Abstract: A pigment composition composed of 50 to 95% by weight of a phthalocyanine, 1 to 45% by weight of a halogenated phthalocyanine of which the number of substituents of a halogen atom is 1 to 9 and the average number of the substituents is 2.0 to 4.0 and 0.1 to 10% by weight of a phthalocyanine derivative of the formula (1) or a phthalimide methylated phthalocyanine derivative, a colorant containing the above pigment composition and a molded article obtained from a plastic containing the above colorant, P—(X)m??(1) wherein P represents a phthalocyanine structure, X represents an alkyl group having 12 to 18 carbon atoms, an alkoxy group having 12 to 18 carbon atoms, —SO2NHR, —SO2NR2, —NR2, —CONR2, —CONHR or —SR (wherein R represents an alkyl group or an alkenyl group which has 12 to 18 carbon atoms), and m is an integer of 1 to 4.

Abstract: A pigment composition composed of 50 to 95% by weight of a phthalocyanine, 1 to 45% by weight of a halogenated phthalocyanine of which the number of substituents of a halogen atom is 1 to 9 and the average number of the substituents is 2.0 to 4.0 and 0.1 to 10% by weight of a phthalocyanine derivative of the formula (1) or a phthalimide methylated phthalocyanine derivative, a colorant containing the above pigment composition and a molded article obtained from a plastic containing the above colorant, P-(X)m??(1) wherein P represents a phthalocyanine structure, X represents an alkyl group having 12 to 18 carbon atoms, an alkoxy group having 12 to 18 carbon atoms, —SO2NHR, —SO2NR2, —NR2, —CONR2, —CONHR or —SR (wherein R represents an alkyl group or an alkenyl group which has 12 to 18 carbon atoms), and m is an integer of 1 to 4.

Abstract: A resistor is connected in series with a vertical cavity surface emitting laser, and DC bias electric current is supplied thereto from a DC bias electric current supplying circuit by way of an inductor. Input data is inputted from a differential input line to a voltage amplifier by way of a PECL input buffer, for voltage amplification. The amplified signal is attenuated by an attenuator, transferred to a transfer line by way of a capacitor for AC coupling, and applied to the series resistance and the vertical cavity surface emitting laser. The voltage amplifier has a peak in its frequency characteristics and is structured such that the gain, the frequency band, and the peaking characteristics can be adjusted.

Abstract: A resistor is connected in series with a vertical cavity surface emitting laser, and DC bias electric current is supplied thereto from a DC bias electric current supplying circuit by way of an inductor. Input data is inputted from a differential input line to a voltage amplifier by way of a PECL input buffer, for voltage amplification. The amplified signal is attenuated by an attenuator, transferred to a transfer line by way of a capacitor for AC coupling, and applied to the series resistance and the vertical cavity surface emitting laser. The voltage amplifier has a peak in its frequency characteristics and is structured such that the gain, the frequency band, and the peaking characteristics can be adjusted.