Optical Switch Introduction

Infiberone managerGVIP2016/12/28 10:03:34

Optical Switch Introduction

Optical Switch

Definition :

Optical switch is one kind of passive products that can switch on or block optical signals or change optical signals into other routes.

These switches are designed for use in re-configurable optical add/drop multiplexers, optical cross-connect systems, and network switching for fault protection.

Function 

u  OLP=Optical line protection

u  OLM=Optical Line monitoring

u  OBP=Optical bypass protection

u  ROADM=Reconfigurable optical ADD/DROP multiplexer

u  OXC=Optical cross connection

u  Testing ect.

 

Commonly Used Technological platforms

u  Mechanical Optical Switch

u  Magneto-optical Optical Switch

u  Mach-Zehnder interferometric switch

u  Thermo-Optic Switch

u  Acoustic Optical Switch

u  LC=Liquid crystal Optical switch

u  MEMS/Micro electro mechanical optical switch

 

For different platforms, the optical parameters are little different,

e.g. IL/CT/PDL/WDL/TDL/Repeatability.

 

Comparison Between Different Platforms 

Platform

Parameters

Advantages

Disadvantages

Applications

IL

Crosstalk

Switching Speed

Power Dissipation

Mechanical

Low

Low

<10ms

Low

Low IL,
Latching or non-latching

Slow switching speed;
big size

OLP, OADM, testing

MO Switch

Low

Low

us

Low

IL, quick switching time

High cost

OLP, OADM, testing

M-Z Interferometric

High

Low

ns-us

Low

 quick switching time, 
compact size

Low ER, High IL

High speed switching

Thermo-optical

High

Middle

ms

Low

Compact size, integratable

High WDL, low switching speed

Mini switch OADM

Acoustic optical

High

Middle

ns-us

High

High speed

High IL &Cost &WDL

WSS

LC

High

Lower

us-ms

Low

Reliable, Polarization independent

Sensitive to temperature change

OADM

MEMS

Middle

Low

us-ms

Low

High exchange capacity

Long-term reliability not good

OXC, backbone

 

Mechanical Optical Switch

Gigalight’s Mechanical Optical switch falls into seven categories:

 

Ø  1x2;

Ø  1x4;

Ø  1x8;

Ø  2x2 full;

Ø  2x2 Bypass;

Ø  2×4 (dual 1x2)

Ø  4x4 (dual 2x2 B)

Key Characteristics:

Ø  Switching time <=10ms,

Ø   Repeatability<=0.04dB,

Ø  Durability Cycles ≥ 10 Million.

 

Application Scenario:

Ø  Fiber ring;

Ø  Automatic testing;

Ø  Remote control/monitoring;

Ø  Route Switchover;

Ø  System monitoring ;

Ø  ROADM ;

Ø  Optical protection systems ;

Ø  Fiber sensor ect.

 

Application of Different optical switches

1. 1×1 optical switch is usually used to block light path.

2. 1x2 Optical SwitchUsually used for optical line protection: OLP for short.

2.1 1+1 OLP(双发选收)

2.2 1:1 OLP(选发选收)

2.3 1-1 OLP

3. 2x2 Optical Switch

Usually used for FDDI, Optical bypass protection, loopback testing ect.

3.1 2x2B  optical Switch

OBP=Optical bypass protectionwith in-built 2x2 bypass switch to change the optical path, it can real-timely monitor optical power received  from R3 and R4 as well as the optical power launched from transmitters R1 and R2. OBP uses the same power supply with transceivers.  When local equipment functions normally, OBP changes back to normal routes, when local equipment is found abnormal or powered off, OBP will change to bypass routes, thus pass by local failure nodes.

3.2 1:1 Bidirectional Protection (2x2 Full)

4. MXN Optical Switch

4.1. Network monitoring system:

1XN switch

4.2. Optical testing system.

Other applications

1x2  OSW Specification:

 

Operating wavelength range: From 1260-1620nm

 

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