Phase of all fiber make the delay interferometer and its production mannered null optical

摘要

The delay interferometer device, and its production method phase of all fiber make being controlled are disclosed. This device is suitable in especially optical DPSK recovery use. This device includes two optical fiber couplers, each one has two input ports and two output ports, possesses two branches of equal length between the couplers. The said coupler has nearly 50% divided ratio in the operation wave length territory of the device. As for two branches between the couplers during two branching, shape it is done in the kind of form which offers the lag of 1 bits, in addition in order to offer the compact device, shape it is done. In addition two branches form in order to make the double refraction in the device smallest. Furthermore in order to heat the branch of longer one, the fiber heater is offered, obtains the phase control of interference shape. Also production method of that kind of device is offered.