Jammed-array wideband sawtooth (JAWS) filter has periodic multi-chan nel sawtooth spectrum.Due to the complex spectral components,it′s difficult to make a passive multi-channel sawtooth f ilter.In this article,we present a modified JAWS filter with low loss.It only consists of four elements,including a fiber collimat or,tw o lenses and a virtually-imaged phased array (VIPA).The beam transmitted through the VIPA is collected by a lens and a large area photod etector rather than a mirror is used to reflect the beam back into the fiber.The extra insertion loss is lower than 6dB and the performa nce of the filter is much better than that of the JAWS filter with beam reflected by a mirror.The main characteristics of the jammed- array wideband sawtooth filter based on a virtually-imaged phased array are studied systematically.The main para meters,such as linearity,duty cycle and signal-to-noise ratio,are optimized by numerical simulation and tested by the exp eriment.Since the free spectrum range of the filter is decided by the thickness of VIPA,the optimization of VIPA with different thickn esses is also discussed.The filter might be used in fast sensitive interrogation of concatenated multi-channel fiber Bragg grating senso rs and ultra-high-frequency electrical sawtooth waveform generation.