Our semiconductor laser diodes include, distributed feedback (DFB) lasers, and electro-absorption modulator integrated DFB (EA-DFB) lasers. With DFB lasers, NEL can prepare any wavelength between 1300 and 1650nm, with a wavelength selection of 1 nm.   NEL's Photodiodes (PD) are characterized by their high-speed operation. 1) model Number [NLK2C1B1KC] is Designed for 10 GHz use. 2) model Number [NLK2C6E1VD] is Designed for 40 GHz use. model Number [NLK2C1B1KC] requires an external bias-T for DC biasing   Fluoride and tellurite-based optical amplifiers provide levels of amplification that are not possible with silica-based amplifiers. Praseodymium-doped fluoride fiberamplifiers can operate in the 1.3 band, which is beyond the scope of practical optical amplifiers. Erbium-doped fluoride fiber amplifiers exhibit a flat spectral gain without the need for a gain equalizer and offer several advantages when used in WDM transmission systems. Erbuim-doped tellurite fiber amplifiers have an ultra-broad gain bandwidth of ~80nm and also allow the channel numbers of WDM systems to be increased. NEL is proud to offer these novel optical fiber amplifiers and in the process make a contribution to the evolution of optical communication technology.   Designed for WDM systems, our athermal arrayed-wavelength grating (AWG) can combine and split optical signals of different wavelengths without using a temperature control device and without a source of electrical power.Conventional AWGs consist of lightwave circuits made of quartz glass waveguides. The index of refraction of quartz glass, however, changes depending upon temperature, which means that the wavelengths of transmitted light also change. To prevent this, a separate temperature control device had to be used. Our athermal AWG solves this problem by using a special silicon resin in part of the lightwave circuit that has a different temperature coefficient than quartz glass. This design cuts the temperature dependence of the wavelengths of transmitted light to less than one-tenth of its original value, which makes using a temperature-control device unnecessary.   Designed for WDM systems, our athermal arrayed-wavelength grating (AWG) can combine and split optical signals of different wavelengths without using a temperature control device and without a source of electrical power.Conventional AWGs consist of lightwave circuits made of quartz glass waveguides. The index of refraction of quartz glass, however, changes depending upon temperature, which means that the wavelengths of transmitted light also change. To prevent this, a separate temperature control device had to be used. Our athermal AWG solves this problem by using a special silicon resin in part of the lightwave circuit that has a different temperature coefficient than quartz glass. This design cuts the temperature dependence of the wavelengths of transmitted light to less than one-tenth of its original value, which makes using a temperature-control device unnecessary.   Planar lightwave circuits (PLCs) are based on silica waveguide technology and underpin the stability and reliability of the high-performance Mach-Zehnder interferometer.   NEL's 8x8 optical matrix switch employs Mach-Zehnder interferometer with thermo-optic phase shifter as switching unit. Thermo-Optic switch is featured by smaller package and lower power consumption than mechanical switch or O/E-SW-EO switch. This switch can be driven by +5V TTL-level voltage.   Rare-earth-doped fluoride, tellurite and silica fibers realize broadband incoherent light sources operating in the 1.3 to 1.6 wavelength region. They are applicable to the evaluation of WDM optical components, optical low coherence reflectometers and optical sensing systems   Integrated multi channel attenuators for DWDM channel Level controlusing planar Lightwave circuit Mach-Zehnder Interferometers with thermo-optic phase shifters.       The arrayed fiber device is a key component for assembling PLC device.this component is composed of a number(N) of signal mode fibers(N=1,2,4,8,FT-1,2,4,8),a glass plate with V-grooves and a flat glass plate.The standard spacing between the arrayed fiber is 250 . Several types of fiber are available for this component including standard single-mode fiber, dispersion-shifted single-mode fiber,tape fiber,PANDA fiber. These highly reliable arrayed fibers make it easy to fabricate PLC modules.