Custom Dual 2x2 Half Duplex Switch (D22HC)

Overview

The dual 2x2 half duplex fiber optic switch is two half duplex 2x2 optical switches in one switch with an extra path in state 2.

Optical Connectivity

The following diagrams show the optical connections for the 2 states. The numbers identify the fiber endpoints. If looking at it as 2 single half duplex 2x2s, fibers 1, 2, 7 and 8 make up one 2x2 while fibers 3, 4, 5 and 6 make up the other. Note the extra path connecting fibers 2 and 6.

State 1

D22HC State 1

State 2

D22HC State 2

Extra Path

Although most applications do not require the connection between fibers 2 and 6 in state 2, it is often not an issue and in some cases may be a desired feature (e.g. a loopback for self-testing of a transmitter/receiver pair).

Power Off Bypass Application Example

One application of a dual 2x2 half duplex fiber optic switch is to bypass a transmit/receive module that is daisy changed with other modules (e.g. a token ring application). In this application, selecting a reversed non-latching drive type allows the module to be bypassed automatically when power is lost.

Below, the diagram illustrates how inserting a D22HC in a ring or daisy chain topology allows a module to be optically disconnected from the ring or daisy chain while keeping the other modules connected in the same topology. A "ring module" represents any dual channel optical device intended to be connected in a ring or daisy chain.

D22HC State 1

State 1

In state 1, the top "ring module" is connected to the "ring" or daisy chain.

D22HC State 2

State 2

In state 2, the top "ring module" is disconnected from the "ring" or daisy chain.

Note that the extra path would have no negative effect since it is simply looping a transmitter back to a receiver.

Of course the previous diagram could be expanded to have a D22HC providing power off bypass protection to the other two modules as well.

Base Price (USD): $507.18
'
D22HC - X1 - X2 - X3 - X4 - X5 - X6 - X7
Option Description Price (USD)
X1: Fiber Type
S1
Singlemode 9/125
Corning SMF-28 9/125 or equivalent
$50.72
M1 Multimode 62.5/125 $0.00
M2 Multimode 50/125 $0.00
M3 Multimode 100/140, Graded Index, NA=0.29 $40.57
M4 Multimode 50/125 Step Index, NA=0.22 $25.36
M5 Multimode 105/125 Step Index, NA=0.22 $40.57
S2
Singlemode HI1060
Corning HI1060 6.2/125@1060 (Nonstock fiber, may be subject to minimum quantity)
$60.86
X2: Drive Mode
L
Latching
Latching switches require no steady state input power. The switch is set to state 1 or state 2 by a single pulse of 20 milliseconds or longer. Continuous current is preferable to maintain the switched state under high vibrational stress. The latching design retains its switched state during a power loss.
$0.00
N
Non-Latching (Power off = State1)
Non-latching switches require continuous drive current and functions like a conventional relay, which may not retain state during a power loss.
$0.00
NR
Non-Latching Reversed (Power off = State 2)
Non-latching switches require continuous drive current and functions like a conventional relay, change to the bypass state during a power loss.
$0.00
X3: Connectors
NC
none
also known as pigtailing.
$0.00
FC FC/PC $223.93
SC SC/PC $223.93
ST ST/PC $223.93
FCU
FC/UPC
Ultra polished
$223.93
STU
ST/UPC
Ultra polished
$223.93
LC LC/PC $223.93
DLC Duplex LC/PC $223.93
FCA FC/APC $307.90
X4: Cables
1
900µm Tight Buffer
900µm tight buffered tube
$0.00
X5: Cable Length
1 1.0 Meter $0.00
2 0.5 Meter $0.00
3 2.0 Meters $60.86
X6: Voltage
5
5V, 100 ohm
Requires a minimum of 4.2V. Low voltages will result in reduced switch speed.
$0.00
3
3V, 35 ohm
Requires a minimum of 2.5V. Low voltages will result in reduced switch speed.
$0.00
5H
5V, 50 ohm
Requires a minimum of 4.2V. Low voltages will result in reduced switch speed.
$0.00
5T
5V, 33 ohm
Requires a minimum of 4.2V. Low voltages will result in reduced switch speed.
$0.00
X7: Loss
L
Low
Typical 0.25 dB loss for singlemode, 0.05-0.10 dB loss for multimode. Utilizes a discrete amount of matching fluid at the gap.
$0.00
N
Normal
Typical 0.7 dB loss for singlemode, 0.5 dB loss for multimode. Features an air gap.
$0.00

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More Information

For more information, see Switch Overview for information that applies to all switch products.


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