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Fiber optic Switch
eol 1x2 •••• 1x4 •••• 2x2
eol 1x8 •••• 1x12 •••• 1x16
OPERATION MANUAL
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CONTENTS
Product Specification
• Features / Applications / Technology …………………………………. 3
• Optical Characteristics …………………………………. 4
• Electrical & Environmental Characteristics …………………………………. 4
• Performance Curves …………………………………. 5
Switch Operation
• Pin Configuration ………………………………………. 6
• Serial Interface ………………………………………. 9
• Parallel Interface ………………………………………. 10
• I 2 C Interface ………………………………………. 12
• Device Housing / Mounting ………………………………………. 14
Handling Instructions
• Handling of Fibers ………………………………………… 15
• Cleaning & Mating of Connectors ………………………………………… 15
Any information established by manufacturer is believed to be accurate and reliable. However, no responsibility is assumed by
manufacturer for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of manufacturer.
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FUNCTIONAL BLOCK DIAGRAM
FEATURES
• excellent repeatability
• ultra low back reflection
• low insertion loss and PDL
• high optical isolation
• broad spectral range
• polarization maintaining option
• short switching time
• small dimensions
APPLICATIONS
• testing and measurement
• fiber optic sensing
• add/ drop multiplex system
• network fault protection
• signal protection
• laser scanning microscopy
• fiber bragg sensors
• multi channel optical power monitoring
TECHNOLOGY
eol
series switches were developed to serve for
the most demanding applications in testing and
measurement. Its optomechanical design
(MOEMS) ensures an excellent optical
performance combined with short switching time
due to refractive microoptical componen
ts and
industry proofed high resonant actuators. The
small package size and unilateral fiber location
simplify the switch accomodation on printed
circuit boards. The implemented microcontroller
provides versatility in interface programming and
controlling.
opto
-
mechanical
system
actuators
MICRO-
CONTROLLER
RS232
I2C
parallel
interface
electronic interfaces and controller
VCC GND
RxD
TxD
D0
D1
Strobe
SDA
SCL
Ch1
Input
Ch4
Ch3
Ch2
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OPTICAL CHARACTERISTICS
parameter
unit
test conditions / comments
insertion loss 0.7 dB
typ.
@ 1.55µm and 1,31µm
1.0 dB
max.
1.4 dB
max.
@ 0.80µm and 0,65µm
2.0 dB max @ 0.46µm … 0.60 µm
back reflection <-65 dB @ 1,55µm
crosstalk <-55 dB
repeatabiltiy 0.005 dB
5000 cycles @ 1Hz, constant
temperature
standard wavelength range 400…670 nm
600...850 nm
other wavelengths on request
900…1200 nm
1260 - 1360
1480 - 1650
nm
polarization depending loss < 0.1 dB
switching time
switching frequency
≤2
50
ms
Hz
max.
reliability > 108 cycles
power consumption < 300 mW
ELECTRICAL
CHARACTERISTICS
parameter
unit test conditions / comments
operating voltage 5 V
switching current 50 mA
min.
switching frequency = 0Hz
100 mA
typ.
300 mA max. switching frequency = 50Hz
ENVIRONMENTAL CHARACTERISTICS
parameter
unit test conditions/comments
storage temperature -40 to +80 °C
operating temperature 0 to +60 °C
vibration stability Up to 10 g
no influence on optical
characteristics
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PERFORMANCE CURVES
-0,003
-0,002
-0,001
0
0,001
0,002
0,003
0 100 200 300 400 500 600 700 800
CYCLES
VARIATION OF THE IL
[dB]
REPEATABILITY
VARIATION OF IL
[dB]
Cycles
SWITCHING CHARACTERISTICS
THERMAL CHARACTERI
STICS
-0,15
-0,0 5
0,05
0,15
0 15 30 45 60
TEMPERATURE (°C)
INSERTION LOSS (dB)
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PIN CONFIGURATIO
N 1x2; 2x2; 1x4
# PIN PIN name type
*)
function test
1 VCC P positive voltage 5V
2 GND P ground, (reference point for interfaces)
3 TxD O transmitter data output of serial port
4 RxD I receiver data input of serial port
5 SDA I/O I2C-compatible input/output pin
6 SCL I/O serial clock pin for I2C interface
7 - not used
never connect this pin to GND or Vcc
8 D0 I address bit 0 for the TTL/parallel interface
9 D1 I address bit 1 for the TTL/parallel interface
10 strobe I clock pin for parallel interface
*)
notes: • P power supply
• I input
• O output
• I/O input and output simultaneously
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PIN CONFIGURATION 1x8; 1x12
; 1x16
# PIN PIN name type
*)
function test
1 VCC P positive voltage 5V
2 GND P ground, (reference point for interfaces)
3 TxD O transmitter data output of serial port
4 RxD I receiver data input of serial port
5 SDA I/O I2C-compatible input/output pin
6 SCL I/O serial clock pin for I2C interface
7 - not used
never connect this pin to GND or Vcc
8 D0 I address bit 0 for the TTL/parallel interface
9 D1 I address bit 1 for the TTL/parallel interface
10 D2 I address bit 2 for the TTL/parallel interface
11 D3 I Address bit 3 for the TTL/parallel interface
12 strobe I clock pin for parallel interface
*)
notes: • P power supply
• I input
• O output
• I/O input and output simultaneously
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SERIAL INTERFACE
The RS232 interface allows to control the switch from your PC or laptop directly. The interface is
protected for short circuits by GND.
CABLE CONNECTIONS
eol 1x4
- pin code
Computer
DB-9 pin
Computer
DB-25 pin
2 GND 5 7
3 TxD 2 3
4 RxD 3 2
COMMANDS
All commands must be sent in ASCII code. A command is not executed until terminated by a carriage
return (ASCII decimal code 13) and a new line (ASCII decimal code 10).
COMMAND SUMMARY
command name
parameter
response
function
type? none
“eol1x4” 1
response of the switch type
firmware? none
“ver3.27”
response of the firmware version number
ch? none
“2”
indicates the current switch position
ch
“1”..”4” 2
none sets into the specified position
example: “ch3” -> enables channel 3
i2c?
Actual i2c
adress
Response for the set i2c adress
i2c
“10”…”99”
Setting the i2c adress
Note: 1 response for eol1x2: “eol 1x2” and for eol 2x2: “eol 2x2”
2
for the eol1x2 and eol2x2 switch use “1” and “2”
SETTINGS
- 57600 Baud (standard)
- 8 data bit
- no parity
-
1 stop bit
SPECIFICATIO
NS
- T
out
= ±9V (typ.)
- Rin = ±25V (max.)
- RS232 input threshold low = 1.3V (typ.)
-
RS232 input threshold high = 1.8V(typ.)
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Parallel Interface
- Switch can only receive data, not transmit
- Switch can be programmed either with or without a chipselection signal (strobe)
- Interface operates with standard TTL levels (see LEONI Manual)
- Case1: without strobe
After detecting a new switching state (binary code) at the data input port, the switches moves
to the corresponding channel after time delay t
1.
In order to avoid problems this code must be
kept constant for this period.
t1 > 40µsek
- Case 2: with Strobe (standard interface operation)
By a HIGH– LOW slope, data at the parallel interface ports are transferred into the switch and
stored there (latch). The LOW level for the strobe input must be constant for a time period t1.
Before the HIGH – LOW slope the strobe signal has to be at HIGH level at least for a time
duration t2 . Switching occures after a duration t3.
t1 >45µsek
t2 >45µsek
t3 t1+20µsek
CH n
CH m
DATA0..3:
t
1
Mechanical
Switching process
CH m
DATA0..3:
t
1
Mechanical
switching
Strobe:
t
2
t
3
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Please note:
After each switching process the switch will not accept signals for the next 6 ms. Other values
are possible on costumers request.
(See the following table for the necessary binary code corresponding to the required switch
channels.
Please note that data pins D3 and D2 are not used for switch configurations 1x2; 2x2; 1x4).
D3 D2 D1 D0 Channel
0 0 0 0
1
0 0 0 1
2
0 0 1 0
3
0 0 1 1
4
0 1 0 0
5
0 1 0 1
6
0 1 1 0
7
0 1 1 1
8
1 0 0 0
9
1 0 0 1
10
1 0 1 0
11
1 0 1 1
12
1 1 0 0
13
1 1 0 1
14
1 1 1 0
15
1 1 1 1
16
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I2C INTERFACE
- Fiber switch operates as “Slave“
- Interface corresponds to PhilipsSpecs – standard mode (see Philips-Homepage)
o Deviations from standard:
- Switch does not respond to the common adress 0000000b
- (this is even not a stringent requirement)
- switch does not support a 10Bit adressing
- Switch can only receive data, not transmit
- In correspondence to the specifications of the standard mode only bitrates up to 100kBit are
accepted. Higher bitrates will lead to noncorrect function of the switch.
- After a switching operation is initiated through an interface (also valid for parallel interface and
RS232) it will be blocked for a 20 ms period in order to avoid overload of the high-voltage
electronics (this is also valid for parallel and RS232)
- The following figure (taken from the Philips Dokumentation) shows the typical Timing for the
I²C-Bus:
Adress: 68 (1000.100 + 0b)
Data byte: for channel 1: 0000.0001b
for channel 2: 0000.0010b
for channel 3: 0000.0011b
.
.
.
for channel 12 : 0000.1100b
The initial adress (set at works) is 68.
This initial adress can be changed by an appropriate command through the RS232 interface.
For this purpose additional to the existing commands of the RS232 interface:
o ch?
o ch
o firmware?
o type?
Adress R/W-Bit
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Two additional commands have been added for the support of the I2C interface:
o i2c? this allows to query the actual I2C adress
o i2c this allows to set the I2C adress to any fixed value between 10 and 99
(for example i2c15 sets the adress 15
After a new adress has been set, it remains unchanged even after switch off the power supply, as this
adress is stored in the flash memory of the controller.
Important: Please write the commands in small letters!! The commands must be activated by a
carriage return!!
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DEVICE HOUSING (small)
DEVICE HOUSING (large)
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Handling Instructions for Fiberoptic Components
CAUTION! Any extreme stresses onto the optical cable could degrade the
optical performance or damage the fiber.
• Do not pull on the fibers !
• Never bend an optical cable more sharply than a 35mm radius!
• Bending over any sharp edges may damage or break the fiber!
• Avoid excessive heat near cables!
•
All optical connectors should remain covered with dust cups in place when not in use.
Cleaning & Mating Instructions for Optical Connectors
• Clean both connectors prior to mating by using a high-grade isopropyl alcohol and a
cotton swab.
• Allow connectors have to dry before mating.
• Insert the connector ferrule into the appropriate adapter smoothly.
• Do not over-tighten the connectors.
•
Specifications for the eol series switches are based on an optimal connection. If the
resulting values are unacceptable, please repeat the cleaning procedure and start
again.
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