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The SN series are fast, non-latching MEMS switches. Available in configurations from 1x2, 2x2 and 1x4, they are the best choice where low Insertion Loss and low PDL are most important. The SN switches are also available for a wide variety of specialty single mode fibers such as 630 nm, 780 nm, 850 nm, 980 nm and also polarization maintaining fibers.

SN: Non Latching
SL: Latching

1 • Reliable • Instrumentation
2 • Specialty fibers • Source selection
3 • 1.5 dB insertion loss • Medical
4 • 1 ms response time • Telecom Network
5 • Low PDL • Sensor Network
6 • 60 dB crosstalk • Instrumentations measurement
7 • Miniature size
8 • 2x2, 2x1, 1x1 variants

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The Sercalo MEMS Switches SN series are opto-mechanicalswitches for the most demanding applications in fiber optic sensor systems and instrumentation.

The switch is available in 1x1, 1x2, 2x2 and 1x4 variants. The switch mechanism is available in either latching or non latching variants and has a very fast response time below 1 ms and below 1.5 dB insertion loss. The single mode switch is available for a number of specialties fibers covering design wavelengths such as 488 nm, 515 nm, 633 nm, 680 nm, 780 nm, 830 nm, 980 nm and 1064 nm. The 1x2 and 2x2 variants can also be made with polarisation maintaining PANDA fibers.

The miniature package withstands rugged environ-ments and is well suited for direct mounting on printed circuit boards. The switch is qualified according to Telcordia GR 1221.


The Sercalo MEMS switches are composed of an optical subsystem and an electrical driver interface. The optical switching function is realised by a silicon MEMS chip. In the latching SL variants, a bistable suspension mechanism keeps the last selected state in power off. In the non-latching SN variants, the switch returns into the bar state when electrical power is removed.

To operate the switch 5V and 0V are applied on the supply pins, which are used by the internal DC-DC converter to supply a high voltage for the actuator control. CMOS or TTL logic levels on the control pins switch the high voltage on the electrostatic actuator. To set the switch state in the latching variant, pin 2 respectively pin 3 are set to logic high (5V) for 10 ms and the corresponding switch state is selected. At rest pins 3 and 4 should be pulled to 0 V and must not be floating.

In the non-latching variant only pin 2 is used to set the state of the switch. To set the cross-state pin 3 must be at logic high. When pin 3 goes to logic low, or at power off, the switch returns into the bar state.


Description SN/SL switches speciality fibers


(for specialty fibers or Polarisation-Maintaining fibers)

Wavelength range nm Cut off   ~Cut Off +200 nm
Insertion loss1  dB   0.7 1.5
Crosstalk  dB   75 60
Backreflection dB   55 50
Polarisation Dependent Loss dB   0.02 0.05
Polarisation Extinction Ratio2 dB 18 24  
Repeatability3  dB     0.001
Switching Time ms   0.5 1
Durability  cycles   1 billion  
Voltage V 4 5 5.25
Power Consumption mW   5 10
Operation Temperature °C 0   70
Storage Temperature °C -40   85
Size (L x W x H) – for single mm 40x16.5x9.5

1 for 1x2, 2x2 switch, fibers = 5 ,6, 7 excluding connector loss. Fibers 2, 3 and 4 = 2 dB max. For 1x4 switch IL max < 3.0 dB.
2 with Panda fibers for 7 and 9 only.
3 value for constant temperature and polarisation.

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