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    <element id="AAOI_USBankLoansMember" name="USBankLoansMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ChinaBanksMember" name="ChinaBanksMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_TaiwanMember" name="TaiwanMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_PriorPlansMember" name="PriorPlansMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_Plan1998Member" name="Plan1998Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_Plan2000Member" name="Plan2000Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_Plan2004Member" name="Plan2004Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_Plan2006Member" name="Plan2006Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_TaiwanBanksMember" name="TaiwanBanksMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_CiscoSystemsMember" name="CiscoSystemsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_AmazonMember" name="AmazonMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_BiogenomicsMember" name="BiogenomicsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_PreferredStockWarrantsMember" name="PreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_CableTelevisionMember" name="CableTelevisionMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_InternetDataCenterMember" name="InternetDataCenterMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_FiberToTheHomeMember" name="FiberToTheHomeMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_OtherMarketsMember" name="OtherMarketsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_CiscoSystemsIncMember" name="CiscoSystemsIncMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_BiogenomicsCorpMember" name="BiogenomicsCorpMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_LineOfCredit4Member" name="LineOfCredit4Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RangeOneMember" name="RangeOneMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RangeTwoMember" name="RangeTwoMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ForeignAccountsMember" name="ForeignAccountsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ShortTermLoanWithShareholdersMember" name="ShortTermLoanWithShareholdersMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_Plan2013Member" name="Plan2013Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_TenCustomersMember" name="TenCustomersMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_FiveCustomersMember" name="FiveCustomersMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_LineOfCredit5Member" name="LineOfCredit5Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RangeThreeMember" name="RangeThreeMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RangeFourMember" name="RangeFourMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RangeFiveMember" name="RangeFiveMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RangeSixMember" name="RangeSixMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_CashPaidFor" name="CashPaidFor" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ShortTermLoanWithShareholdersAbstract" name="ShortTermLoanWithShareholdersAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_MajorCustomersAbstract" name="MajorCustomersAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_NumeratorAbstract" name="NumeratorAbstract" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_DenominatorAbstract" name="DenominatorAbstract" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_NetIncomeLossPerShare" name="NetIncomeLossPerShare" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_C.EarningsPerShareDetailsPotentiallyDilutiveSharesAbstract" name="C.EarningsPerShareDetailsPotentiallyDilutiveSharesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_CurrencyDomain" name="CurrencyDomain" abstract="true" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_NumberOfShares" name="NumberOfShares" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ExercisePrice" name="ExercisePrice" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_WeightedAverageRemainingContractualLifeAbstract" name="WeightedAverageRemainingContractualLifeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_AggregateIntrinsicValueAbsract" name="AggregateIntrinsicValueAbsract" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_FairValuePolicyTextBlock" name="FairValuePolicyTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
</schema>
