hit Ratio = 5x10-5

Receiver

Centre Wavelength

λc

840

850

860

nm

-

Receiver sensitivity in OMA（32GFC,28.05Gbps.）

-5.2

dBm

1

Receiver sensitivity in OMA

（OTU4,27.95Gbps.）

-5.2

dBm

2

Maximum Average power at receiver , each lane

input, each lane

2.4

dBm

-

Minimum Average power at receiver , each lane

-10.3

dBm

Receiver Reflectance

-12

dB

-

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=5E-5@32GFC,28.05Gbps.
2．Measured with conformance test signal at TP3 for BER=1E-6@OTU4, 27.95Gbps

Mechanical Dimensions44

Ordering information

Part Number

Product Description

FTQ2-HG-SR4-OTU4

QSFP28, 128GFC, 70m on OM3 Multimode Fiber (MMF)and 100m on OM4 MMF

 

 

 

 

 

 

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Important Notice

Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by F-tone Networks before they become applicable to any particular order or contract. In accordance with the F-tone Networks policy of continuous improvement specifications may change without notice.

The publication of information in this data sheet does not imply freedom from patent or other protective rights of F-tone Networks or others. Further details are available from any F-tone Networks sales representative.