Optical Interleavers

In each CWDM channel (in O-band or E- Band), there are 16 sub-DWDM channels at the low-wavelength (Low-Band) side, or the high-wavelength (High- Band) side of each CWDM channel (1271, 1291, 1311, 1331, 1351, 1411, 1431, 1451 and 1471), respectively.
Each CWDM channel has a +/-7.5nm channel width, while the High-Band is defined as the CWDM channel + 7.5nm while the low-band is defined as CWDM channel – 7.5nm. Within the High- or the Low-Band, there are total 16 DWDM channels, respectively, with a channel spacing of about 0.37nm. The MUX (or DeMUX) is based on optical interleaver and DWDM thin film filters. This configuration has wide operating temperature range (-40C to +85C) and superior performance, such as wide passband width, low insertion loss, high isolation, and excellent thermal stability, etc., over AWG technology.BBN International supplies Optoplex 5G PON MUX/DeMUX 50/100GHz Interleaver & 100GHz DWDMs

Conventional Optical Interleaver is Symmetric Optical Interleaver. By "Symmetric" we mean that both "Odd" and "Even" channels have the same passband widths and waveforms. Optoplex offers a new type of Optical Interleaver whose "Odd" and "Even" channels have different passband widths and waveforms. This is FlexSlicer™ Asymmetric Optical Interleaver.BBN International supplies Optoplex, fibre optics, fiber optics, optical interleaver, asymmetric

Product Description - Co-Packaged Optical Interleaver

Co-packaged interleaver consists of a pair of iterleavers in the same package. There are three input ports and three output ports. The interleaver pair may contain one interleaver (Mux) and one deinterleaver (DeMux), or a pair of (Mux) interleavers, or a pair of (DeMux) interleavers. Customers can specify configurations according to their design and applications.

Optoplex’s Optical Interleaver products are based on our patented Step-Phase Interferometer design. Used as a Demux (or Mux) device, an optical interleaver separates (or combines) the Even and Odd channel signals (see the schematic diagram below). Each optical interleaver device is optimised to cover either C-, L-, O-, or E-band wavelengths, with the option of covering C+L band. The current optical interleaver product family supports 100-200, 50-100, 25-50 GHz channel spacing, as well as other custom channel spacings. The Demux and Mux interleavers can be effectively co-packaged into a single box for easy handling and cost-saving. Dual-stage optical interleavers (such as 25-100 GHz) and asymmetric interleavers (Even and Odd channels have different passband widths) are also available.BBN International supplies Optoplex O- and E- Band CWDM Interleavers

An innovative technique for expanding the number of channels per fiber involves an optical device, called an optical interleaver. For example, in most DWDM equipment, the standard channel spacing is 100 GHz. But spacing the signal-carrying frequencies every 50 or even 25 GHz can double or even quadruple the number of channels per fibre. This job is accomplished by an optical interleaver. Such a device takes two multiplexed signals with 100-GHz spacing and interleaves them, creating a DWDM signal with channels spaced 50 GHz apart. The process can be repeated, creating even denser composite signals with 25-GHz or 12.5-GHz spacing. The signals at the receiving end are recovered with the same devices used as splitters or optical de interleavers. Thus, devices and/or networks can be upgraded without requiring that all devices be upgraded, or network bandwidth can be increased.BBN International supplies Optoplex, fibre optics, fiber optics, standard optical interleaver

Product Description - Switchable Optical Interleaver

In a switchable interleaver, there are two operation modes:

Mode A: All pass

Mode B: Interleaver

In Mode A, the system operates at any channel spacing, in which all channels pass through the device and output from one of the two output ports as if there is no extra device inserted. When the system is switched to Mode B, the device operates as a normal optical interleaver, such 50-100GHz interleaver. The working principle is schematically shown below.

In Mode B, the device could be a standard symmetric interleaver, or an asymmetric interleaver. Channel spacings are not limitted to 50-100GHz. They can be any frequency pair: between N-GHz and 2N-GHz.