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        EPON OLT MODULE
        Date:2018-10-18 14:11:42 | Visits:


        1. GENERAL DESCRIPTION

        This 1490nm DFB  EPON OLT SFP transceiver is designed to transmit and receive optical data over single mode optical fiber for link length 20km.  

        The transmitter input and receiver output impedance is 100 Ohms differential.  Data lines are internally AC coupled.  The module provides differential termination and reduce differential to common mode conversion for quality signal termination and low EMI.  

        The transmitter converts 1.25Gbit/s serial CML electrical data into serial optical data compliant with the 10GBASE-LR standard.  An open collector compatible Transmit Disable (Tx_Dis) is provided.  A logic “1,” or no connection on this pin will disable the laser from transmitting.  A logic “0” on this pin provides normal operation.  The transmitter has an internal automatic power control loop (APC) to ensure constant optical power output across supply voltage and temperature variations.  An open collector compatible Transmit Fault (TFault) is provided.  TX_Fault is a module output contact that when high, indicates that the module transmitter has detected a fault condition related to laser operation or safety.  The TX_Fault output contact is an open drain/collector and shall be pulled up to the Vcc_Host in the host with a resistor in the range 4.7-10 kΩ.   TX_Disable is a module input contact. When TX_Disable is asserted high or left open, the SFP+ module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor

        The receiver converts 1.25Gbit/s serial optical data into serial PECL electrical data.  An open collector compatible Loss of Signal is provided.  Rx_LOS when high indicates an optical signal level below that specified in the relevant standard.  The Rx_LOS contact is an open drain/collector output and shall be pulled up to Vcc_Host in the host with a resistor in the range 4.7-10 kΩ, or with an active termination.  Power supply filtering is recommended for both the transmitter and receiver.   The Rx_LOS signal is intended as a preliminary indication to the system in which the SFP is installed that the received signal strength is below the specified range. Such an indication typically points to non-installed cables, broken cables, or a disabled, failing or a powered off transmitter at the far end of the cable.

         

        Features

         

        l 1.25Gb/s serial optical interface compliant to 802.3AH  specifications  small form factor pluggable module “SFP”

        l 1490 nm DFB  transmitter, 1310 nm APD  photo-detector BURST receiver

        l 2-wire interface for management specifications compliant with SFF 8472 digital diagnostic monitoring interface for optical transceivers

        l Operating case temperature: 0 to 70 °C or-40 to 85 °C

        l All-metal housing for superior EMI performance

        l Low power consumption

        l Cost effective OLT solution,

        l RoHS compliant


        Applications

         

        · GEPON  networks

        · FTTX

        2. PROPOSED APPLICATION SCHEMATICS

         

         

         

         

        3. PIN DEFINITION

        The SFP modules are hot-pluggable.  Hot pluggable refers to plugging in or unplugging a module while the host board is powered.  The SFP host connector is a 0.8 mm pitch 20 position right angle improved connector specified by SFF-8083, or stacked connector with equivalent with equivalent electrical performance.   Host PCB contact assignment is shown in Figure 2 and contact definitions are given in Table 2.   SFP module contacts mates with the host in the order of ground, power, followed by signal as illustrated by Figure 3 and the contact sequence order listed in Table 2.

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

        PIN

        Logic

        Symbol

        Name / Description

        Note

        1

         

        VeeT

        Module Transmitter Ground

        1

        2

        LVTTL-O

        TX_Fault

        Module Transmitter Fault

         

        3

        LVTTL-I

        TX_Dis

        Transmitter Disable; Turns off transmitter laser output

         

        4

        LVTTL-I/O

        SDA

        2-Wire Serial Interface Data Line

        2

        5

        LVTTL-I

        SCL

        2-Wire Serial Interface Clock

        2

        6

         

        MOD_DEF0

        Module Definition, Grounded in the module

         

        7

        LVTTL-I

        RS0

        Receiver Rate Select

         

        8

        LVTTL-O

        RX_LOS

        Receiver Loss of Signal Indication Active LOW

         

        9

        LVTTL-I

        RS1

        Transmitter Rate Select (not used)

         

        10

         

        VeeR

        Module Receiver Ground

        1

        11

         

        VeeR

        Module Receiver Ground

        1

        12

        LVPECL-O

        RD-

        Receiver Inverted Data Output

         

        13

        LVPECL-O

        RD+

        Receiver Data Output

         

        14

         

        VeeR

        Module Receiver Ground

        1

        15

         

        VccR

        Module Receiver 3.3 V Supply

         

        16

         

        VccT

        Module Receiver 3.3 V Supply

         

        17

         

        VeeT

        Module Transmitter Ground

        1

        18

        CML-I

        TD+

        Transmitter Non-Inverted Data Input

         

        19

        CML-I

        TD-

        Transmitter Inverted Data Input

         

        20

         

        VeeT

        Module Transmitter Ground

        1

        Table 2: OLT SFP Module PIN Definition

        Note:

        1. Module ground pins GND are isolated from the module case.

        2. Shall be pulled up with 4.7K-10Kohms to a voltage between 3.15V and 3.45V on the host board.

         

        4. TRANSCEIVER BLOCK DIAGRAM

         

         

         

         

         

         

         

         

         

         

         

        5. ABSOLUTE MAXIMUM RATING

        These values represent the damage threshold of the module.  Stress in excess of any of the individual Absolute Maximum Ratings can cause immediate catastrophic damage to the module even if all other parameters are within Recommended Operating Conditions.

         

        Parameters

        Symbol

        Min.

        Max.

        Unit

        Power Supply Voltage

        VCC

        0

        3.6

        V

        Storage Temperature

        Tc

        -40

        85

        °C

         

        Operating Case Temperature

        Tc

        0

        70

         

        °C

        TI

        -40

        85

        Relative Humidity

        RH

        5

        95

        %

        RX Input Average Power

        Pmax

        -

        -7

        dBm

         

         

         

        6. RECOMMENDED OPERATING ENVIRONMENT

        Recommended Operating Environment specifies parameters for which the electrical and optical characteristics hold unless otherwise noted.

         

        Parameters

        Symbol

        Min.

        Typical

        Max

        Unit

        Power Supply Voltage

        VCC

        3.135

        3.3

        3.465

        V

        Power Supply Current

        Icc

         

         

        350

        mA

        Operating Case Temperature

        TC

        0

        25

        70

        °C

        TI

        -40

        25

        85

         

        Table 4: Recommended Operating Environment

         

         

         

        7. OPTICAL CHARACTERISTICS

        The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

         

        Parameters

        Unit

        Values

        Operating Reach

        m

        2 - 20K

        Transmitter

        Center wavelength

        nm

        1490

        Side Mode Suppression Ratio (min)

        dB

        30

        Launched power

                  – maximum (Average)

        dBm

        9

                  – minimum (Average)

        dBm

        7

        Average launch power of OFF transmitter (max)

        dBm

        -30

        Extinction ratio (min)

        dB

        9

        Optical Return Loss Tolerance (min)

        dB

        12

        Receiver

        Center wavelength (range)

        nm

        1310

        Receive overload (max) in average power(note 1)

        dBm

        -8

        Receive sensitivity (min) in average power(note 1)

        dBm

        -32

        Receiver Reflectance (max)

        dB

        -12

        Los Assert(min)

        dBm

        -33

        Los Dessert(max)

        dBm

                -30

        Los Hysteresis(min)

        dB

        0.5

        Receiver power (damage, Max)

        dBm

        -7

         

        Notes:

        1. Average optical power shall be measured using the methods specified in TIA/EIA-455-95.

         

         

        2. Power budget is defined as the different between the Rx sensitivity and the Tx output power of the interface.

         

         

        Table 5: Optical Characteristics

         

        8. DITITAL DIAGNOSTIC FUNCTIONS

        The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified. It is compliant to SFF8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales stuff.

         

        Parameter

        Symbol

        Min.

        Max

        Unit

        Notes

        Temperature monitor absolute error

        DMI_Temp

        -3

        3

        degC

        Over operating temp

        Laser power monitor absolute error

        DMI_TX

        -3

        3

        dB

         

        Supply voltage monitor absolute error

        DMI_VCC

        -0.08

        0.08

        V

        Full operating range

        Bias current monitor

        DMI_Ibias

        -10%

        10%

        mA

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

         

        9. ELECTRICAL CHARACTERISTICS

        The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

        Parameter

        Symbol

        Min.

        Typical

        Max

        Unit

        Notes

        Data Rate

         

        -

        1.25

        -

        Gbps

         

        Power Consumption

         

        -

        800

        1000

        mW

         

        Transmitter

        Single Ended Output Voltage Tolerance

         

        -0.3

        -

        4

        V

         

        Common mode voltage tolerance

         

        15

        -

        -

        mV

         

        Tx Input Diff Voltage

        VI

        180

         

        1200

        mV

         

        Tx Fault

        VoL

        -0.3

         

        0.4

        V

        At 0.7mA

        Data Dependent Input Jitter

        DDJ

         

         

        0.1

        UI

         

        Data Input Total Jitter

        TJ

         

         

        0.28

        UI

         

        Receiver

        Single Ended Output Voltage Tolerance

         

        -0.3

        -

        4

        V

         

        Rx Output Diff Voltage

        Vo

        300

         

        1000

        mV

         

        LOS Assert Time

        TAssert

        -

        -

        500

        ns

        LOS Assert Time   

        LOS De-assert Time

        TDeassert

        -

        -

        500

        ns

        LOS De-assert Time  

        Receiver Threshold Settling Time

        TSETTLING

         

         

        250

        ns

        Figure 3

         

         

         

         

         

         

         

        10. Burst Mode Receiver Dynamic Range

         

         

         

         

         

         

         

         

         

         

         

         

        11.Timing Parameter Definitions in Burst Mode Sequence

         

         

         

        Figure 3 Timing Parameter Definitions in Burst Mode Sequence

         

         

         

         

         

         

         

         

         

        12. MECHANICAL

         

         

         

         

        Table 10: Key Mechanical Dimensions

         

        13. ESD

         

        This transceiver is specified as ESD threshold 2kV for all electrical input pins, tested per MIL-STD-883, Method 3015.4 /JESD22-A114-A (HBM).  However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.   

         

         

        14. LASER SAFTY

         

        This is a Class 1 Laser Product according to IEC 60825-1:1993:+A1:1997+A2:2001.  This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (July 26, 2001)

         

         

         

         

         

         

         

         

        14.  Order Information

         

        D

        ET

        2

        -

        49

        24

        -

        2

        C

        Y

        2

        +++

         

         

         

         

         

         

        ODI

         

         

         

         

         

         

        EPON

        OLT

         

         

         

        single Fiber

         

         

         

         

         

         

        -

         

         

        27

        Tx:1270

         DFB

         

         

         

         

         

        1.25

        GBPs

         

         

         

         

         

         

        -

         

        Distance

        0:2km

        1:10km

        2: 20km

        4:40km

         

         

         

         

        C

         

        0~+70

        °C

        Y

        With

        DDMI

         

         

        1

         

         

        LC/PC

         

         

         

         

         

         

        Customer

        Information

         

         

        33

        Tx:1330

         

        DFB

         

         

        E

         

        -20~+85

        °C

        N: Without

        DDMI

         

         

        2

         

         

        SC/PC

         

         

        49

         

        1490DFB

         

         

        I

         

        -40~+85

        °C

         

         

        -

         

         

        3

         

         

        SC/APC

         

         

        Revision  History:                                                                               Rev. 0.0

        Previous  Version:            

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