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为了满足陆地导航系统在经济方面的要求，很有必要进一步降低光纤陀螺仪的成本。过去我们一直重视开环、最小配置的接头数目和改进元件。现在我们取消了非基本元件和非基本接头。源－探测器耦合器并不属于Ｓａｇｎａｃ干涉仪的一部分。它被单独用于提供宽频带光源与隔离各个探测器。许多商用激光二极管结合了一个背－面（ｂａｃｋ－ｆａｃｅｔ）光探测器，以监视激光功率。穿过激光器从Ｓａｇｎａｃ干涉仪返回的信号经过激光器，并被这个光探测器接收。通过偏移调制将这些信号与激光器的信号区别开。用这种方式配置的陀螺仪省去了一个直接耦合器和分离的光探测器，并使一个全光纤陀螺仪里最多省去了３个光纤接头。已经将这一原理运用于改进开环光纤陀螺仪的生产。仅仅有２个光纤接头构成的陀螺仪其性能与传统的最小配置相当。
In order to meet the economic requirements of land navigation systems, it is necessary to further reduce the cost of fiber optic gyroscopes. In the past we have always attached importance to open-loop, minimum number of connectors and improved components. Now we have canceled non-basic components and non-basic joints. Source-detector couplers are not part of the Sagnac interferometer. It is used alone to provide broadband light sources and isolate individual detectors. Many commercial laser diodes incorporate a back-facet photodetector to monitor laser power. The signal returned from the Sagnac interferometer through the laser passes through the laser and is received by this photodetector. These signals are differentiated from the laser signals by offset modulation. A gyroscope configured in this way eliminates the need for a direct coupler and separate photodetector and eliminates the need for up to three fiber optic connectors in an all-fiber gyro. This principle has been applied to improve the production of open-loop fiber optic gyroscopes. A mere gyroscope with just two fiber optic connectors offers the same performance as a traditional minimum.