Chapter 15, Dual Optical S-1.1 Module, S1.1-2-LC

Table Of Contents

Dual Optical S-1.1 Module, S1.1-2-LC

15.1  Module Description

15.1.1  Power Consumption

15.2  External STM-1 S-1.1 interface

15.2.1  Connector Type

15.2.2  Optical Budget

15.2.3  Compliance

Dual Optical S-1.1 Module, S1.1-2-LC

15.1  Module Description

The module contains two optical STM-1 interfaces that meets the S-1.1 specification in ITU-T G.957. The physical connector is a LC connector.

15.1.1  Power Consumption

9 W.

15.2  External STM-1 S-1.1 interface

The two optical STM-1 interfaces use dual fiber interface, LC style connector, one fiber in each direction, 1310nm wavelength and use single mode fiber of type 10/125 um. The optical interfaces is compatible with ITU-T 957 for S-1.1.

The interface is an optical STM-1 short haul interface, according to clause 5 ITU-T G.957 The definitions of optical parameters and reference points S and R refer to ITU-T G.957. Reference point S means transmit direction while R is the receive direction of the fibre.

15.2.1  Connector Type

The physical connector is a LC connector.

Figure 15-1 S1.1-2-LC Module

15.2.2  Optical Budget

Table 15-1 S-1.1 Interface Optical Budget

Parameter

Value

Modulation rate on optical line

155 520 kbit/s

Wavelength range

1261 - 1360 nm

Transmitter at reference point S

Source type

MLM

Spectral characteristics (max. RMS width)

7.7 nm

Mean launched power (max.)

-8 dBm

Mean launched power (min.)

-15 dBm

Min. extinction ratio

8.2 dB

Optical path between S and R

Attenuation range

0 - 12 dB

Max. tolerable dispersion

96 ps/nm

Min. optical return loss

NA

Max. discrete reflectance between S and R

NA

Receiver at reference point R

Min. sensitivity (BER < 1 in 1010)

-28 dBm

Min. overload

-8 dBm

Max. optical path penalty

1 db

Max. reflectance at R

NA

15.2.3  Compliance

Table 15-2 Optical S-1.1 Interface Compliance

Standard

Comment

ITU-T G.652

Type of optical fibre

ITU-T G.707

Optical line signal

ITU-T G.783

RX pull-in and hold range

ITU-T G.813

Optical output jitter

ITU-T G.825

Optical input jitter

ITU-T G.957

Optical spectrum

Optical output power

Optical eye diagram

Optical extinction ratio

ITU-T G.958

Input jitter measurement

Parameter	Value
Modulation rate on optical line	155 520 kbit/s
Wavelength range	1261 - 1360 nm
Transmitter at reference point S
Source type	MLM
Spectral characteristics (max. RMS width)	7.7 nm
Mean launched power (max.)	-8 dBm
Mean launched power (min.)	-15 dBm
Min. extinction ratio	8.2 dB
Optical path between S and R
Attenuation range	0 - 12 dB
Max. tolerable dispersion	96 ps/nm
Min. optical return loss	NA
Max. discrete reflectance between S and R	NA
Receiver at reference point R
Min. sensitivity (BER < 1 in 1010)	-28 dBm
Min. overload	-8 dBm
Max. optical path penalty	1 db
Max. reflectance at R	NA

Standard	Comment
ITU-T G.652	Type of optical fibre
ITU-T G.707	Optical line signal
ITU-T G.783	RX pull-in and hold range
ITU-T G.813	Optical output jitter
ITU-T G.825	Optical input jitter
ITU-T G.957	Optical spectrum Optical output power Optical eye diagram Optical extinction ratio
ITU-T G.958	Input jitter measurement