50G SFP56 LR Transceiver
GSS-SPO500-LR1CZFeaturesHot-pluggable SFP28 form factorMaximum link length of 10km



Full-duplex transceiver module

Up to 53.125Gbps (26.5625GBd PAM4)

53.125Gbps PAM4 based on a cooled EML TOSA transmitter

53.125Gbps PAM4 PIN Receiver

Duplex LC receptacleSingle 3.3V power supplyPower dissipation < 3W



RoHS compliant (lead free)Operating case temperature range: 0℃ to 70℃

Applications
IEEE 802.3cd 50GBASE-LR

Other Optical LinkDescription
The Gigalight Technologies GSS-SPO500-LR1CZ is a single-Channel, Pluggable, Fiber-Optic SFP56for 26.5625GBd PAM4 Ethernet Applications. It is a high performance module for short-range data
communication and interconnect applications which operate at 53.125 Gbps up to 10km. This module
is designed to operate over single mode fiber systems using a nominal wavelength of 1311nm. The
electrical interface uses a 20 contact edge type connector. The optical interface uses duplex LC
receptacle. This module incorporates Gigalight Technologies proven circuit and technology to provide
reliable long life, high performance, and consistent service.

28-Mar-2022 Rev. 01Block Diagram

Absolute Maximum Ratings
Parameter

SymbolMinMax

Unit

Supply Voltage

Vcc

03.6

V

Storage Temperature

Ts-40+85℃

Operating Humidity-585%

28-Mar-2022 Rev. 02

Recommended Operating Conditions
Parameter

SymbolMin

Operating Case Temperature

Tc

0Power Supply Voltage

Vcc

3.13

Power Dissipation

Pm

Typical

3.3

Max

Unit

+70℃

3.47

V

3W

Electrical Specifications
Parameter

SymbolMin

TypicalMax

Unit

Differential Input ImpedanceZin

90100110ohm

Differential Output ImpedanceZout

90100110ohm

Differential Input Voltage Amplitude1ΔVin900mVp-p

Differential Output Voltage Amplitude2

ΔVout

900

mVp-p

Input Logic Level HighVIH

2.0

Vcc

V

Input Logic Level Low

VIL

00.8

V

Output Logic Level High

VOH

Vcc-0.5

Vcc

V

Output Logic Level Low

VOL

00.4

V

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

Optical Characteristics
Parameter

SymbolMin

TypicalMax

Unit

Notes

Transmitter
Centre Wavelength

λc1304.5-1317.5

nm-Side-mode suppression ratio

SMSR30--dB-

Average launch power

Pout-4.5-

4.2dBm-

28-Mar-2022 Rev. 03Parameter
Optical Modulation Amplitude(OMA outer)Transmitter and dispersion eyeclosure(TDEC)
Extinction Ratio

SymbolMin

TypicalMax

Unit

Notes

OMA-1.5-

4dBm

-

TDEC-

-

3.2

dBER

3.5-

-dB-

-30dB-

Average launch power of OFFtransmitter--

ReceiverCentre Wavelength

λc1304.5-1317.5nm-

Receiver Sensitivity in OMA outerRXsen--11-8.4dBm

1

Average receive power

Pin-10.8-4.2dBm-

Receiver Reflectance---26

dB-

LOS Assert--16-dBm-

LOS De-Assert-

-14-

dBm

-

LOS Hysteresis

0.5--dB-

Note:
1、Measured with conformance test signal at TP3 for BER = 2.4E-4 Pre-FECs

DIAGNOSTIC MONITORING INTERFACE (OPTIONAL)
The following digital diagnostic characteristics are defined over the normal operating conditions unlessotherwise specified.
Parameter

SymbolMinMax

Units

Notes

Temperature monitor
absolute error

DMI_Temp-3+3degC

Over operating
temperature range

Supply voltage monitor
absolute error

DMI _VCC-0.1

0.1

VOver full operating
range

Channel RX power monitor
absolute error

DMI_RX_Ch-22dB

128-Mar-2022 Rev. 04

ParameterSymbolMinMax

Units

Channel Bias currentmonitor

DMI_Ibias_Ch-10%

10%mA

Channel TX power monitor
absolute error

DMI_TX_Ch-2

2dB

Notes

1Notes:1、Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB
fluctuation, or a +/- 3 dB total accuracy.
The transceivers provide serial ID memory contents and diagnostic information about the present
operating conditions by the 2-wire serial interface (SCL, SDA). The memory map specific data fielddefines as following.

Pin Definitions

28-Mar-2022 Rev. 05

Pin Descriptions
PINLogic

1SymbolName / Description

NoteVeeT

Module Transmitter Ground122

LVTTL-O

TX_Fault

Module Transmitter Fault

3

LVTTL-I

TX_DisTransmitter Disable; Turns off transmitter
laser output

4

LVTTL-I/O

SDA

2-Wire Serial Interface Data Line

25

LVTTL-I

SCL

2-Wire Serial Interface Clock

2MOD_ABS

Module Definition, Grounded in the module

RS0Receiver Rate Select

67LVTTL-I

28-Mar-2022 Rev. 06PIN

LogicSymbol

Name / Description

8LVTTL-O

RX_LOS

Receiver Loss of Signal Indication Active
LOW

9LVTTL-I

RS1Transmitter Rate Select (not used)

10VeeR

Module Receiver Ground

111VeeR

Module Receiver Ground

1

12CML-O

RD-Receiver Inverted Data Output

13CML-O

RD+Receiver Data Output

14VeeR

Module Receiver Ground

15VccR

Module Receiver 3.3 V Supply

16VccT

Module Receiver 3.3 V Supply

17VeeT

Module Transmitter Ground

18

CML-I

TD+Transmitter Non-Inverted Data Input

19CML-I

TD-Transmitter Inverted Data Input

VeeT

Module Transmitter Ground

20Note111Notes:
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.

28-Mar-2022 Rev. 07

Recommended Interface Circuit

28-Mar-2022 Rev. 08

Mechanical Dimensions

Regulatory Compliance
Gigalight GSS-SPO500-LR1CZ transceivers are Class 1 Laser Products. They meet the requirementsof the following standards:
FeatureLaser Safety

Electrical Safety
Environmental protection

28-Mar-2022 Rev. 0Standard
IEC 60825-1:2014 (3rd Edition)
IEC 60825-2:2004/AMD2:2010
EN 60825-1-2014
EN 60825-2:2004+A1+A2
EN 62368-1: 2014
IEC 62368-1:2014
UL 62368-1:2014
Directive 2011/65/EU withamendment(EU)2015/863

9Feature
CE EMC

FCC

Standard
EN55032：2015
EN55035：2017
EN61000-3-2:2014
EN61000-3-3:2013
FCC Part 15, Subpart B; ANSI C63.4-2014

References
1. SFP-8472 V12.3
2. SFP-8431
3. IEEE 802.3cd 50GBASE-LR
4. OIF CEI-56G-VSR-PAM4

CAUTION:Use of controls or adjustment or performance of procedures other than those specified herein may
result in hazardous radiation exposure.

Ordering information
Part Number

Product Description

GSS-SPO500-LR1CZ

53Gbps, 1311nm, SMF, 10km, 0℃ ~ +70℃

Important Notice
Performance figures, data and any illustrative material provided in this data sheet are typical and mustbe specifically confirmed in writing by Gigalight before they become applicable to any particular order
or contract. In accordance with the Gigalight policy of continuous improvement specifications maychange without notice.
The publication of information in this data sheet does not imply freedom from patent or other protectiverights of Gigalight or others. Further details are available from any Gigalight sales representative.
E-mail: sales@gigalight.com
28-Mar-2022 Rev. 010

Official Site: www.gigalight.com

Revision History
RevisionV0Date
Mar-28-2022

28-Mar-2022 Rev. 0Description
Advance Release.

11