求翻译：Coupler+2WDM 3X2器件是利用带宽拓展技术，使其分路器带宽拓展到±40nm，使其WDM带宽拓展到±20nm而且在这个带宽范围内均能满足低附加损耗、低偏振敏感损耗是什么意思？

Coupler +2 WDM 3X2 device is the use of bandwidth expanding techniques to expand the bandwidth splitter to ± 40nm, so WDM bandwidth is extended to ± 20nm and in the bandwidth range can meet the low excess loss, low polarization dependence loss

Coupler WDM 3 + 2 X 2 devices that use of bandwidth expansion connecter server technologies to expand the ±40 nm bandwidth, so that its WDM bandwidth expansion into ±20 nm bandwidth and this can meet within low insertion loss, low polarization sensitive loss

Coupler+2WDM the 3X2 component uses the band width development technology, causes its shunt band width to develop ±40nm, causes its WDM band width to develop ±20nm moreover can satisfy the low stray losses, the low polarization sensitive loss in this band width scope

Coupler+2WDM 3X2 device is the use of the bandwidth expanding technology, expanded its bandwidth to make it tap 40nm, to WDM and expanded its bandwidth to 20nm in this low bandwidth range can meet the additional loss, low polarization dependent loss

Coupler +2 WDM 3X2 device is the use of bandwidth expanding techniques to expand the bandwidth splitter to ± 40nm, so WDM bandwidth is extended to ± 20nm and in the bandwidth range can meet the low excess loss, low polarization dependence loss