800G-PSM8
Technical Specification
Draft 1.0

August 28, 2020

Chair – Wang Chen, China Telecommunication Technology Labs
Spokesperson- Maxim Kuschnerov, Huawei
Editor – Zhang Lewei, Huawei
Secretary – Zhang Hua, Hisense Broadband
The following companies were members of the 800G Pluggable MSA at the release of thisSpecification:
Promoters
Accelink
AOI
BAIDU
CIG
CTTL
Fujitsu
H3C
HisenseHuawei
Inphi
LumentumLuxshare
Sumitomo
Tencent
Yamaichi Electronics

Contributors
Antirsu
CentecCommscope
Credo
Eoptolink Technology Inc.
FOIT
Fiberhome
HGTECH
Hisilicon
Innolight
Keysight
LinktelMarvell
Maxlinear
NeoPhotonics
SemtechSiFotonics
Sitrus Technology
SONT
Source Photonics
Tektronix
USCONEC
Viavi
ZTE
II-VI

8x100G-PSM8 Technical Specification Draft 1.0

Revisions
Rev
1.0

Date

Description
Initial Release

8x100G-PSM8 Technical Specification Draft 1.0

TABLES
Table 2-1: Wavelength-division-multiplexed lane assignments………………………………………………….6
Table 2-2: 8x100G-PSM8 operating range………………………………….………………………………………………6
Table 2-3: 8x100G-PSM8 transmit characteristics…………………………..…………….………………..…………7
Table 2-4: 8x100G-PSM8 receive characteristics…………………………………………………….…..…………….8
Table 2-5: 8x100G-PSM8 illustrative power budget……………………………………………………………..….10
Table 2-6: 8x100G-PSM8 Maximum value for each discrete reflectance………………………………….10
Table 3-1: Test patterns………………………………………………………………………………………………..…………11
Table 3-2: Test pattern definitions and related subclauses………………………………………………………11
Table 3-3: Transmitter compliance channel specifications……………………………………………………….13
Table 4-1: Fiber optic cabling (channel) characteristics………………………………………………….………..15
Table 5-1: Optical fiber and cable characteristics…………………………………………………………………….16
Table 6-1: 8x100G-PSM8 Module Color Coding……………………………………………………………..………..17

FIGURES
Figure 1-1: Block diagram for 8x100G-PSM8 transmit/receive paths…………………………….…………. 4
Figure 2-1: Illustration of receiver sensitivity mask for 8x100G-PSM8………………………….…………… 6
Figure 4-1: Fiber optic cabling model…………………………………………………………………………………..…..15

8x100G-PSM8 Technical Specification Draft 1.0

1 GENERAL
1.1 SCOPE
This Multi-Source Agreement (MSA) defines 8 x 100 Gbps Parallel Single Mode (PSM) opticalinterface for 800 Gbps optical transceivers for Ethernet applications. Forward error correction(FEC) is required to be implemented by the host in order to ensure reliable system operation.
Two transceivers communicate over single mode fibers (SMF) of length from 2 meters to atleast 100 meters. The transceiver electrical interface is not specified by this MSA but can have,for example, eight lanes in each direction with a nominal signaling rate of 106.25 Gbps per lane.
A variety of form factors for the 8x100G-PSM8 transceivers are possible and none areprecluded by this MSA.
Note: The descriptions marked in red in the following sections represent the points underdiscussion.

1.2 8x100G-PSM8 MODULE BLOCK DIAGRAM

Figure 1-1: Block diagram for 8x100G-PSM8 transmit/receive paths

8x100G-PSM8 Technical Specification Draft 1.0

1.3 FUNCTIONAL DESCRIPTION
8x100G-PSM8 transceivers comply with the requirements of this document and have thefollowing common features: eight optical transmitters; eight optical receivers with signal detect;
MPO connectors for single mode fiber. The optical connector type is vendor specific but MPO
16 is preferred which should follow the standard in the respective connector MSAs.

1.4 HARDWARE SIGNALING PINS
Hardware signaling pins are specified in the respective module form factor MSAs.

1.5 MODULE MANAGEMENT INTERFACE
The contents of the various ID registers shall comply with the requirements of the module MSA
and the respective standards.

1.6 HIGH SPEED ELECTRICAL CHARACTERISTICS
The detailed high speed electrical characteristics are not defined by this MSA. 800G transceivers
should be implemented in compliance with applicable electrical interface specifications.

1.7 FEC REQUIREMENTS
The 8x100G-PSM8 link relies on the host system implementing the 400GBASE-R PCS layer inaccordance with clause 119 of IEEE Std 802.3-2018™. With FEC defined for 800GE in the future,
FEC requirement will be updated correspondingly. The PCS layer includes implementation ofRS(544,514) FEC encode and decode functions.

1.8 MECHANICAL DIMENSIONS
Mechanical dimensions are defined in module form factor MSA specifications.

8x100G-PSM8 Technical Specification Draft 1.0

2 8x100G-PSM8 OPTICAL SPECIFICATIONS
2.1 WAVELENGTH-DIVISION-MULTIPLEXED LANE ASSIGNMENTS
The wavelength range for the 8x100G-PSM8 Physical Medium Dependent (PMD) is defined inTable 2-1.
Table 2-1: Wavelength lane assignments
Lane

Center wavelength

Wavelength range

L01311 nm

1304.5 to 1317.5 nm

2.2 OPTICAL SPECIFICATIONS
The operating range for 8x100G-PSM8 PMD is defined in Table 2-2. A compliant PMD operates
on single mode fibers according to the specifications defined in Table 4-1 and characteristics inTable 5.1.
Table 2-2: 8x100G-PSM8 operating range
PMD type
8x100G-PSM8

Required operating range
2 m to 100 m

8x100G-PSM8 Technical Specification Draft 1.0

2.2.1 8x100G-PSM8 transmitter optical specifications
The 8x100G-PSM8 transmitter shall meet the specifications defined in Table 2-3.
Table 2-3: 8x100G-PSM8 transmit characteristics
Description
PAM4 Signaling rate, each lane (range)

Value
53.125 ± 100 ppm

Unit
GBd

Lane wavelengths (range)

1304.5 to 1317.5

nmSide-mode suppression ratio (SMSR), (min)30dB

Average launch power, each lane (max)Average launch power, each lanea (min)

4.0

dBm

-5.4

dBm

1.5

dBm

-3.3

dBm

-4.7
-4.8

dBm

4.5

dB

TDECQ – 10*log10(Ceq), each lane (max)dAverage launch power of OFF transmitter, each lane (max)

4.5
-20

dB
dBm

Extinction ratio (min)Transmitter transition time (max)

2.0
17

dB
ps

RIN17.1 OMA (max)Optical return loss tolerance (max)Transmitter reflectancec (max)

-136
17.1

dB/Hz
dB

-26

dB

Outer Optical Modulation Amplitude (OMAouter), each lane (max)Outer Optical Modulation Amplitude (OMAouter), each laneb (min)Launch power in OMAouter minus TDECQ, each lane (min):for extinction ratio ≥ 4.5 dB
for extinction ratio < 4.5 dB
Transmitter and dispersion penalty eye closure for PAM4 (TDECQ), eachlane (max)a Average launch power, each lane (min) is informative and not the principal indicator of signal strength.

A transmitter with launch power below this value cannot be compliant; however, a value above thisdoes not ensure compliance.
b Even if the TDECQ < 1.4 dB for an extinction ratio of ≥ 4.5 dB or TDECQ < 1.3 dB for an extinction ratioof < 4.5 dB, the OMAouter (min) must exceed this value.
c Transmitter reflectance is defined looking into the transmitter.
d C is a coefficient defined in IEEE Std 802.3-2018 clause 121.8.5.3 which accounts for referenceeq
equalizer noise enhancement.
Note: The Optical return loss tolerance currently is more stringent. It is still under discussion.

8x100G-PSM8 Technical Specification Draft 1.0

2.2.2 8x100G-PSM8 receive optical specifications
The 8x100G-PSM8 receiver shall meet the specifications defined in Table 2-4.
Table 2-4: 8x100G-PSM8 receive characteristics
Description
PAM4 Signaling rate, each lane (range)

Value
53.125 ± 100 ppm

Lane wavelengths (range)

1304.5 to 1317.5

Damage threshold, each lane (min)aAverage receive power, each lane (max)Average receive power, each laneb (min)Receive power, each lane (OMAouter) (max)Receiver reflectance (max)Receiver sensitivity (OMAouter), each lanec (max)

Unit
GBd
nm

5
4

dBm
dBm

-7.2

dBm

1.5
-26

dBm
dB

Equation (1) section 3.10

Stressed receiver sensitivity (OMAouter), each laned (max)Conditions of stressed receiver sensitivity test:

-3.2

dBm

Stressed eye closure for PAM4 (SECQ), lane under test
SECQ – 10*log10(Ceq), lane under test (max) e

4.5

dB

4.5

dB

OMAouter of each aggressor lane

1.5

dBm

a The receiver shall be able to tolerate, without damage, continuous exposure to an optical signal having

this average power level. The receiver does not have to operate correctly at this input power.
b Average receive power, each lane (min) is informative and not the principal indicator of signal strength.
A received power below this value cannot be compliant; however, a value above this does not ensurecompliance.
c Receiver sensitivity (OMA
outer), each lane (max) is informative and is defined for a transmitter with avalue of SECQ up to 4.5 dB.
d Measured with conformance test signal at TP3 (see 3.11) for the BER specified in IEEE Std 802.3-2018

clause 124.1.1.
e C is a coefficient defined in IEEE Std 802.3-2018 clause 121.8.5.3 which accounts for referenceeq
equalizer noise enhancement.

8x100G-PSM8 Technical Specification Draft 1.0

For TDECQ<1.4 dB

For SECQ<1.4 dB

Figure 2-1 Illustration of receiver sensitivity mask for 8x100G-PSM88x100G-PSM8 Technical Specification Draft 1.0

2.2.3 8x100G-PSM8 illustrative link power budget
An illustrative power budget and penalties for 8x100G-PSM8 are shown in Table 2-5.
Table 2-5: 8x100G-PSM8 illustrative power budget
Description
Power budget (for max TDECQ)
for extinction ratio > 4.5 dB
for extinction ratio < 4.5 dB
Operating distance
Channel insertion lossa
Maximum discrete reflectance
Allocation for penaltiesb (for max TDECQ)

Value

Unit

7.4
7.5
100

dB

2.8

dB

See Table 2-6dBm

for extinction ratio ≥ 4.5 dB
4.6dB
for extinction ratio < 4.5 dB
4.7
Additional insertion loss allowed
0dB
a The channel insertion loss is calculated using the maximum distance specified in Table 2-2 and cabled
optical fiber attenuation of 0.5 dB/km plus an allocation for connection and splice loss given in 5.2.1.
b Link penalties are used for link budget calculations. They are not requirements and are not meant tobe tested.

Table 2-6: 8x100G-PSM8 Maximum value for each discrete reflectance
Number of discretereflectance above -55dB
1
2
4
6
8
10

Maximum value for eachdiscrete reflectance
-37
-42
-45
-47
-48
-49

8x100G-PSM8 Technical Specification Draft 1.0

Unit
dB
dB
dB
dB
dB
dB

3 DEFINITION OF OPTICAL PARAMETERS AND
MEASUREMENT METHODSAll optical measurements shall be made through a short patch cable, between 2 m and 5 m inlength, unless otherwise specified.
Table 3- 1: Test patterns
Pattern

Defined ina

Pattern Description

Square wave
Square wave (8 threes, 8 zeroes)3
PRBS31Q
4
PRBS13Q
5
Scrambled idle
6
SSPRQ
a
These sub-clauses make reference to relevant clauses of IEEE Std 802.3-2018.

120.5.11.2.4
120.5.11.2.2
120.5.11.2.1
119.2.4.9
120.5.11.2.3

3.1 TEST PATTERNS FOR OPTICAL PARAMETERS
Table 3- 2: Test pattern definitions and related subclauses
Parameter

Pattern
Square wave, 3, 4, 5, 6 or valid
400GBASE-R signal

Wavelength
Side mode suppression ratio

3, 5, 6 or valid 400GBASE-R
signal3, 5, 6 or valid 400GBASE-R
signalAverage optical power
Optical modulation amplitude (OMAouter)Transmitter and dispersion eye closure for PAM4
(TDECQ)
Extinction ratio
Transmitter transition time
RIN17.1 OMA
Stressed receiver conformance test signal calibration
Stressed receiver sensitivity
a IEEE Std 802.3-2018.

Reference
3.3
122.8.2a3.4

4 or 66

3.5

4 or 6
Square wave or 6

3.7
3.8

Square wave
6
3 or 5

3.9
3.11
3.11

3.6

3.2 SKEW AND SKEW VARIATIONThe skew and skew variation is specified in IEEE Std 802.3-2018 clause 124.3.

3.3 WAVELENGTH
The wavelength of each optical lane shall be within the range given in Table 2-3 if measured per
TIA/EIA-455-127-A or IEC 61280-1-3. The lane under test is modulated using the test pattern
defined in Table 3-2.

3.4 AVERAGE OPTICAL POWER
The average optical power of each lane shall be within the limits given in Table 2-3 if measured

8x100G-PSM8 Technical Specification Draft 1.0

using the methods given in IEC 61280-1-1. The average optical power is measured using the test
pattern defined in Table 3-2, with the test setup in IEEE Std 802.3-2018 Figure 53-6.

3.5 OPTICAL MODULATION AMPLITUDE (OMAouter)
The OMAouter of each lane shall be within the limits given in Table 2-3. The OMAouter ismeasured using a test pattern specified for OMAouter in Table 3-2 as the difference between
the average optical launch power level P3, measured over the central 2 UI of a run of 7 threes,
and the average optical launch power level P0, measured over the central 2 UI of a run of 6
zeros, as shown in IEEE Std 802.3-2018 Figure 124–3. Each lane may be tested individually withall other lanes turned off, or by using an optical filter if the other lanes are active.

3.6 TRANSMITTER AND DISPERSION EYE CLOSURE PENALTY (TDECQ)The TDECQ and TDECQ – 10*log10(Ceq) of each lane shall be within the limits given in Table 2-3
if measured using the methods specified in IEEE Std 802.3-2018 clauses 121.8.5.1, 121.8.5.2,
and 121.8.5.3 using a reference equalizer as described in section 3.6.1, with the following
exceptions:
The transmitter is tested using an optical channel that meets the requirements listed inTable 3-3.
The signaling rate of the test pattern generator is as given in Table 2-3 and uses the test
pattern specified for TDECQ in Table 3-2.
The combination of the O/E converter and the oscilloscope has a fourth-order BesselThompson filter response with a bandwidth of approximately 26.5625 GHz to at least
1.3 x 53.125 GHz and at frequencies above 1.3 x 53.125 GHz the response should notexceed –20 dB.
The normalized noise power density spectrum, N(f) in Equation (121-9), is equivalent towhite noise filtered by a fourth-order Bessel-Thompson response filter with a bandwidthof 26.5625 GHz.
Pth1, Pth2, and Pth3 are varied from their nominal values by up to +/-1% of OMAouter inorder to optimize TDECQ. The same three thresholds are used for both the left and theright histogram.

8x100G-PSM8 Technical Specification Draft 1.0

Table 3- 3: Transmitter compliance channel specifications
Dispersiona (ps/nm)
Type8x100GPSM8

Minimum

Maximum

0.0465*λ*[1(1324/λ)4]

0.0465*λ*[1(1300/λ)4]Insertion
lossb

Opticalreturn lossc

Max
mean
DGD

Minimum

17.1 dB

0.8 psa The dispersion is measured for the wavelength of the device under test (λ in nm). The coefficientassumes 100 m for 8x100G-PSM8.
b There is no intent to stress the sensitivity of the O/E converter associated with the oscilloscope.
c The optical return loss is applied at TP2, i.e. after a 2 m patch cord.

3.6.1 TDECQ reference equalizer
The reference equalizer for 8x100G-PSM8 is same to that specified in IEEE Std 802.3cd clause140.7.5.1 with the following exceptions:— The FFE tap numbers increases to 21, with the main tap fixed in the center (11th tap)

3.7 EXTINCTION RATIO
Extinction ratio is measured using the methods specified in IEEE Std 802.3-2018 clause 124.8.6.

3.8 TRANSMITTER TRANSITION TIME
The transmitter transition time shall be within the limits given in Table 2-3 if measured using atest pattern specified for transmitter transition time in Table 3-2.
The test description for transmitter transition time is in IEEE Std 802.3cd clause 140.7.7.

3.9 RELATIVE INTENSITY NOISE (RIN17.1OMA)
RIN shall be as defined by the measurement methodology of IEEE Std 802.3-2018 clause 52.9.6
with the following exceptions:a. The optical return loss is 17.1 dB.
b. Each lane may be tested individually with the sum of the optical power from allof the lanes not under test being below –30 dBm.
c. The upper –3 dB limit of the measurement apparatus is to be approximately
equal to the signaling rate (i.e., 53.2 GHz).
d. The test pattern is according to Table 3-2.

3.10 RECEIVER SENSITIVITY
Receiver sensitivity is informative and is defined for a transmitter with a value of SECQ up to 3.4
dB. Receiver sensitivity should meet Equation (1), which is illustrated in Figure 2-1.
RS= max(-6.3, -7.7+SECQ)
Where
RS

is the receiver sensitivity

8x100G-PSM8 Technical Specification Draft 1.0

(1)

SECQ
sensitivity

is the SECQ of the transmitter used to measure the receiver

The normative requirement for receivers is stressed receiver sensitivity.

3.11 STRESSED RECEIVER SENSITIVITY
Stressed receiver sensitivity shall be within the limits given in Table 2-4 if measured
using themethod defined in IEEE Std 802.3cd clause 140.7.10 with the following exceptions:— The signaling rate of the test pattern generator, the extinction ratio of the E/O
Converter, as well as the RIN_OMA of transmitter are as given in Table 2-3 and Table 2-4
using test patterns specified in Table 3-2.
— The required values of the “Stressed receiver sensitivity (OMAouter), each lane(max)”,“Stressed eye closure for PAM4 (SECQ), lane under test”, “SECQ – 10*log10(Ceq),
lane under test (max)” and “OMAouter of each aggressor lane” are as given in Table 2-4.
— The block diagram for the receiver conformance test is shown in IEEE Std 802.3-2018
Figure 122-8.
The BER is required to be met for the lane under test on its own.
Stressed receiver sensitivity is defined with all transmit and receive lanes in operation.
Any of the patterns specified for stressed receiver sensitivity in Table 3-2 is sent fromthe transmit section of the PMD under test. The signal being transmitted isasynchronous to the received signal.

8x100G-PSM8 Technical Specification Draft 1.0

4 FIBER OPTIC CABLING MODEL
The fiber optic cabling model is shown in Figure 4-1

Figure 4-1: Fiber optic cabling model
The channel insertion loss is given in Table 4-1. A channel may contain additional
connectors as long as the optical characteristics of the channel, such as attenuation,
dispersion, reflections and polarization mode dispersion meet the specifications.
Insertion loss measurements of installed fiber cables are made in accordancewith ANSI/TIA/EIA-526-7/method A-1. The fiber optic cabling model (channel) defined
here is the same as a simplex fiber optic link segment. The term channel is used here forconsistency with generic cabling standards.
Table 4-1: Fiber optic cabling (channel) characteristics
Description
Operating distance (max)Channel insertion loss a,b (max)

800G-PSM8

Unit

100
2.8

m
dB

0.0

dB

0.16

ps/km

-0.19

ps/km

0.6

ps

37
Optical return loss (min)a These channel loss values include cable, connectors and splices.

dB

Channel insertion loss (min)Positive dispersionb (max)
Negative dispersionb (min)DGD_maxc

b Over the wavelength range 1304.5 to 1317.5 nm.
c Differential Group Delay (DGD) is the time difference at reception between the fractions of apulse that were transmitted in the two principal states of polarization of an optical signal.
DGD_max is the maximum differential group delay that the system must tolerate.
Note: Currently the channel follows the double link model, the connector loss is under discussion.

8x100G-PSM8 Technical Specification Draft 1.0

5 CHARACTERISTICS OF THE FIBER OPTIC CABLING(CHANNEL)
The 800G-PSM8 fiber optic cabling shall meet the specifications defined in Table 4-1. The fiber
optic cabling consists of one or more sections of fiber optic cable and any intermediateconnections required to connect sections together.

5.1 OPTICAL FIBER CABLE
The fiber optic cable requirements are satisfied by cables containing IEC 60793-2-50 type B1.1
(dispersion un-shifted single-mode), type B1.3 (low water peak single-mode), or type B6_a(bend insensitive) fibers and the requirements in Table 5- 1 where they differ.
Table 5- 1: Optical fiber and cable characteristics
Description
Nominal fiber specification wavelength

Value
1311

Unit
nm

Cabled optical fiber attenuation (max)

1a

dB/km

1300 ≤ λ0 ≤ 1324

nm

0.093

ps/nm2km

Zero dispersion wavelength (λ0)
Dispersion slope (max) (S0)a

The 1 dB/km attenuation is provided for indoor cable as defined in ANSI/TIA 568-C.3.

5.2 OPTICAL FIBER CONNECTION
An optical fiber connection, as shown in Figure 4-1, consists of a mated pair of opticalconnectors.

5.2.1 Connection insertion loss
The maximum link distance for single mode fiber is calculated based on an allocation of 2.75
dB total connection and splice loss. This allocation supports four MPO connections for double
link fiber optic cabling model. Connections with different loss characteristics may be usedprovided the requirements of Table 4-1 are met.

5.2.2 Maximum discrete reflectance
The maximum discrete reflectance shall be less or equal to the value shown in Table 2-6.

5.3 MEDIUM DEPENDENT INTERFACE (MDI) REQUIREMENTS
The PMD is coupled to the fiber optic cabling at the MDI. The MDI is the interface between
the PMD and the “fiber optic cabling” (as shown in Figure 4-1). Examples of an MDI include
the following:a)Connectorized fiber pigtailb)
PMD receptacle
When the MDI is a connector plug and receptacle connection, it shall meet the interface
performance specifications of IEC 61753-1-1 and IEC 61753-021-2.

8x100G-PSM8 Technical Specification Draft 1.0

NOTE---Transmitter compliance testing is performed at TP2 i.e. after a 2 meter patch cord, notat the MDI.

6 8x100G-PSM8 Module Color Coding
Transceiver modules compliant to the 8x100G-PSM8 Specifications use a color code to indicate
the application. This color code can be on a module bail latch, pull tab, or other visible featureof the module when installed in a system. The color code scheme is specified in Table 6-1.

Table 6- 1: 8x100G-PSM8 Module Color Coding
Color Code
TBD

Application
8x100G-PSM8 100 m reach

8x100G-PSM8 Technical Specification Draft 1.0