Abstract: A multi-function optical measurement device having an optical wavelength and power measurement function, a ferrule/fiber scoping function, and a ferrule/fiber cleaning function includes a path select unit separating an optical signal for transmission and an optical signal for scoping from a ferrule/fiber; a wavelength and power measurement unit measuring a wavelength and a power of the optical signal for transmission from the path select unit; and a ferrule/fiber scoping unit converting an optical signal for scoping from the path select unit into an electrical signal. It is possible to perform a wavelength and power measurement and a ferrule/fiber scoping by one connection. Since a ferrule/fiber cleaning may be additionally included in one measurement device, it is easy to handle and carry an optical measurement device. A time required to perform a work using an optical measurement device may be reduced.

Abstract: Disclosed are an environmental test chamber having a movable panel and a method of driving the same. The environmental test chamber is used in a thermo-hygrostat, a thermostat, and a high temperature-low temperature tester. The chamber body includes a test cavity in which an object is disposed. An air-conditioning unit conditions the air inside the test cavity, thereby controlling a condition of the test cavity. A movable panel is accommodated in the chamber body to decrease or increase a volume of the test cavity. The efficiency of the chamber is enhanced, and the cost and space required for installing additional equipment is reduced.

Abstract: Disclosed are an environmental test chamber having a movable panel and a method of driving the same. The environmental test chamber is used in a thermo-hygrostat, a thermostat, and a high temperature-low temperature tester. The chamber body includes a test cavity in which an object is disposed. An air-conditioning unit conditions the air inside the test cavity, thereby controlling a condition of the test cavity. A movable panel is accommodated in the chamber body to decrease or increase a volume of the test cavity. The efficiency of the chamber is enhanced, and the cost and space required for installing additional equipment is reduced.

Abstract: A light signal generating apparatus including an erbium-doped optical fiber is provided. The signal light generating apparatus includes a optical fiber which is a gain medium, a light source to emit pump light, a stabilizing unit to compensate for changes of a mean wavelength of the signal light with respect to temperature change in the optical fiber to thereby stabilize the mean wavelength of the signal light, and an optical coupler to transmit the pump light from the light source to the optical fiber and to output signal light returning from the optical fiber and signal light returning from the optical fiber via the stabilizing unit by which the single light is stabilized. Accordingly, the apparatus can lower the change of the mean wavelength with respect to temperature and lower a pump power required of the pump light source.