Technical Support
Sales T&C
Purchase T&C
Warranty Policy
Home >   Support > Frequently Asked Questions
Frequently Asked Questions  
General Information
1. Where is Optoplex headquarters?
Optoplex is headquartered at 48500 Kato Road, Fremont California, USA. Telephone: +1 (510) 490 9930
2. Is Optoplex ISO certified?
Yes. Optoplex is an ISO-9001:2000 certified company. Optoplex's QMS System has successfully passed ISO-9001:2000 certifying audit by a seasoned world-class quality system certifying organization.
3. Can Optoplex provide OEM products?
Yes. Optoplex will discuss OEM opportunities for its products with standard or non-standard specifications. Please contact Optoplex Sales persons for such a discussion.
4. What is Optoplex core technology?
Optoplex's products are based on its patented free-space micro-optics technologies and state-of-the-art, in-house thin-film coating, which are foundations for Optoplex's DPSK demodulator, DQPSK demodulator, 90° optical hybrid, Polarization diversified optical hybrid (QPSK mixer), 2-port tunable optical filter, 3-port reconfigurable optical add/drop multiplexers (ROADMs), Tunable edge filter, Bandwidth-tunable filter, Tunable notch filter, Optical interleaver, Flat-top comb filter, Optical channel monitor (OCM), Optical performance monitor (OPM), DWDM wavelength meter, and Portable spectrometer.
5. Are Optoplex's products compliant with RoHS requirements?
Yes. Optoplex's products are RoHS compliant.
6. Where does Optoplex produce its products?
Optoplex produces its products in both Fremont California and its qualified CM in China.
DPSK Demodulators
1. How many types of DPSK demodulators arecurrently available?
Three types of DPSK Demodulators are available: Passive (fixed), Fully tunable, and Semi-tunable.
2. What (which parameter) is tunable on Optoplex's tunable demodulators?
Frequency alignment of the constructive and destructive outputs. For a given device, its free spectral range (FSR) is not tunable.
3. What is the tuning mechanism used in Optoplex's tunable DPSK demodulators?
Optoplex's tunable DPSK demodulators utilize the temperature-dependence of an optical part to adjust the phase difference between the two interference beams. The tuning is achieved by varying the temperature of that part through a resistance heater.
4. What is the difference between the fully tunable type and the semi-tunable type?
The fully tunable DPSK demodulator has wider tuning range and faster tuning speed compared with the semi-tunable type.
5. What is the advantage of each type?
For the passive DPSK demodulator, the main advantages are the colorless application (each device with 40- or 50-GHz FSR can be used for all DWDM channels and no need for electric power and the control circuit.) For the fully tunable DPSK demodulator, the user usually choose the FSR to exactly match the signal rate. The main advantage is the ability of tracking signal frequency drift (laser aging; temperature dependence; transmission related frequency chirp) to avoid OSNR penalty. The semi-tunable type combines the advantages of the passive and fully tunable type. It maintains the colorless feature (by choosing 40- or 50-GHz FSR) while gaining some degree of frequency-tracking ability.
6. Does Optoplex provide other types of phase demodulators?
Yes. Optoplex is a leading company in the market to provide DPSK, DQPSK, 90-degree optical hybrid, and QPSK mixer products. These products support 10Gb/s - 100Gb/s modulation rates. Recently, Optoplex expands its phase demodulator products to integrated receivers.
Optical Interleavers
1. Can Optoplex provide optical interleaver with channel center frequency offset from the ITU grid?
Optoplex optical interleaver platform is flexible in frequency alignment. Please specify your interleaver channel plan upon ordering.
2. Can Optoplex provide asymmetric optical interleaver?
Yes. Optoplex provides both standard optical interleaver and asymmetric optical interleaver. For asymmetric interleavers, customer can specify the bandwidth ratio between even and odd channels.
3. Can Optoplex provide co-packaged optical interleaver?
Yes. Optoplex provides co-packed optical interleaver, which consists of a pair of interleavers. The interleaver pair can be one Mux interleaver plus a DeMux interleaver, or two Mux interleavers, or two DeMux interleavers.
4. Can Optoplex provide multi-stage optical interleaver?
Yes. Optoplex provides multi-stage optical interleaver. Typical one is a 50GHz-200GHz two-stage interleaver.
5. Can Optoplex provide switchable optical interleaver?
Yes. Optoplex provides switchable optical interleaver and asymmetric optical interleaver. It supports two operation modes: 1) All Pass and 2) Interleaving. In All Pass mode, the device acts as a transparent medium while in Interleaving mode, the device becomes a standard interleaver. The switching between the two operation modes is achieved by external electric control.
Optical Tunable Filters
1. What types of optical tunable filters can Optoplex provide?
Optoplex produces 2-port and 3-port tunable filters, supporting 50GHz, 100GHz, and 200 GHz channel spacings.
2. What is electrical interface of Optoplex tunable filters?
Both 2-port and 3-port tunable filters use RS232 communication protocol, TTL and LVTTL compatible.
3. How to obtain a bandwidth-table filter?
Optoplex provides both low-pass and high-pass tunable edge filters. By cascading a low-pass tunable edge filter and a high-pass tunable filter, a bandwidth-tunable filter can be obtained. Such a tunable filter has flexibility to tune both its center wavelength and bandwidth.
4. How to control center wavelength?
There are a few different tuning modes/commands. You can tune the device from one channel to another channel by using C-command (Channel command). You can also tune the filter wavelength step by step with M-command in order to accurately position the filter.
5. What is tuning wavelength accuracy?
Channel setting or tuning wavelength accuracy is ~ 15-20 pm.
Optical Performance/Channel Monitors
1. What types of optical monitors does Optoplex can provide?
Optoplex provides 1) Optical performance monitor, 2) Optical channel monitor, 3) DWDM wavelength meter, 4) Mini spectrum analyzer. Optoplex also offers low-cost version of optical monitor that only monitor channel powers of DWDM system.
2. What parameters does optical monitor report?
Channel power, channel wavelength or OSNR.
3. What is the electric interface?
Optoplex provides either DPRAM or RS232 (UART). Only one type of communication protocol is installed in one given optical monitor.
4. Can Optoplex OPM/OCM support 40G?
Yes. Optoplex OPM/OCM supports various 40Gb/s modulation formats, including ODB, DQPSK, DPSK, etc.
5. What is difference between optical performance/channel monitor and Mini spectrum analyzer?
Optical performance/channel monitor is the channelized device that reports parameters according to channels. By contrast, Mini spectrum analyzer outputs spectrum data at high-resolution (small step size).