Interferometer for environment temperature compensation and compensating method thereof

Abstract

The invention provides an interferometer for environment temperature compensation. The interferometer comprises an optical splitter, wherein the optical splitter comprises an optical split film; an incidence beam is split into a first beam and a second beam at the splitting position of the optical split film; the first beam is transmitted by a first interference arm and is reflected to the optical splitter through a first light path, and the second beam is transmitted by a second interference arm and is reflected to the optical splitter through a second light path; the first beam and the second beam are outputted from the optical splitter after the first beam and the second beam are subject to interference at the optical split film of the optical splitter; the incidence beam carries phasemodulation data; the first interference arm is provided with a heater to change the path of the first light path to ensure the difference of the paths of the first light path and the second path is related to the transmission velocity of an optical signal. The interferometer is characterized in that at least one interference arm is provided with a temperature compensator to compensate the phase drift brought by environment temperature. The interferometer has the advantages that drift generated by the environment temperature can be compensated by the temperature compensator, so that the interferometer has a more stable working state.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an interferometer for ambient temperature compensation and a compensation method. Background technique [0002] Optical differential phase-shift keying (DPSK) is a promising modulation format that offers high receiver sensitivity, high tolerance to major nonlinear effects in high-speed transport, and high tolerance to coherent crosstalk. In optical DPSK transmission, The data information is carried by the optical phase between adjacent bits, for direct detection of optical DPSK signals by conventional intensity detectors, a conditioner for transferring the phase-encoded signal into an intensity-encoded signal is required. Such regulators are usually delay interferometers. The interferometer includes two light beams for transmission, and it is hoped that the optical path difference (OPD) between the two light paths has an expected value, but the control of the interferometer ...

AI Technical Summary

Problems solved by technology

The interferometer includes two light beams for transmission, and it is hoped that the optical path difference (OPD) between the two light paths has an expected value, but the control of the interferometer arm length difference is a difficult problem. Due to the purpose of light interference, the optical path difference Change directly affects the interference intensity, however, the optical path of one of the interference arms is longer than the optical path of the other interference arm, therefore, the control of the temperature can ensure the stability of the optical path difference (OPD), but the change of the ambient temperature will Can cause optical path difference (OPD) stability

In order to balance the change of the ambient temperature, there is a U.S. patent US6924894, which is equipped with two heaters and an ambient temperature detector connected to a controller through two-way interference arms, so as to control the heating amount of the heater, thereby balancing the influence of the ambient temperature. The method must eliminate the influence of the ambient temperature through a complex circuit, the cost is high, and the circuit is complicated

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