FILTERS 

Optical communications services have been spotlighted as a rapid growing industry towards the 21st century, and film-coated optical products have greatly contributed to the expansion of these services. Because of their high accuracy and durability proven in WDM transmission systems, Band-Pass Filters, Beam Splitters, etc., from OCJ have been widely used, demonstrating their outstanding performance.

Schematic

This dielectric multi-cavity filter is characterized by low insertion loss, wide pass band and steep slope. It is well suited for 200GHz and 100GHz D-WDM, as an ASE noise cut filter of the beam amplifier and for improvement of cross-talk of AWG.

2-cavity BPF Typical spectral characteristics

3-cavity BPF Typical spectral characteristics

4-cavity BPF Typical spectral characteristics

dB to Transmission Table

This dielectric multi-cavity (9-cavity in this instance) filter features high isolation, low insertion loss and flat transmission region, and high durability by OCJ's PID (plasma ion deposition) process. Its is applicable for Blue-/Red-band separation.

Typical spectral characteristics

This filter has characteristics of low insertion loss, good flatness at the pass band and high isolation due to steep separation properties. The filter is used for separation of the signal of 1.55µm from the pump laser of 1.48µm and the monitoring signal of 1.51µm. Custom design of incident angle and wavelength is available.

Typical spectral characteristics

This filter is utilized for High Precision Etalon. Centre wavelength, amplitude, cycle period, etc., can be designed independently. Gain flattening of the laser beam amplified by EDFA can be achieved.

Typical spectral characteristics

This filter is of the plate type and can separate S and P polarized beams to transmit and reflect these respectively at low insertion loss. This can be smaller than a prism type, and has advantage of being free from any adhering agent in the beam path.

Typical spectral characteristics

This is a hybrid plate-type filter simultaneously coupling and splitting 1.3µm and 1.5µm bands with low polarization dependent loss and low ripple. Incident angle, separation ratio, etc., can be designed independently.

Typical spectral characteristics

This filter exhibits low insertion loss, good flatness of the transmission band and high isolation due to steep slope separation parameters. This is the optimal filter for separation of signals in FTTH.

Typical spectral characteristics

AR coating for decreasing reflectance to less than 0.2%  at tip end of fibre. Free designs with single and multi-wavelength can be offered because coating is possible at low temperature.

Typical spectral characteristics

This filter has the following features: minimization PDL for transmission and reflection; high isolation by a steep slope, high durability by OCJ's proprietary Plasma Ion Deposition process. Custom design is available.

Typical characteristics:

T 1.48µm </=0.3dB    R 1.55µm >/=30dB

Typical spectral characteristics

This filter features high durability by OCJ's proprietary Plasma Ion Deposition process. Custom design is available.

Typical characteristics:

T 1.55µm </=0.3dB    R 1.31µm >/=30dB

Typical spectral characteristics