公开(公告)号：JPH07270730A

公开(公告)日：1995-10-20

申请号：JP8771995

申请日：1995-03-22

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： HAINTSUUKURISUTOFU NAITSUERUTO ,  DOMENIKO KAMUPI

IPC: G02F1/015 ,  G02F1/017 ,  G02F3/02

Abstract: PURPOSE: To suitably execute a complicated logic by including a guide zone which consists of a series of layers that are alternately changed between a quantum well and a barrier layer and sending parallelly luminous radiation to be processed to the layers in quantum well modulators where an electro- optical modulator makes a pair. CONSTITUTION: A pair of quantum well modulators M are applied reverse bias by a variable voltage source U through a load impedance Z, a light beam Fi is entered into a guide zone by an optical system L1 and a light beam Fo which is collimated by an optical system L2 is taken out. The impedance Z sets an operating point of the modulators M which are equal to a PIN diode and brings about a positive feedback. An luminous radiation absorption coefficient is reduced by an operational wavelength. As backward direction applied voltage increases, photocurrent which crosses the modulators M decreases, voltage drop in the impedance Z is decreased and the increase of backward applied voltage is brought about. A desired transfer function Po/Pi can be selected by changing voltage of a variable generator U.